hh.sePublications
Change search
Refine search result
1234567 51 - 100 of 738
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 51.
    Averfalk, Helge
    Halmstad University, School of Business and Engineering (SET), Biological and Environmental Systems (BLESS), Energiteknik.
    Morgondagens effektiva fjärrvärme: En beskrivande litteraturstudie2014Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report is made as a literature review, focusing on the work done to increase understanding of efficiency in the categories of substations and secondary heating systems, with respect to the deviation from the theoretically possible cooling off in the distribution network as well as the economic benefit that appear. The main purpose of a considerable part of the literature used in this report addresses the issue of identifying individual causes of reduced cooling in district heating systems. These literature resources have been compiled and summarized as part of the report.

    The technology of district heating is associated with benefits such as better use of the energy in a fuel. This is the case of cogeneration plants where serial generation of electricity and thermal energy increases efficiency compared with the parallel generation where heat is generated locally and electricity is generated centrally. Serial generation thus allows for lower primary energy demand. Another benefit from combustion in units with higher capacity installed is that a higher control of emission with environmental impact is permitted. Additionally local environment change drastically when a few large supply units replace a large number of local supply units. It has also been shown that district heating can reduce greenhouse gas emissions in a cost efficient way. Thus being a part of the energy system to achieve the EU climate goals

    In Sweden, district heating is developed to a high degree. In connection with decreasing focus on expansion, the focus on maintenance and optimization and how district heating should look like in the future increases. In conjunction with lower heat demand from new and renovated buildings distribution cost will increase. For district heating to maintain competitiveness a development in distribution technology that move toward the next generation of distribution technology is necessary. Average temperatures today in Swedish district heating systems are for supply water 86 ° C and for return water 47 ° C. In the future temperature levels could decrease to current with temperatures down against 55 ° C supply temperature and 25-20 ° C return temperature. The latter system temperature levels moves towards the ideal possible.

    It is possible to distinguish four generations of district heating distribution technology. The differences between generations are essentially depending on temperature levels but also depend on state of matter. The first generation district heating used high-temperature steam for heat transfer and then the newer distribution technologies resulted in lower temperatures and change of phase, from gas to liquid. The third generation of district heating distribution technology meant lower temperature than the second generation, and likewise the fourth generation will have a lower temperature level than the third-generation distribution technology for district heating. The development is driven by the benefits of lower temperature levels. One of the more appealing benefits of lower supply temperature is the possibility to use low exergy heat, resulting in reduced need of primary energy. The potential heat sources where increased heat supply with lower system temperatures becomes available can be seen in the four next bullets.

    • Waste heat
    • Geothermal heat
    • Solar heat
    • Heat pump

    Other advantages obtained with lower temperature levels in heat distribution are.

    • Lower distribution losses
    • Higher electrical power efficiency in CHP
    • Increased efficiency in flue gas condensation
    • Increased capacity in the distribution network
    • Reduced need for pump power in the distribution network
    • Lower risk of serious scalding
    • Increased capacity in heat storage
    • Ability to use other materials for distribution at lower cost

    There seem to be a consensus in the literature that lower temperature levels in district heating systems are a desirable change. The reason for this is likely that there are mostly advantages of lower temperature levels. The drawbacks of lower temperature levels are negligible which make the risk of investment low.

    Download full text (pdf)
    fulltext
  • 52.
    Averfalk, Helge
    et al.
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Dalman, Bengt-Göran
    BG Dalman AB, Göteborg, Sverige.
    Kilersjö, Christer
    EKSTA, Kungsbacka, Sverige.
    Lygnerud, Kristina
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS). IVL Svenska Miljöinstitutet, Stockholm, Sverige.
    Welling, Sebastian
    IVL Svenska Miljöinstitutet, Stockholm, Sverige.
    Analys av 4e generationens fjärrvärmeteknik jämfört med 3e generationens: Simulering av sekundärnät i nybyggnationsområde2017Report (Other academic)
    Abstract [sv]

    Bakgrunden till studien är att nya förutsättningar genom energieffektivisering, konkurrens från värmepumpar och nya krav på kundsidan gör en modernisering av fjärrvärmeverksamhet nödvändig. En del av denna modernisering är att kunna dra nytta av de fördelar som lägre temperaturer i näten medför. Därtill skapas genom den nya tekniken förutsättningar för att ta hand om värmekällor som idag inte utnyttjas (t.ex. värme från kylprocesser och annan infrastruktur såsom värme från avloppsvatten och värme från kollektivtrafik).

    Befintlig teknik är beprövad och bygger på att det finns ekonomiska incitament att förbränna biobränsle och avfall. Steget till att pröva en ny teknik där andra värmekällor och en ny gränsdragning gentemot kund blir nödvändig är därför stort och förenat med ett antal frågor. Det är just de frågor som uppkommer i ett fjärrvärmeföretag inför implementering av 4e generationens fjärrvärmeteknik som projektet försöker identifiera. Det blir dock så att enbart en del av frågorna besvaras genom att studien har ett avgränsat fokus. Fokus är på jämförelse mellan ett 3GDHtvårörsystem och ett 4GDH-trerörsystem i ett sekundärnät i ett nybyggnationsområde.

    I projektet simuleras hur utfallet blir för olika parametrar om man hade valt att implementera 4e generationens teknik istället för 3e generationens teknik.

    Resultaten påvisar att:

    • 4e generationens lösning ökar energieffektiviteten i byggnader, detta främst genom att behovet av varmvattencirkulation försvinner.• Beaktas enbart distributionsförluster i näten så är 4e generationen mer effektiv än 3e generationen.• Genom lägenhetsväxlaren i 4e generationens lösning så elimineras risken för Legionella helt. En möjlig barriär för 4e generationens teknik består dock i att boverkets byggregler inte är konstruerade för att varmvattencirkulation inte finns.• Lägenhetsväxlarna innebär en kostnad per lägenhet vilket begränsar lösningens kostnadseffektivitet jämfört med en större värmeväxlare i fastighetens bottenplan. Idag är 4e generationens teknik lämpad för fastigheter med 10-15 lägenheter, är det fler lägenheter blir 4e generationens lösning dyrare än den konventionella 3e generationens lösning.• En viktig aspekt med 4e generationens lösning att värmeförlusten från huset förflyttas från fastighetsägaren till fjärrvärmeföretaget, genom att värmeleverans sker till varje lägenhet och inte vid husvägg. Initialt kan sådan börda på fjärrvärmeföretaget verka negativ med avseende på kostnad. Diskussionerna i projektet mynnade ut i att parterna enas om att affären blir mer rättvisande och att fastighetsägaren får ökad insyn i värmeförbrukningen vilket, med rätt affärsmodell, kan skapa ökat förtroende och en möjlighet att dela på förlusten mellan de två parterna.

    Projektet har omfattat löpande dialog med EKSTAs VD vilket varit värdefullt för att skapa förståelse kring fastighetsägarens perspektiv och frågor rörande 4e generationens teknik. Därtill har en workshop med EKSTAs driftspersonal hållits för att diskutera relevansen i de resultat som tagits fram. I projektet ingår BengtGöran Dalman med över 35 års erfarenhet av fjärrvärmeverksamhet vid Göteborg Energi. Projektets verklighetskoppling leder till slutsatsen att det inte föreligger någon särskild driftsproblematik för implementering av 4e generationens system.

    Som en egen del i projektet uppmärksammas den diskussion som förs i branschen kring möjligheten att dra nytta av billig el, främst under perioder då det blåser mycket och det blir ett överskott av el i elnätet. I studien analyseras möjligheten att inte använda en konventionell pelletspanna som tilläggsvärmekälla utan en eldriven panna. Resultaten visar att med dagens styrning genom skatter och avgifter så är det inte möjligt att dra nytta av att det förekommer perioder med mycket lågt elpris. Rådande regelverk stödjer istället installationer såsom pelletspannor.

    © ENERGIFORSK

  • 53.
    Averfalk, Helge
    et al.
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Ottermo, Fredric
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Werner, Sven
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Pipe Sizing for Novel Heat Distribution Technology2019In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 12, no 7, article id 1276Article in journal (Refereed)
    Abstract [en]

    This paper assesses pipe sizing aspects for previously proposed, novel, low heat distribution technology with three pipes. Assessment issues include heat loss, pressure loss, and pipe sizing for different typical pipe configurations. This assessment has been provided by the analysis of a case area with single-family houses. Concerning heat loss, the proposed three-pipe solutions have the same magnitude of heat loss as conventional twin pipes, since lower return temperatures compensate for the larger heat loss area from the third pipe. Regarding pressure loss, the main restriction on the size of the third pipe is limited to the pressure loss in the third pipe. Thermostatic valves to manage the flow rate of the third pipe are advocated, since alternative small pumps have not been found to be commercially available. The pipe sizing recommendation is that the third pipe for recirculation purposes can be two to three standard pipe sizes smaller than the corresponding supply and return pipe, if no prosumer is connected in the heat distribution network.

    Download full text (pdf)
    Pipe Sizing for Novel Heat Distribution Technology
  • 54.
    Averfalk, Helge
    et al.
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Werner, Sven
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Economic benefits of fourth generation district heating2020In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 193, article id 116727Article in journal (Refereed)
    Abstract [en]

    The main impetus for lower distribution temperatures in district heating systems is the lower heat supply costs obtained by these lower temperatures. In this paper, the differences in heat supply costs for two different temperature levels have been estimated for various future heat supply options. The estimations were obtained by modelling a district heating system characterised by typical climate conditions for Central Europe. High sensitivity to lower supply costs from lower temperatures was found for geothermal heat, industrial excess heat, and heat pumps, whereas low cost sensitivity was estimated for combined heat and power plants using waste or biomass. Lower heat distribution loss constitutes a minor component of the total cost reductions. The current use of high heat distribution temperatures was identified as an important barrier for the transition to renewable and recycled heat supply in district heating systems. Hence, lower distribution temperatures would facilitate this required transition because lower distribution temperatures provide higher profitability for these renewable and recycled heat sources. © 2019 The Authors. Published by Elsevier Ltd.

  • 55.
    Averfalk, Helge
    et al.
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Werner, Sven
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Efficient heat distribution in solar district heating systems2018In: SDH Solar District Heating: Proceeding, 2018, p. 63-66Conference paper (Refereed)
    Abstract [en]

    This paper contains a short analysis showing the main benefit for solar district heating when a novel heat distribution concept with low temperatures is applied. The analysis is performed by comparing the annual solar heat output from a solar collector field for current heat distribution temperatures in Sweden with the corresponding output for the novel heat distribution concept. The results show that the new low temperature concept provides 66% more solar heat for a typical solar collector. Hereby, the solar collector field can be reduced with 40%, giving a corresponding cost reduction for solar heat generated. Another result is that the cost gradient for lower costs from lower return temperatures is five times higher for solar district heating compared to current heat supply in Swedish district heating systems. One major conclusion is that high heat distribution temperatures in current European district heating systems are a major barrier for the competitiveness of solar district heating.

    Download full text (pdf)
    fulltext
  • 56.
    Averfalk, Helge
    et al.
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS).
    Werner, Sven
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Energy Science.
    Essential Improvements in Future District Heating Systems2016In: Proceedings of the 15th International Symposium on District Heating and Cooling: September 4th - 7th, 2016, Seoul, South Korea / [ed] Rolf Ulseth & Kyung Min Kim, 2016, p. 194-200Conference paper (Refereed)
    Abstract [en]

    The major common denominator for future efficient fourth generation district heating systems is lower temperature levels in the distribution networks. Higher efficiencies are then obtained in both heat supply and heat distribution. Heat supply becomes more efficient with respect to combined heat and power, flue gas condensation, heat pumps, geothermal extraction, low temperature excess heat, and heat storage. Heat distribution becomes more efficient from lower distribution losses, less pipe expansion, lower scalding risks, and plastic pipes. The lower temperature levels will be possible since future buildings will have lower temperature demands when requiring lower heat demands. This paper aims at providing seven essential recommendations concerning design and construction strategies for future fourth generation systems. The method used is based on a critical examination of the barriers for lower temperature levels and the origins of high return temperatures in contemporary third generation systems. The two main research questions applied are: Which parts of contemporary system design are undesirable? Which possible improvements are desirable? Key results and the corresponding recommendations include temperature levels for heat distribution, recirculation, metering, supervision, thermal lengths for heat exchangers and heat sinks, hydronic balancing, and legionella. The main conclusion is that it should be possible to construct new fourth generation district heating networks according to these seven essential recommendations presented in this paper.

    Download full text (pdf)
    fulltext
  • 57.
    Averfalk, Helge
    et al.
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Werner, Sven
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Essential improvements in future district heating systems2017In: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 116, p. 217-225Article in journal (Refereed)
    Abstract [en]

    The major common denominator for future efficient fourth generation district heating systems is lower temperature levels in the distribution networks. Higher efficiencies are then obtained in both heat supply and heat distribution. Heat supply becomes more efficient with respect to combined heat and power, flue gas condensation, heat pumps, geothermal extraction, low temperature excess heat, and heat storage. Heat distribution becomes more efficient from lower distribution losses, less pipe expansion, lower scalding risks, and plastic pipes. The lower temperature levels will be possible since future buildings will have lower temperature demands when requiring lower heat demands. This paper aims at providing seven essential recommendations concerning design and construction strategies for future fourth generation systems. The method used is based on a critical examination of the barriers for lower temperature levels and the origins of high return temperatures in contemporary third generation systems. The two main research questions applied are: Which parts of contemporary system design are undesirable? Which possible improvements are desirable? Key results and the corresponding recommendations include temperature levels for heat distribution, recirculation, metering, supervision, thermal lengths for heat exchangers and heat sinks, hydronic balancing, and legionella. The main conclusion is that it should be possible to construct new fourth generation district heating networks according to these seven essential recommendations presented in this paper. © 2017 The Authors. Published by Elsevier

    Download full text (pdf)
    fulltext
  • 58.
    Averfalk, Helge
    et al.
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Werner, Sven
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Framtida fjärrvärmeteknik: Möjligheter med en fjärde teknikgeneration2017Report (Refereed)
  • 59.
    Averfalk, Helge
    et al.
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Werner, Sven
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Novel low temperature heat distribution technology2018In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 145, p. 526-539Article in journal (Refereed)
    Abstract [en]

    Lower future heat demands and lower availability of non-fossil high temperature heat supply are expected future market conditions that restrain the long-term viability of contemporary district heating systems. Hence, current district heating technology should be enhanced to increase system performance in new heat distribution areas. This paper aims to outline a proposal for technical improvements required to achieve lower annual average return temperatures in new residential buildings to improve viability in future market conditions. The proposed technical solution consists of three principle changes: three-pipe distribution networks, apartment substations, and longer thermal lengths for heat exchangers. The three technical modifications aims at addressing system embedded temperature errors. Furthermore, a simulation model was developed to assess the proposed technical solution concerning different energy performances of buildings and different thermal lengths in heat exchangers. The results show that implementation of the three technical modifications reaches time-weighted annual average return temperatures of 17–21 °C with supply temperatures of about 50 °C. The results also verify the increased necessity to separate the network return flows into delivery and recirculation flows in residential substations as energy performance in buildings increase.

  • 60.
    Averfalk, Helge
    et al.
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Werner, Sven
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Felsmann, Clemens
    Technische Universität Dresden, Dresden, Germany.
    Rühling, Karin
    Technische Universität Dresden, Dresden, Germany.
    Wiltshire, Robin
    Building Research Establishment (BRE), Garston, Watford, United Kingdom.
    Svendsen, Svend
    Technical University of Denmark, Kongens Lyngby, Denmark.
    Li, Hongwei
    Technical University of Denmark, Kongens Lyngby, Denmark.
    Faessler, Jérôme
    University of Geneva, Geneva, Switzerland.
    Floriane, Mermoud
    University of Geneva, Geneva, Switzerland.
    Quiquerez, Loïc
    University of Geneva, Geneva, Switzerland.
    Transformation Roadmap from High to Low Temperature District Heating Systems: Annex XI final report2017Report (Other academic)
    Download (pdf)
    summary
  • 61. Axell, Johan
    et al.
    Eriksson, Oliver
    Solcellsprojektering - Blomsterlandet: Beräkning och simuleringsstudie av en solcellsanläggning för optimering av hög andel egenanvänd el2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Download full text (pdf)
    fulltext
  • 62.
    Axelsson, Emil
    et al.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Källner, David
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Plastgranulat Extruder2016Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Download full text (pdf)
    fulltext
  • 63. Axelsson, Frida
    et al.
    Ölmén, Henrik
    Effektivisering och förbättring av produktionslinje2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The thesis is done at Kvibille dairy and includes the design of a packing line for blue cheese.

    Today ́s line has a maximum production capacity of two tons per day, based on the fact that there are three employees at the line. The production includes three separateflavors to be packaged. The line has a high degree of manual labor and is considereddifficult to handle and not very ergonomic according to the staff on the production line. The goal for this thesis is to improve the ergonomic aspects of the line and if possible reduce the need for personnel without adventuring the production capacity.

    To find what improvements can be made on the line, a preliminary and background study was made. These studies include interviews, observations in the form of a Rapid Plant Assessment, time measurements and simulations. The study showed that the personnel felt some stress during the line and that the flow stops at several stations which impede the flow. The advantage is that the line is flexible and all the stationsin the line are oriented in the right order.

    After all the facts were collected and it was determined what was needed for the line, the search for suppliers began. What was needed was an adjustable table and fatigue mats to improve working conditions. Automation was also investigated to minimize the stress on the staff. The automation idea was later replaced with manually controlled aids and semi-automatic machines because it was considered more cost effective. To streamline the line, automatic scales with label applicators wereinvestigated and alternative packaging methods. These methods involved replacing the material on the foil so that the need for plastic wrapping is eliminated.

    The result was to replace the tables for height adjustable workbenches and introduce a vacuum lift to improve ergonomics on the line. The aluminum foil is replaced by a more durable wax laminated foil called DanaPhane with an integrated name label in the foil, eliminating the need for plastic foil and separate labels. Because the need for these is eliminated, environmental impact is minimized in terms of material utilization and transports. The elimination also means fewer operations, which reduces the need for additional staff. To further streamline the production, an automated scale and weight labeling for each cheese was introduced.

    Download full text (pdf)
    fulltext
  • 64.
    Axenskär, Christian
    et al.
    Halmstad University, School of Business and Engineering (SET).
    Winde, David
    Halmstad University, School of Business and Engineering (SET).
    Automatic Trimmerhead2012Independent thesis Basic level (university diploma), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    Automatic trimmerhead is an examination project for making an automatic trimmerhead for grass trimmers with the user and functionality in focus. Our perception is that a happy user is a user who can pick up his or her trimmer, use it and put it back to its place when the job is done. It should not be necessary to interrupt work and perform maintenance on the machine just to make it work as promised.

    The project has been made in collaboration with the company Husqvarna, which is one of the biggest actors dealing with garden machinery on the market. Together we determined the project goal, “To invent, construct and test a brand new concept for how an automatic trimmerhead can look and function”.

    At this day there are several different automatic trimmerheads on the market, both semi and fully automatic. After having seen and tested many of these trimmerheads, we have come to the following conclusion. They are either difficult for users to handle or has unreliable functions, sometimes both. We have, with this kept in mind, tested and analyzed the different models to find the problem. We found one, and maybe the only, reason to why these trimmerheads does not function as promised. All the trimmerheads functions are based on the increased rotation speed that will occur when the cord breaks off.

    In our product we have therefore designed a mechanical solution that feed cord based on not only the force affecting the cord but also on the length of the cord. A trimmerhead with a cord feeding function which can activate based on the length of the cord does not exist on the market and is according to Husqvarna, who has much knowledge on the subject, a new and very interesting way of solving the problem.

     Since the beginning of the project we have had many ideas and surely we have encountered even more problems, but this is what has given us the knowledge we needed to make it to where we are today. The result of this is a brand new concept with good patent possibilities on several parts and functions which have given Husqvarna everything they need to continue the work and to turn our solution into a high quality product. 

    Download full text (pdf)
    Automatic trimmerhead
  • 65.
    Ayed, Sami
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Energy Science.
    Assessment of energy losses for the climate shell in a commercial passenger ship2015Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The shipping industry is facing a major challenge. Current and future emission requirements result in considerably increased operating costs. Studies have shown that it is a large potential to reduce the ship operating costs by energy effectivisation. The focus has naturally been on systems with major energy losses, such as combustion engines, propulsion and hull friction.

    A passenger ship like Stena Danica with a big climate controlled accommodation could be expected to have major heat losses. By calculating transmission losses from walls, ceilings, window sections, and the energy losses by ventilation, a general view of how heat losses are distributed has been established. The primary goal is to gather information that could be useful in further energy improvements.

    Due to lack of information and deficiently measured data have several assumptions and simplifications been made. Despite this, the calculations can be considered as indicative. The results indicated that about 50 percent of the energy losses occur by ventilation and the remaining consists of transmission losses in windows sections and climate shell, (About 25% each). The focus in the calculations has been to estimate the accommodations heating demand. Energy improvements that reduce the heating demand will reduce the cooling demand as well. This may be a greater incentive for measures as the air conditioning system are powered with higher energy quality; electricity. Besides shore power the electricity is mainly generated by diesel generators. The energy used for heating is mainly produced by waste heat or is supplied by shoreside district heating.

    Upgrading the ventilation systems are considered to be the most economic method to reduce the heat losses in the accommodation area. The ship's ventilation systems lack any type of demand control, this causes excessive energy losses as the ventilation demand vary greatly regarding to time of the day and numbers of passengers.

    The ship has a large amount of single pane windows that also contributes to large energy losses. To upgrade or replace these are considered to be more economic than to improve the insulation on the rest of the climate shell as it doesn’t affect the interior to the same extent. The latter may be worth considering in case of a major renovation of the vessel.

  • 66.
    Baerveldt, Albert-Jan
    et al.
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Salomonsson, Tommy
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Åstrand, Björn
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
    Vision-guided mobile robots for design competitions2003In: IEEE robotics & automation magazine, ISSN 1070-9932, E-ISSN 1558-223X, Vol. 10, no 2, p. 38-44Article in journal (Refereed)
    Abstract [en]

    The use of popular and effective robot-design competitions in teaching system integration in engineering curricula was discussed. Such robot competitions give students open-ended problem spaces, teaches them to work in groups and stimulates creativity. The technical and pedagogical aspects of robot competitions along with their experiences and shortcomings were also discussed.

    Download full text (pdf)
    FULLTEXT01
  • 67.
    Bangalore Manjunath, Harsha
    et al.
    Halmstad University, School of Business, Engineering and Science.
    Kumar, Santosh
    Halmstad University, School of Business, Engineering and Science.
    Designing of Kids Train2018Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Designing a Kids Train body and Chassis, where Body of a train plays an important role as it should be attractive, fun, educational, comfortable and safer for the kids. and the chassis should be able to withstand sufficient load and able to accommodate steering, battery, seating, motor, axles and bumper at all sides which is developed for SB international AB.A literature study is carried out to review various designs body of train and chassis, latest innovations and advanced materials used to manufacture the same. The various types of forces and stresses commonly acting on chassis structures are analyzed and their effects on the vehicle is understood and different types of train design is studied in order to make an attractive train for the kids by using Waterfall method to understand the concepts in designing a Train body. The pro-con analysis is conducted to evaluate merits and demerits of each alternative type of body of a train and the material to manufacture it. The most essential 

    design criteria are derived from the QFD (Quality function deployment) which then acts as important guidelines during the actual design process.Structural chassis frame is designed as per the design criteria with little modification and designing a body of a train using the CAD software CATIAV5R20 and the structural stability of the same is tested and analyzed using Inspire (solid thinking) software.

    Download full text (pdf)
    fulltext
  • 68.
    Barth, Henrik
    Halmstad University, School of Business, Engineering and Science, Centre for Innovation, Entrepreneurship and Learning Research (CIEL).
    Fabrication Laboratory as the Learning Environment for Higher Education2019In: The 10th International Multi-Conferences on Complexity, Informatics and Cybernetics. March 12-15, Orlando, Florida, USA: Proceedings Volume II (Post-Conference Edition) / [ed] Nagib Callaos, Heing-Wei Chu, Jeremy Horne, Suzanne K. Lundford, Belkis Sánchez & Michael Savoie, Orlando: International Institute of Informatics and Systemics , 2019, Vol. 2, p. 3p. 194-196Conference paper (Refereed)
    Abstract [en]

    There is a growing trend of using digital production, such as additive manufacturing, in direct consumer markets. Digital production enables new and advanced tools, which provide shorter development time and lower cost for manufacturing. In this paper we focus on the education and learning environment for digital production and prototyping at a fabrication laboratory (FabLab). FabLab (Fabrication Laboratory) is a small-scale innovation space offering digital fabrication and production. A FabLab is, among many things, a platform for learning and exchanging experience when experimenting and developing new solutions. FabLabs bring together students, researchers and teachers as well as industrial partners in a single physical location for the purposes of designing, prototyping, and do-it-yourself manufacturing. This explorative and creative environment provide insights to knowledge creation, based on the constructive learning theory, which address active involvement by the participants. To take full advantage of this creative learning environment, aspects such as student characteristics, the nature of the subject matter, and the teaching carried out by the staff, also needs to be addressed. © 2019 International Institute of Informatics and Systemics

  • 69.
    Barth, Henrik
    Luleå University of Technology, Luleå, Sweden.
    Organisation Structure: A Study of Irish SMEs1998Conference paper (Other academic)
  • 70.
    Barth, Henrik
    et al.
    Halmstad University, School of Business, Engineering and Science, Centre for Innovation, Entrepreneurship and Learning Research (CIEL).
    Holmén, Magnus
    Halmstad University, School of Business, Engineering and Science, Centre for Innovation, Entrepreneurship and Learning Research (CIEL).
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    The use and abuse of 3D-printing from a business model perspective2016Conference paper (Refereed)
    Abstract [en]

    The paper analyses changes in user activities and behaviour across different types of actors following the introduction of 3D printers. 3D printing, or additive manufacturing, has been claimed to disrupt manufacturing, allowing firms to move from prototyping to full-scale end-part production and replacement part production in a one-step process. 3D printing has many different uses, for example, the manufacturing of toys, shoes, lamps and fashion accessories, and by implication many different types of users and buyers. There are few empirical studies on the types of uses and users of 3D, hampering our understanding in what ways the 3D printers may change the behaviour of users, and whether 3D printers affect the likelihood and the nature of entrepreneurship or business model innovation. To investigate this, a model was created based on the 3DP literature. The model is applied on a distributor customer database and four interview-based illustrative case studies. The empirical findings show that the use of 3DP a) lowers the knowledge and resource barriers for experimentation and entrepreneurial entry, b) increases product and concept prototyping in product development, c) provides a potential for business model innovation by expanding the boundaries of the firm upstream and downstream, and d) becomes a ticket for entrepreneurial entry. Based on our results, the paper suggests that the potential of 3D printers alter user innovative activities is high but most of the potential is latent.

  • 71.
    Barth, Henrik
    et al.
    Luleå University och Technology, Luleå, Sweden.
    Hörte, Sven-Åke
    Luleå University och Technology, Luleå, Sweden.
    Growth Stage Models and Organisation Structure in SMEs1998Conference paper (Other academic)
  • 72.
    Bazes, Alex
    et al.
    Halmstad University, School of Business, Engineering and Science.
    Baker, Andrew
    Halmstad University, School of Business, Engineering and Science.
    Redesign of the package tester2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Download full text (pdf)
    fulltext
  • 73. Becevic, Denijel
    et al.
    Persson, Robin
    Cito Systems – Mjukvara i form av ett stödsystem för restaurangbranschen2013Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Download full text (pdf)
    CitoSystems
  • 74.
    Bengtsson, Conny
    Halmstad University, School of Business and Engineering (SET).
    Ersättning av fossilt bränsle i värmeproduktion: Pulverbrännare till befintliga oljepannor2013Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    We are facing a change, to reduce our dependency on fossil fuels in favor of increased use of renewable energy. Incentives in the form of increased excise taxes on fossil fuels for companies accelerate the conversion to renewable energy or energy efficiency of its production. The consequence is a progressively more expensive cost for district heating with fuel oil to manufacturing industry. Excise tax on fuel oil rises by 41 percent, from 2010 to 2015 for those companies. To convert existing oil boilers with woodpowderburner is a solution to keep production costs down and remain competitive. In this thesis studied the possibility of converting oil boilers in the size range of 5 to 10 MW. The study takes a holistic approach to RMT's district heating to search the answer, if it is possible to do a conversion from a technical, sustainability and economic perspective. The felt need for peak load from oil boilers at -3° C appeared not to sue; it ended up at -6° C. The results indicate that a 10 MW oil boiler can be converted to 5 MW wood powder and while retaining its original power through a combination burner. Previously problems with woodpowderplant are taken care of and reference facilities in the current magnitude are in operation. An inquiry was sent out to get budget prices at a conversion of 5 and 10 MW oil boilers for evaluation. Even though all the suppliers was given the same opportunities so varied budget prices very much. A big surprise was the short payoff time on conversions of small oil boilers. The conversion of a 10 MW OP has a payback period of 20 months and that was rather unlikely before the study was performed. This study can also be seen as a source of inspiration to other companies that have small peak load boilers and want to phase out their fossil fuel dependence with renewable energy, and retain their competitiveness. In the district heating sector, these 5 and 10 MW oil boilers are ordinary peak load boilers. There are about 1000 oil boilers in the size from 5 to 10 MW in Sweden so it should be a large potential in converting oil boilers to wood powder

    Download full text (pdf)
    Ersättning av fossilt bränsle i värmeproduktion
  • 75. Bengtsson, Kristoffer
    et al.
    Järvås, Tobias
    Portier2015Independent thesis Basic level (professional degree), 15 credits / 22,5 HE creditsStudent thesis
    Download full text (pdf)
    Portier
  • 76.
    Bengtsson, Niclas
    et al.
    Halmstad University.
    Nilsson, Johan
    Halmstad University.
    Solar Water Pumping for Irrigation: Case Study of the Kilimanjaro Region2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This study has been conducted as a Minor Field Study (MFS). It focuses on solar water pumping for small-scale farmers in the Kilimanjaro Region of Tanzania. The purpose is to investigate the possibilities for rural farmers to operate their irrigation with solar power instead of their current option: fossil fuels, primarily petrol. The study was conducted in three phases, starting with pre-study in Sweden, followed by field study in Tanzania from January to March 2015 and finishing with summarizing and calculating in Sweden. Fuel powered water pumping has a cheap capital cost; however, it is expensive and problematic to maintain and operate. Solar powered water pumping is almost completely opposite. It has a higher initial cost; however, it is considerably cheaper to run. The results indicate that the investment in solar power might be too expensive for the farmers, as long as they do not receive external financial and educational support. Assuming that the farmers are able to obtain a solar water pumping system, results show that they will benefit and save a considerably amount of money over a long period of time. Also, solar water pumping is environmentally friendly compared to the systems in Tanzania today. 

    Download full text (pdf)
    Solar Water Pumping for Irrigation, Bachelor Thesis
  • 77.
    Bengtsson, Per-Johan
    Halmstad University, School of Business and Engineering (SET).
    Autotving: Utveckling av en ny typ av enhandstving2011Independent thesis Basic level (degree of Bachelor), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [sv]

    Då hantverkare jobbar ensamma behövs ofta en extra arm. Dagens enhandstvingar är inte optimala att hantera med endast en hand. I detta projekt har därför ett underlag för en ny typ av enhandstving arbetats fram. Arbetet avgränsades till princip- och primärkonstruktion.Resultatet är en tving som i mycket liknar tvingarna på marknaden idag. Skillnaden är att de båda käftarna dras ihop med hjälp av gummiband innan den slutliga förspänningen sker. För att åstadkomma detta var mekanismen i tvingen tvungen att göras om, samt att designen på tvingen var tvungen att anpassas till de nya komponenterna. Ingen prototyp har byggts, istället har en mycket detaljerad 3d-modell av tvingen arbetats fram.

    Download full text (pdf)
    fulltext
  • 78.
    Bengtsson, Simon
    Halmstad University, School of Business and Engineering (SET), Biological and Environmental Systems (BLESS), Energy Science.
    Economic and environmental implications of a conversion to natural gas.2014Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Download full text (pdf)
    fulltext
  • 79.
    Benyahia, Najat
    Halmstad University, School of Business, Engineering and Science.
    Inverkan på Göteborgs Energi Nät ABs elnät av en ökning av Solcellsanläggningar2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Download full text (pdf)
    fulltext
  • 80.
    Berg, Joakim
    et al.
    Halmstad University, School of Business and Engineering (SET).
    Skog, Per Øyvind
    Halmstad University, School of Business and Engineering (SET).
    Mobil Bastu2012Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    This thesis is an addition to pictures and animation that has been developed using CATIA V5. The animation and the images are a market basis to test whether the product is of interest in the Nordic market. The thesis is structured with elements of the Fredy Olsson method. In this thesis there is also a short presentation of the company Tylö AB, which been chosen to market test the product. A product definition with the sub-headings; “Description and use of product”, “Environmentand users”, “Economy” and “Product inquiry”, are the basis for the product. A list of criteria with conditions and requirements is established. These criteria are then weighted in a matrix. Product ideas are evaluated using the matrix. After defining the criteria and evaluation, a profile is created with a track where woodenpanels and insulation can be fixed upon. This is followed by a design specification which explains details of every component in the product. With this description belongs a matrix in which the product components are classified as finished and special units and also if these require routine or special treatment. Execution of rendering and animation are explained and results are shown with rendered images. The report concludes with a brief conclusion, critical review and suggestions for further work.

    Download full text (pdf)
    fulltext
  • 81.
    Berg, Nichlas
    et al.
    Halmstad University, School of Business and Engineering (SET), Biological and Environmental Systems (BLESS), Energiteknik.
    Kårhammer, Per
    Halmstad University, School of Business and Engineering (SET), Biological and Environmental Systems (BLESS), Energiteknik.
    Säsongslagring av spillvärme: Ersättning av Halmstad fjärrvärmenäts spetslastanläggning2013Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In Sweden, a great deal of energy is used for residential and commercial heating. To fulfill the ever increasingly need for heat, new heating plants is built to complement the district heating system. At the same time there is unused energy in industry, which produces heat as an unwanted byproduct.

    This report evaluates the possibility to use this byproduct to supply energy to a district heating system and store it in seasonal heat storage. When the heat demand increases during the cold season of the year, the seasonal heat storage contributes with heat energy.

    The idea is to replace parts of the heating plants in Halmstad with heat storage and waste heat. The aim is to exclude usage of all fossil fuels. This report will also evaluate the economical prerequisites and environmental benefits in replacing biofuels.

    A steelworks company, Höganäs Halmstadverken, is situated in Halmstad. This industry could contribute with surplus heat, which is calculated in this report.

    With help of calculations and simulations in Microsoft Excel, a system with adequate heat storage method and surplus heat from local industry is formed. This system is optimized concerning economic and environmental matters.

    The results reveal that Halmstad's conditions are favorable to integrate pit heat storage and there is potential to deliver waste heat from Höganäs Halmstadverken steelworks. Sizes of seasonal heat storage is optimized to 200 000 m3 for replacing fossil fuels respectively 550 000 m3 for replacing fossil fuels and biofuels. Waste heat effect is calculated to 15 MW.

    The economical calculations results in an annual profit up to 8 million SEK with a payoff equal to 8 years. The environmental benefits consisting of reduced greenhouse gases are calculated to 4 800 tons carbon dioxide equivalents annually.

    Download full text (pdf)
    fulltext
  • 82.
    Bergkvist, Marcus
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    Åkerblom, Christopher
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    Shooting Target - Konstruktion: Product Development2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The shooting sport is one of the most widespread sports in the world and it is

    being practice in most countries. Based on their own experiences, in competition -

    and hobby shooting, the client M4Solutions found a demand and need for a

    shooting target that is manufactured in Sweden.

    The purpose of the project has been to develop, with the help of Marcus Walldén,

    two shooting targets from idea to finished product. These two shooting targets,

    Plate Rack Target and Dueling Tree, would each be equipped with a mechanical

    resetting system but will in the future have the ability to be provided with an

    electronic resetting system.

    The project from the client was divided into two theses. One of these two, written

    by Marcus Walldén, focused on the tripod parts and the overall design work for

    both Plate Rack Target and Dueling Tree. The thesis that is presented in this

    report have focused on resetting systems, the design of protective plates and other

    peripherals for both shooting targets.

    This work has primarily been in CAD environment where design, construction

    and development has been given free rein. Calculations, test shootings and choice

    of materials has been made in order to reach the best possible solutions. The thesis

    resulted in two complete 3D models and two full-scale prototypes of steel.

    Download full text (pdf)
    fulltext
  • 83.
    Berglund, Johan
    et al.
    Sandvik Tooling.
    Brown, Christopher A.
    Department of Mechanical Engineering, Worcester Polytechnic Institute, Worcester, MA, USA.
    Rosén, Bengt-Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Bay, Niels
    Department of Mechanical Engineering, Technical University of Denmark, Lyngby, Denmark.
    Milled die steel surface roughness correlation with steel sheet friction2010In: CIRP annals, ISSN 0007-8506, E-ISSN 1726-0604, Vol. 59, no 1, p. 577-580Article in journal (Refereed)
    Abstract [en]

    This work investigates correlations between the surface topography of milled steel dies and friction with steel sheet. Several die surfaces were prepared by milling. Friction was measured in bending under tension testing. Linear regression coefficients (R2) between the friction and texture characterization parameters were tested. None of the height, spacing, material volume, void or segmentation parameters showed good correlations. Developed area, rms surface gradient, relative area and complexity showed strong correlations (R2 > 0.7). For area-scale fractal complexity the correlation increases markedly at scales below 200 μm2, with a maximum R2 of 0.9 at 50 μm2.

  • 84.
    Bergman, Martin
    et al.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Eriksson, Lars
    Mechanical Engineering Industrial Design, Jönköping University, Jönköping, Sweden.
    Surface appearance and impression2012In: KEER 2012: Proceedings of the International Conference on Kansei Engineering and Emotion Research, KEER 2012 / [ed] Feng-Tyan Lin Ph.D., Tainan: Department of Industrial Design, National Cheng Kung University , 2012Conference paper (Refereed)
  • 85.
    Bergman, Martin
    et al.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Eriksson, Lars
    Jönköping University, Jönköping, Sweden .
    Anderberg, Cecilia
    Getinge Infection Control AB, Research & Development Department, Sweden.
    Surface design methodology: challenge the steel2013In: Metrology and Properties of Engineering Surfaces, 2013: Proceedings of the 14th International Conference, Taipei, Taiwan, June 17-21, 2013, Bristol, UK: Institute of Physics Publishing (IOPP), 2013, p. 192-199Conference paper (Refereed)
    Abstract [en]

    The way a product or material is experienced by its user could be different depending on the scenario. It is also well known that different materials and surfaces are used for different purposes. When optimizing materials and surface roughness for a certain something with the intention to improve a product, it is important to obtain not only the physical requirements, but also the user experience and expectations. Laws and requirements of the materials and the surface function, but also the conservative way of thinking about materials and colours characterize the design of medical equipment. The purpose of this paper is to link the technical- and customer requirements of current materials and surface textures in medical environments. By focusing on parts of the theory of Kansei Engineering, improvements of the companys' products are possible. The idea is to find correlations between desired experience or «feeling» for a product, -customer requirements, functional requirements, and product geometrical properties -design parameters, to be implemented on new improved products. To be able to find new materials with the same (or better) technical requirements but a higher level of user stimulation, the current material (stainless steel) and its surface (brushed textures) was used as a reference. The usage of focus groups of experts at the manufacturer lead to a selection of twelve possible new materials for investigation in the project. In collaboration with the topical company for this project, three new materials that fulfil the requirements -easy to clean and anti-bacterial came to be in focus for further investigation in regard to a new design of a washer-disinfector for medical equipment using the Kansei based Clean ability approach CAA. © Published under licence by IOP Publishing Ltd.

    Download full text (pdf)
    fulltext
  • 86.
    Berndtzen, Robin
    Halmstad University, School of Business and Engineering (SET).
    ROLL UP! Produkten som förenklar hanteringenav en dragfjäder: Ett examensarbete som startade med en enkel idé och utvecklades till en prototyp2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report presents an independent thesis corresponding 15hp and was carried out on Högskolan in Halmstad during the spring of 2014. The thesis is the final course which ends a three-year mechanical engineering program with focus on technical design.

    The thesis started in an operation which electricians are exposed to every day. The operation in question is cable laying or wiring. The tool they use is called a tension spring and is a long and stiff wire, usually made out of nylon or fiberglass. The tension spring is fed through pipes in the walls and brings the desired cables with it on the way back. The problem shows up when the tension spring is drawn back by the electrician. The stiffness in the tension spring causes it to tangle itself and that causes unnecessary irritation and a waste of time. The problem gave an electrician and a good friend an idea about a product that could solve the problem in an easy and functional way.

    The idea started as a simple idea and with the help of several different product development methods from a production-, construction-, and design point of view a special methodology was developed, perfectly customized for the thesis. Potential customer gave the verdicts and helped create the needs and requirements for the product. The product went through a big process with creating different concepts and a lot of time was spent in CATIA for the final creation. One of the great goals of the thesis was to create a functional prototype, something that has been achieved and is now ready to be tested in a real environment. 

    Download full text (pdf)
    fulltext
  • 87.
    Berrimi, Chihab Eddine
    et al.
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Chaparala, Anish
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    A STUDY ON THE SURFACE TOPOGRAPHY AND DIMENSIONAL ACCURACY OF FUSED DEPOSITION MODELING: THE EFFECTS OF SURFACE ORIENTATION AND DIFFERENT PRINT SETTINGS2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The ease of manufacturing complex geometries using fused deposition modeling (FDM) 3D-Printing reduces the overall production cost compared with the traditional manufacturing techniques. Because of the benefits of 3D printing technologies, it is proposed to be used in the manufacturing of different products. But there is still no definite characterization of the surface quality of objects manufactured by 3D printing. Hence in order to define the texture of the surfaces produced, measurements from different samples are taken and quantified.In this study, a 3D test model consisting of various slopes is printed at different layer thicknesses and different print speeds using different 3D printers.Thus, the effect of the surface orientation on the surface roughness was studied in relation to the different layer thicknesses and different print speeds. The study samples are measured using the state of the art equipment at Halmstad University.This thesis studies the surface roughness at different slopes of FDM models.A related study on the dimensional variation between the CAD model and the actual3D printed model, and causes/reasons for the variations are analyzed.It is observed that FDM produced part surface topography is directly affected by the orientation of the surface. Also, the surface roughness increases with increase in layer thickness. The observed correlations between surface roughness and layer thickness and surface orientation could be used to better understand the behavior of FDM surfaces, thus to better quantify the surface roughness. To improve quality, it must first be quantified. It is well observed that dimensional inaccuracy exists between the CAD model and the printed part. These results suggest that there is a lot of work and improvements to be done in order to close the gap of dimensional inaccuracy and achieve a high precision commercial FDM 3Dprinting.

    Download full text (pdf)
    fulltext
  • 88.
    Berthag, Mikael
    Halmstad University, School of Business and Engineering (SET).
    Kameradolly2010Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [sv]

    Detta examensarbete är en fortsatt utveckling av ett tidigare arbete som jag själv tagit fram i kursen ”Datorstödd Konstruktion och Prototypframtagning 22,5hp”. Tanken är att jag tillsammans med företaget Ugglarps Mekaniska m.fl. ska försöka ta fram en färdig modell och prototyp på en kameravagn som har till uppgift att underlätta möjligheten att göra jämna och följsamma filmningar i olika sorters miljöer. Examensarbetet som jag genomför omfattar endast 7,5hp till skillnad ifrån de vanligaste förekommande examensarbetena som är på 15hp. Med tanke på detta så har omfattningen för undersökningar, analyser, och tillverkning av kameravagnen blivit en aning begränsad.

    Mycket av mitt examensarbete bygger framförallt på mitt tidigare arbete när det gäller brainstorming, marknadsundersökning, konceptlösningar, konstruering, kriterieframtagning, komponentval m.m.

    Det som jag under detta arbete har färdigställt är bl.a. tillverkningsmetod för samtliga komponenter, samt tillverkning på huvuddelen av dessa komponenter.

    Resultatet av den vagn som jag tagit fram är mycket tillfredställande med avseende på de kriterier som jag tagit fram, samt förväntningarna ifrån branschen. Det har varit ett nöje att genomföra detta arbete och förhoppningarna är stora när det gäller marknadsföring av den framtagna konstruktionen.

    Download full text (pdf)
    FULLTEXT01
  • 89.
    Bjartmarz, Freyr
    Halmstad University, School of Business, Engineering and Science.
    Design och konstruktion av balanscykel i bambu2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This project was carried out in the USA in cooperation with Kansas University and the organization HERObike. HERObike is a nonprofit organization that wants to develop the society in the impoverished countryside areas of Alabama. The aim of the project was to construct a balance-bike in bamboo since bamboo is a local material in Alabama that HERObike can easily use in the production. The purpose was to increase the employment of the people living in Greensboro Alabama and give them experience within the manufacturing industry. The construction of the bike is a complementary to the current bikes that are manufactured since the balance-bike does not require earlier knowledge in craftsmanship. With this project HERObike wish to give more working possibilities for the poor people in Greensboro, Alabama.

    Download full text (pdf)
    fulltext
  • 90.
    Björk, Eva-Stina
    Halmstad University, School of Business, Engineering and Science, Centre for Innovation, Entrepreneurship and Learning Research (CIEL).
    Insider Action Research (IAR) of product development processes2004In: TOOLS AND METHODS OF COMPETITIVE ENGINEERING Vols 1 and 2 / [ed] Horvath, I Xirouchakis, P, Rotterdam: Millpress Science Publishers , 2004, p. 1043-1052Conference paper (Refereed)
    Abstract [en]

    Performing product development means to simultaneously develop product systems, production processes and marketing efforts. Product Development processes are often complex as they are time dependent and contain many inter-dependencies e.g. between parts and individuals involved Due to the complexity in these processes the methods for research on integrated product development processes need to be designed differently than traditional research methods used. The study of details of totalities can work for mechanical systems but less well for complex systems. For a deeper knowledge of complex systems substantial researcher involvement and participation in real time is essential, which Insider Action Research (IAR) is designed for. IAR can be performed from the three main positions as observer, team member or project leader. The-following conclusions have been drawn (Bjork 2003): The IAR approach is beneficial in most types of development processes and projects when the aim of the research is to achieve increased knowledge and understanding. A mix of detailed and narrative descriptions of a research project provides also practitioners with an opportunity to adopt the findings. The implementation of research results would thereby become facilitated, which is an effect that most researchers as well as practitioners would benefit from.

  • 91.
    Björk, Hanna
    et al.
    Halmstad University, School of Health and Welfare.
    Fred, Lisa
    Halmstad University, School of Health and Welfare.
    Whistleblowing- "En livlina att grabba tag i": En studie om rapportörers möjligheter att rapportera2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Whistleblowing är en möjlighet för en person att anonymt rapportera om en oegentlighet som förekommer inom organisationen. Studien har undersökt organisatoriska faktorer som påverkar denna möjlighet för den anställda, där fokus legat på vilka effekter rapporteringsstrukturen och organisationskulturen har för möjligheterna att rapportera. Undersökningen har utgått från en kvalitativ metod där intervjuer med fackliga företrädare har genomförts. Undersökning visade att det viktiga för att en whistleblowing-funktion ska ha en fungerande rapporteringsstruktur var kunskap om att funktionen finns, annars är det svårt att förvänta sig att få in rapporter. Vidare är det viktigt med tydliga rapporteringskanaler och riktlinjer där det framgår vad som är angeläget att rapportera om. Gällande organisationskulturen så var vikten av ett bra ledarskap det som framträdde tydligast. Har man ett ledarskap som tillåter en öppen kultur med högt i tak så skulle man inte vara i behov av funktionen i samma grad som om det vore lågt i tak. Är situationen sådan att man har anställda som använder sig av funktionen är det viktigt att man skapar en kultur där man som chef ser rapportörens handling som en förbättringsmöjlighet och därmed inte tilltar repressalier eller efterforska rapportören. Överlag var inställningen till funktionen att det vara bra att den fanns som ett alternativ, men att det primära borde vara att sträva mot en kultur där man kan ha dialoger på arbetsplatsen.

    Download full text (pdf)
    fulltext
  • 92.
    Blidnert, Jonas
    et al.
    Halmstad University, School of Business, Engineering and Science.
    Ellertsson, Philip
    Halmstad University, School of Business, Engineering and Science.
    Konstruktion och utformning av skydd till spolverk2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis has been carried out in cooperation with Burseryds Bruk AB.

    Burseryds Bruk is a company that manufactures steel strapping. The thesis is

    about developing a concept of protection that should be used to protect the

    operators from the rotating parts of the machinery lines. The aim of the project

    was to improve work safety for operators working at the machines by producing a

    concept for a protective device.

     

    The project's first part was based on ergonomic data collection methods to

    understand the operations performed on the machine and the hazard occurring

    during the process. The methods used to collect data were, interviews,

    observations and questionnaires with the operators of the company. This was then

    used to make the ergonomic analyzes hierarchical task analysis and link analysis.

     

    The data collected from the company's operators was used create 10 concepts

    which were then evaluated. The standard "General requirements for the design

    and construction of fixed and movable guards" were examined at the concept

    development process.

     

    The selected protection tested and simulated in a modeled machine line where

    Computer manikins used together with protection. The project ended with risk

    analyzes on the developed protection with the help of simulations in the CAD

    program Catia workbenches and a standard for risk analysis.

    Download full text (pdf)
    fulltext
  • 93. Blom, Elin
    et al.
    Johnsson, Jesper
    Klit, Max
    Energieffektivisering av flerbostadshus: Energieffektiviseringspotentialen undersöks i ett kvarter med flerbostadshus från 1940-talet2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The thesis cover the energy efficiency of a multi-family house from the 1940s situated in Halmstad. As the energy performance in buildings gets better and the energy solutions aregetting smarter, the requirements will be higher for new construction. On the other hand, realestate from the 40's remains the same and are often operated with the same heating systemsas those when originally put into operation.The purpose of the report is to investigate the potential for energy efficiency in olderbuildings as well as the financial consequences of the energy-efficient solutions.The thesis is written on behalf of Halmstad Fastighets AB (HFAB), who intends to evaluatethe neighborhood in 2019 and subsequently decide on the future of the housing area. Thereport is based on this area as a reference and the action proposals presented in the report aresimulated in this housing area. The housing area was commissioned in 1943 and consists offive houses, one longer structure and four point-houses, which makes it the first multiresidentialarea owned and operated by the company. HFAB has an internal target of 75 kWh/m2, year for the entire property stock at the turn of the year 2050, which represents a targetvalue that the report intends to achieve.The report is divided into two parts, the first describing the buildings' current energy systemfrom a theoretical and technical point of view and including an energy survey on existingenergy flows for the properties. The energy survey then constitute the foundation for thesecond part, where theory and technical construction of the systems installed with the actionproposals are described together with reports on the theory for energy saving calculations.The results show that a renovation and investment with modern technology and energyefficient solutions has a major impact on the final energy use, even reaching lower specificvalues than those defined as internal goals within the company. Energy-efficient investmentscan also be a profitable investment from an economic point of view, providing additionalincentives for the property owner.

    Download full text (pdf)
    fulltext
  • 94.
    Blomqvist, Per
    et al.
    Halmstad University, School of Business, Engineering and Science.
    Athir, Patrus
    Investigation of Wear in Spline Coupling for Saw Unit JPS R55002019Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    JPS Teknik AB in Färila, located in the middle of Sweden, is a company in manufacturingsaw units to harvester heads. This thesis is about the company's best selling saw unit, JPSR5500. The saw unit is powered by a hydraulic motor, the torque is transmitted from themotor into the saw unit thought a spline coupling. In this spline coupling, some of the unitshave been weared out after about 2000 harvester machine hours. When the splines wear outthe failure induce a total stop, the bolt connecting the hub and the motor shaft breaks, and thesaw unit assembly get loose. The purpose with this study is to find the root cause of thefailure and the goal is to give suggestions to improve the design to avoid failure.

    The method used to achieve the purpose is based on Ullman's mechanical design processwhere a root cause analysis is a central part. This analysis is built on two main pillars, aliterature study concerning previous research about wear in spline couplings and a knowledgebased study about the product with a customer focus. A sample of previous research in thistopic is about the load distribution in a spline coupling due to different load cases and angularmisalignment, wear mechanisms and the effect of washers in a pretension bolt joint with adynamic working condition.

    The main conclusions of this study is that the hydraulic motor axis should be extended. Theoperator's manual and assembly instructions should be updated and revised annually, thecompany should also invest in education and training for the users of the product.

    Download full text (pdf)
    fulltext
  • 95.
    Bolmsjö, Gunnar
    et al.
    Division of Machine Design, Department of Design Sciences LTH Lund University, Lund, Sweden.
    Petersson, Håkan
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Tillämpad konstruktion (Digitala verktyg). Division of Machine Design, Department of Design Sciences LTH Lund University, Lund, Sweden.
    Bjärnemo, Robert
    Division of Machine Design, Department of Design Sciences LTH Lund University, Lund, Sweden.
    Robot assisted framing: A concept for securing geometry in flexible production2008Report (Refereed)
    Abstract [en]

    The paper describes a concept for securing the geometry in flexible production based on robot assisted framing. This uses the robot(s) as an active device during change-over between product variants and it is assumed that product variants can be produced in any mixed order. The case under study is cabs for trucks which in traditional production require large and heavy equipment which is above the payload of any robot. The idea within this study is to use carbon fibre composites in the fixtures in order to reduce the weight and through this make it possible to use the robots in assisting the framing process. The current work involves a generalization of the principle both considering the design of the fixtures with respect to issues such as materials properties and design principles, and design of the production system.

     

  • 96.
    Bondéus, Emilia
    et al.
    Halmstad University, School of Business, Engineering and Science.
    Ellmarker, Josefin
    Halmstad University, School of Business, Engineering and Science.
    CareEagle - Det unika hjälpmedlet för ambulanssjukvården: CareEagle – The unique stand-by for the pre-hospital medical care2016Independent thesis Basic level (university diploma), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    Every year SOS Alarm receives 3.5 million emergency calls via 112 and an ambulance is needed in one million of these situations. Working as a paramedic is very physically demanding and the profession is over-represented, in terms of attritional wear on the lower back and the shoulders. Every day the paramedics need to perform many heavy lifts and the deadlift is one of the most demanding. They perform a deadlift when a patient should be lifted from the ground up to height of the haunch. When the deadlift is completed, the paramedics transport the patient to the ambulance.

    Work below the knees and over the shoulders should not occur by ergonomic recommendations. When the paramedics perform a deadlift it’s always start below their knees which means that the start position is not advantageous and there is a high risk to be injured. There are many factors that can affect the lifting situation in a negative way for example uneven surfaces, tight spaces and worried patients.

    In this project a unique product has been developed to replace the deadlift which is a huge problem that no one else has solved before. By using the product, the deadlift can now be done with minimal use of human power. The product significantly simplifies the care of the patients and will reduce work-related injuries in the pre-hospital medical care.

    Download full text (pdf)
    fulltext
  • 97.
    Bordag, Michael
    et al.
    Leipzig University, Vor Dem Hospitaltore 1, Leipzig, Germany.
    Nikolaev, Vladimir
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS).
    Analytic corrections to the electromagnetic casimir interaction between a sphere and a plate at shortdistances2010In: International Journal of Modern Physics A, ISSN 0217-751X, E-ISSN 1793-656X, Vol. 25, no 11, p. 2171-2176Article in journal (Refereed)
    Abstract [en]

    For the vacuum interaction of asphere in front of a plane,both obeying conductor boundary conditions, we consider the approximation of small separation. We derive the next-to-leading order of the asymptotic expansion in the separation-to-radius ratio epsilon. This correction is of order epsilon. In opposite to the scalar cases it contains also contributions proportional to logarithms in first and second order, epsilon ln epsilon and epsilon(ln epsilon)(2). We compare this result with the available findings of numerical and experimental approaches.

  • 98.
    Borg, Cecilia
    et al.
    Halmstad University, School of Business, Engineering and Science.
    Bengtsson, Malin
    Halmstad University, School of Business, Engineering and Science.
    Ställtidsreducering: av vald pilotmaskin enligt SMED-metodiken2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In today's society there are strict requirements for manufacturing companies and they have to

    be efficient to maintain and increase their profitability, thus meeting the competition that

    exists. Effective transitions are becoming increasingly important for companies as customers

    demand a variety of their products, therefore, it is imperative to keep the setup time low in

    order to be able to offer customers the quality and variety demanded.

    Set Time Reduction means reducing changeover times at the machine without reducing

    production capacity. The SMED-method helps to get a better understanding of how, through

    a structured approach, companies can reduce setup times at the machine.

    The company DS Smith had a need to get control of their set-up times and get a structured

    approach that operators can work with. The authors' assignments / thesis has been to chart

    the current situation across 8 converting machines available at DS Smith in Värnamo, and

    then get an overview of how operators are working in the current situation. In order to map

    the current situation, the authors made use of qualitative studies, such as interviews and

    observations. They then selected one of the eight machines for the implementation of the

    SMED-method in five steps, where the authors have used literature studies and article search

    to gain knowledge on the subject and achieve results that were reliable.

    The work has resulted in an approach that operators can use in the future and according to

    reducing changeover times at the machines.

    Download full text (pdf)
    fulltext
  • 99.
    Borgström, Karin Margaretha
    et al.
    Halmstad University, School of Business, Engineering and Science, Centre for Innovation, Entrepreneurship and Learning Research (CIEL), Sustainability, Innovation and Management in Building (SIMB).
    Böhm, Benny
    A comparison of different methods for in-situ determination of heat losses from district heating pipes1996Report (Other academic)
    Abstract [en]

    In the IEA Network Supervision project a special method, the Tx-factor method, is investigated. Several other methods exist for in-situ heat loss determination from district heating (DH) pipes. These methods have advantages and disadvantages compared to the Tx-factor method. It is the purpose of this work to make a comparison of the methods on a particular DH pipe. This makes this investigation special as in most previous work only one or very few methods have been applied on the same DH pipe. The purpose of this work was thus to go out to the site and make measurements of the heat loss from the DH pipe at this particular time of the year - an estimate of annual heat losses could then to be made afterwards. The aim of this work being to develop methods for practical applications not very sophisticated tools were used at the experimental site. This means that although very advanced equipment could have been used for determining the centre line and the depth of the DH pipe only measurement sticks, water levels and strings were used. For the same reasons the temperature sensors were installed by using measurement sticks

  • 100.
    Borja, Álvaro
    Halmstad University, School of Business, Engineering and Science.
    Molten Salt Storage at CHP Plant2017Independent thesis Advanced level (degree of Master (One Year)), 40 credits / 60 HE creditsStudent thesis
    Abstract [en]

    Nowadays the main challenge for the energy system is the capability of storing the energy forlater use. To deal with this problem, molten salt storage technology is being used in some solarfacilities. By its implementation, the energy can be stored in the form of heat. However, thefeasibility of this technology is in a testing stage. Its implementation could be done in differentenergy fields. In this thesis, a novel implementation is suggested nearby a CHP, with the aim ofutilizing the excess electricity provided by the grid in high energy production days. Differentimplementation methods and a real scenario are presented. A study analysis of the tank’s sizeand the amount of molten salt needed as well as an economic analysis are provided. Numericalapproximations are given and results shown according to the theoretical analysis developed.

    Download full text (pdf)
    fulltext
1234567 51 - 100 of 738
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf