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  • 251.
    Gadd, Henrik
    et al.
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Energiteknik.
    Werner, Sven
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS).
    Daily heat load variations in Swedish district heating systems2013In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 106, p. 47-55Article in journal (Refereed)
    Abstract [en]

    Heat load variations in district heating systems are both seasonal and daily. Seasonal variations have mainly its origin from variations in outdoor temperature over the year. The origin of daily variations is mainly induced by social patterns due to customer social behaviours. Heat load variations cause increased costs because of increased peak heat load capacity and expensive peak fuels. Seasonal heat load variations are well-documented and analysed, but analyses of daily heat load variations are scarce. Published analyses are either case studies or models that try to predict daily heat load variations. There is a dearth of suitable assessment methods for more general analyses of existing daily load variations. In this paper, a novel assessment method for describing daily variations is presented. It is applied on district heating systems, but the method is generic and can be applied on every kind of activity where daily variations occur. The method was developed from two basic conditions: independent of system size and no use of external parameters other than of the time series analysed. The method consists of three parameters: the annual relative daily variation that is a benchmarking parameter between systems, the relative daily variation that describes the expected heat storage size to eliminate daily variations, and the relative hourly variation that describes the loading and unloading capacity to and from the heat storage. The assessment method could be used either for design purposes or for evaluation of existing storage. The method has been applied on 20 Swedish district heating systems ranging from small to large systems. The three parameters have been estimated for time series of hourly average heat loads for calendar years. The results show that the hourly heat load additions beyond the daily averages, vary between 3% and 6% of the annual volume of heat supplied to the network. Hereby, the daily variations are smaller than the seasonal variations, since the daily heat load additions, beyond the annual average heat load, are between 17% and 28% of the annual volume of heat supplied to the network. The size of short term heat storage to eliminate the daily heat load variations has been estimated to a heat volume corresponding to about 17% of the average daily heat supplied into the network. This conclusion can also be expressed as an average demand of 2.5 m3 of heat storage volume per TJ of heat supplied by assuming a water temperature difference of 40 C. The capacity for loading and unloading the storage should be equal to about half of the annual average heat load for heat supplied into the network. © 2013 Elsevier Ltd.

  • 252.
    Gadd, Henrik
    et al.
    Oresundskraft AB, S-25106 Helsingborg, Sweden..
    Werner, Sven
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Fault detection in district heating substations2015In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 157, p. 51-59Article in journal (Refereed)
    Abstract [en]

    Current temperature levels in European district heating networks are still too high with respect to future conditions as customer heat demands decrease and new possible heat source options emerge. A considerable reduction of temperature levels can be accomplished by eliminating current faults in substations and customer heating systems. These faults do not receive proper attention today, because neither substations nor customer heating systems are centrally supervised. The focus of this paper has been to identify these faults by annual series of hourly meter readings obtained from automatic meter reading systems at 135 substations in two Swedish district heating systems. Based on threshold methods, various faults were identified in 74% of the substations. The identified faults were divided into three different fault groups: Unsuitable heat load pattern, low average annual temperature difference, and poor substation control. The most important conclusion from this early study of big data volumes is that automatic meter reading systems can provide proactive fault detection by continuous commissioning of district heating substations in the future. A complete reduction of current faults corresponds to approximately half the required reduction of the current temperature levels in the effort toward future low-temperature district heating networks. (C) 2015 The Authors. Published by Elsevier Ltd.

  • 253.
    Gadd, Henrik
    et al.
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Energiteknik.
    Werner, Sven
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS).
    Heat load patterns in district heating substations2013In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 108, p. 176-183Article in journal (Refereed)
    Abstract [en]

    Future smart energy grids will require more information exchange between interfaces in the energy system. One interface where dearth of information exists is in district heating substations, being the interfaces between the distribution network and the customer building heating systems. Previously, manual meter readings were collected once or a few times a year. Today, automatic meter readings are available resulting in low cost hourly meter reading data. In a district heating system, errors and deviations in customer substations propagates through the network to the heat supply plants. In order to reduce future customer and heat supplier costs, a demand appears for smart functions identifying errors and deviations in the substations. Hereby, also a research demand appears for defining normal and abnormal heat load patterns in customer substations. The main purpose with this article is to perform an introductory analysis of several high resolution measurements in order to provide valuable information about substations for creating future applications in smart heat grids. One year of hourly heat meter readings from 141 substations in two district heating networks were analysed. The connected customer buildings were classified into five different customer categories and four typical heat load patterns were identified. Two descriptive parameters, annual relative daily variation and annual relative seasonal variation, were defined from each 1 year sequence for identifying normal and abnormal heat load patterns. The three major conclusions are associated both with the method used and the objects analysed. First, normal heat load patterns vary with applied control strategy, season, and customer category. Second, it is possible to identify obvious outliers compared to normal heat loads with the two descriptive parameters used in this initial analysis. Third, the developed method can probably be enhanced by redefining the customer categories by their indoor activities.

  • 254.
    Gadd, Henrik
    et al.
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Energy Science.
    Werner, Sven
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Energy Science.
    Thermal energy storage systems for district heating and cooling2015In: Advances in Thermal Energy Storage Systems: Methods and Applications / [ed] Luisa F. Cabeza, Cambridge: Woodhead Publishing Limited, 2015, 1, p. 467-478Chapter in book (Refereed)
    Abstract [en]

    The context for this chapter is the current use and typical applications of thermal energy storages within contemporary district heating and cooling systems in the Nordic countries. Examples include a new assessment method, distributed heat storages, and hourly, daily, weekly, and seasonal heat and cold storages. Specific sizes have been estimated for 209 heat storages and 9 cold storages.

  • 255.
    George, Raiju Michael
    et al.
    Halmstad University.
    Palayil Saseendran, Shyamkumar
    Halmstad University.
    Qualitative and quantitative study of existing surface parameters and their correlation to CWS parameters in Automobile Industry: Surface texture parametric study of CWS2018Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Surface roughness is an important parameter in the automotive Industry. This thesis is a study conducted in collaboration with QSO Interferometer systems AB (QSAB), Halmstad. The study is focused on the existing surface roughness parameters used in the automotive industry and the relationship to the CWS parameters of QISAB. The study also investigates the scope of CWS instrument developed by QISAB as a next-generation automated surface testing inline instrument. The initial study which has been conducted had 5 stages, those are the history of roughness measurement, the basic CWS parameters, the currently used surface testing instruments in the automobile industry, the use of surface metrology in the manufacturing industry and the basic principle and theory of the CWS. As the final stage to achieve the aim of the thesis a quantitative study has been conducted to compare the existing parameters with CWS parameters. The three type of comparison were done on a test piece having different range of surface roughness after different stages of grinding. These three comparisons that had been done were CWS v/s White light interferometer v/s visual inspection. The results from those quantitative analysis did support the results from the qualitative analysis.

  • 256.
    Geraldsson, Oskar
    et al.
    Halmstad University, School of Business, Engineering and Science.
    Ylander Mikkelsen, Kristoffer
    Halmstad University, School of Business, Engineering and Science.
    Omkonstruktion och dimensionering av stålchassi till portabla bränslestationer2017Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [sv]

    Denna rapport kommer att avhandla det examensarbete som genomförts inom CAD-Teknikerprogrammet på Högskolan i Halmstad. Arbetet har genomförts på Maltes Fuel & Wash AB och startade 24:e mars 2017 med slutpresentation den 23:e maj 2017.

    Malte Fuel & Wash AB är ett företag baserat i Halmstad och tillverkar bland annat portabla bränslestationer till oljeindustrin samt bilindustrin. Den produkt som detta projekt kretsas runt är deras nyaste version av en minitank som rymmer ca 57m^3 bränsle som är en lite större variant av deras nuvarande portabla bränslestationer.

    Uppdraget från Maltes Fuel & Wash Ab var att optimera stålchassit så de väger så lite som möjligt men ska klara transporten utan några skador samt deformationer i materialet. Då det är en portabel konstruktion så måste man räkna med att den ska kunna lyftas med kran och transporteras på lastbilar då ett problem som kan uppstå är böjningar i balkarna då de är 12m långa och blir belastade ca 18 ton av resten av konstruktionen.

    För att lösa dessa problem så har uppdraget uppdelats i olika delmoment som ska lösas på olika sätt. Det har tagits fram olika 3D koncept och optimeringsberäkningar samt FEM analyser med hjälp av Catia v5. Dessa koncept har utvärderats så att de uppfyller Maltes Fuel & Wash AB’s krav och önskemål.

  • 257.
    Ghadirinejad, Nickyar
    et al.
    Halmstad University, School of Business, Engineering and Science.
    Ottermo, Fredric
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Hoseinzade, A.
    University of Sistan and Baluchestan, Zahedan, Iran.
    Experimental Evaluation, Simulation and Statistical Analysis of a Humidification-Dehumidification Solar Desalination System2018Conference paper (Other academic)
    Abstract [en]

    Inspired by the precipitation cycle, the Humidification-Dehumidification (HDH) method is based on evaporation and consecutive condensation in a natural loop. The heat input to the system is provided by a solar collector, making the system suitable for remote locations with access to sea water and good insolation. In this study investigated parameters included temperatures and flow rates of cooling water, cycled air, and water intake to humidifier, as well as the height of packed bed column. A series of simulations has been performed in the ASPEN Plus software, in order to obtain optimum physical parameters in this desalination system. The experimental results showed that at constant heat flux and optimum air flow rate, three parameters have strong influence on the production of distilled water: the flow rate of cooling water, the flow rate of water inlet and its temperature augmentation. Moreover, although increasing flow rate of cooling water leads to an increase in the distilled water flow rate, this effect is mitigated at high rates. The most reliable Height Equivalent to a Theoretical Plate (HETP) model of random packing has been found by opting for the model of Mangers & Ponter. The estimated error of the model in predicting the height of the packed bed was less than 4%. Regarding closed versus open air flow; the closed air system provided an efficiency of distilled water production up to 15% higher than the open air system for the same conditions. This increase is a result of prevention of the loss of air humidity at the condenser outlet. A regression analysis was performed, which indicates that the HDH system can be well described by a linear model for the logarithm of the rate of desalinated water. The variables used are the saline water flow rate, the heat transfer rate in the solar collector and the air flow rate. The adjusted R-squared of the fit was computed as 89.8%.

  • 258.
    Glon, Fanny
    et al.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces. ENISE, Saint-Etienne, France.
    Flys, Olena
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces. SP Technical Research Institute of Sweden, Borås, Sweden .
    Lööf, Pär-Johan
    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.
    3D SEM for surface topography quantification – a case study on dental surfaces2014In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 483, no 1, article id 012026Article in journal (Refereed)
    Abstract [en]

    3D analysis of surface topography is becoming a more used tool for industry and research. New ISO standards are being launched to assist in quantifying engineering surfaces. The traditional optical measuring instrumentation used for 3D surface characterization has been optical interferometers and confocal based instrumentation. However, the resolution here is limited in the lateral dimension to the wavelength of visible light to about 500 nm. The great advantage using the SEM for topography measurements is the high flexibility to zoom from low magnifications and locating interesting areas to high magnification of down to nanometer large surface features within seconds. This paper presents surface characterization of dental implant micro topography. 3D topography data was created from SEM images using commercial photogrammetric software. A coherence scanning interferometer was used for reference measurements to compare with the 3D SEM measurements on relocated areas. As a result of this study, measurements emphasizes that the correlation between the accepted CSI measurements and the new technology represented by photogrammetry based on SEM images for many areal characterization parameters are around or less than 20%. The importance of selecting sampling and parameter sensitivity to varying sampling is high-lighted. Future work includes a broader study of limitations of the photogrammetry technique on certified micro-geometries and more application surfaces at different scales. © Published under licence by IOP Publishing Ltd.

  • 259. Glöersen, Erik
    et al.
    Johnsson, Pehr-Erik
    Hyberger, Joacim
    Biogas på Wapnö: Analys av framtida energisystem2012Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    Considering that the price and demand for energy gradually has risen over the past decade and a wider discussion about the human impact on the environment has become increasingly more important and given a clearer role in modern society. This has contributed to increased incentives to reduce the use of fossil fuels and increase the use of renewable energy.The agriculture currently accounts for 20 % of Sweden's total greenhouse gas emissions. A way for an agricultural company like Wapnö AB to reduce their emissions could be to utilize existing renewable energy sources within their own premises.The report's aim is to create an energy audit of Wapnö’s existing energy system and how it changes with a future biogas plant in operation. The energy audit is used to illustrate how the company’s climate footprint could change. The report also investigates the economics of different heating options for the biogas process and the completion of the current refrigeration compressors with a heat-driven chiller, all to increase the usage of the waste heat from the cogeneration, and minimize the need of purchased energy.The results show that Wapnö can reduce their carbon emissions with 5600 tons of carbon dioxide per year with a future biogas plant in operation. The results also show that the waste heat, combined with a heat pump, is the most cost efficient way to heat the biogas process. Furthermore, the report also shows that the investment in an absorption chiller will be refunded within approximately 6 years, and that in a comparison of the reduced climate impact of either cogeneration or production of vehicle gas, at Wapnö, cogeneration provides a slightly larger reduction of greenhouse gas emissions.

  • 260.
    Gobczyński, Karol
    et al.
    Halmstad University, School of Business and Engineering (SET).
    Leroux, Maxime
    Halmstad University, School of Business and Engineering (SET).
    Socio-economic factors influencing the electric vehicle buying process in Iceland2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The aim of this research is the analysis of socio-economic factors that wouldinfluence consumer buying process of electric vehicles in Iceland. The purpose of the researchis to detect the most crucial factors influencing Icelanders decisions for and againstpurchasing an electric vehicle, instead of car with internal combustion engine. This researchverified people‟s opinions and can bring companies closer to real mindsets of Icelandicpotential buyers. Moreover, this paper might give a possibility to eliminate wrong thinkingand barriers by better adjusted marketing. Additionally, analyzed advantages might showwhat the main reason of shifting to this alternative technology is. Moreover, it shows whatmight be the customer acceptance price range.

  • 261.
    Gogia, Hardik
    et al.
    Halmstad University, School of Business, Engineering and Science.
    Shirsat, Amit
    Halmstad University, School of Business, Engineering and Science.
    An empirical investigation of How does ISO 9001 standards affect innovation and creativity2019Independent thesis Advanced level (degree of Master (One Year)), 15 credits / 22,5 HE creditsStudent thesis
  • 262.
    Gomez, Fabrizio
    Halmstad University, School of Business, Engineering and Science.
    Optimization of a grid connected residential battery storage system in Sweden: Home Energy Management System Approach2018Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The market for energy production has experienced relevant changes to reach more sustainable characteristics, during the last two decades. In this context, residential photovoltaic (PV) system has gained popularity as a practical and profitable alternative to complement the electric supply from the grid. In the same line, the seasonal and variable nature of PV supply generates an interest in BESS-battery energy storage systems.The aim with this thesis is to investigate HEMS-home energy management system for a residential electricity production using PV and storage in Sweden. HEMS allows residential customer and producer to sell or buy energy to minimize the final electricity bill. The capacityof BESS and the scheduling are optimized by using a proposed algorithm. Results gained indicate that factors such as household electricity demand and allocation during the day, electricity price, and tariff scheme are the critical variables to consider in the design of the BESS system. Optimal battery capacities obtained are within the range of available battery market stock-sizes. However, several of the standard battery capacities of the leading manufacturers are oversized for this case. For Swedish context, a BESS installation cost below 270 €/kWh generates saving on the annual electricity bill of having BESS in comparison with not using BESS. In addition, the daily charge of EV, electric vehicle, was studied to see if a higher demand for household electricity could generate an optimal capacity and higher savings.

  • 263.
    Gong, Mei
    et al.
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Energy Science.
    Wall, Göran
    Öxbo, Lerum, Sverige.
    Exergy Analysis of the Supply of Energy and Material Resources in the Swedish Society2016In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 9, no 9, article id 707Article in journal (Refereed)
    Abstract [en]

    Exergy is applied to the Swedish energy supply system for the period 1970–2013. Exergy flow diagrams for the systems of electricity and district heating as well as for the total supply system of energy and material resources for 2012 are presented. The share of renewable use has increased in both electricity and district heat production. The resource use is discussed in four sectors: residential and service, transportation, industry and agriculture. The resource use is also analyzed with respect to exergy efficiency and renewable share. The total exergy input of energy and material resources amounts to about 2700 PJ of which about 530 PJ was used for final consumption in 2012. The results are also compared with similar studies. Even though the share of renewable resource use has increased from 42% in 1980 to 47% in 2012, poor efficiency is still occurring in transportation, space heating, and food production. A strong dependence on fossil and nuclear fuels also implies a serious lack of sustainability. A more exergy efficient technology and a higher renewable energy share are needed in order to become a more sustainable society.

  • 264.
    Gong, Mei
    et al.
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Energiteknik.
    Wall, Göran
    Öxbo gård, Härryda, Sweden.
    Life Cycle Exergy Analysis of Solar Energy Systems2014In: Journal of Fundamentals of Renewable Energy and Applications, ISSN 2090-4533, E-ISSN 2090-4541, Vol. 5, no 1, article id 1000146Article in journal (Refereed)
    Abstract [en]

    Exergy concepts and exergy based methods are applied to energy systems to evaluate their level of sustainability. Life Cycle Exergy Analysis (LCEA) is a method that combines LCA with exergy, and it is applied to solar energy systems. It offers an excellent visualization of the exergy flows involved over the complete life cycle of a product or service. The energy and exergy used in production, operation and destruction must be paid back during life time in order to besustainable. The exergy of the material that is being engaged by the system will turn up as a product and available for recycling in the destruction stage. LCEA shows that solar thermal plants have much longer exergy payback time than energy payback time, 15.4 and 3.5 years respectively. Energy based analysis may lead to false assumptions in the evaluation of the sustainability of renewable energy systems. This concludes that LCEA is an effective tool for the design and evaluation of solar energy systems in order to be more sustainable.

  • 265.
    Gong, Mei
    et al.
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Energiteknik.
    Wall, Göran
    Chalmers University of Technology, Gothenburg, Sweden.
    Werner, Sven
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Energiteknik.
    Energy and Exergy Analysis of District Heating Systems2012In: 13th International Symposium on District Heating and Cooling: 3rd of September – 4th of September: Copenhagen, Denmark, 2012, p. 55-60Conference paper (Refereed)
    Abstract [en]

    The concept of exergy is defined and applied to district heating systems. The influence from different reference state conditions and system boundaries are explained in some detail. The aim is to show the simplicity and value of using the concept of exergy when analyzing district heating processes. The exergy factor is introduced and applied for a number of Swedish and Danish district heating systems. This varies from 14.2% to 22.5% for Swedish district heating systems. The higher the exergy factor, the more the exergy losses in the passive conversion towards space heating. Large losses revealed in an exergy treatment of a process should be seen as a challenge to achieve technical improvements of the system.

  • 266.
    Gong, Mei
    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).
    Enhanced Biomass CHP plants for district heating systems2019In: Book of abstracts: 5th International Conference on Smart Energy Systems in Copenhagen, on 10-11 September 2019 / [ed] Henrik Lund, Brian Vad Mathiesen & Poul Alberg Østergaard, Aalborg: Aalborg Universitetsforlag, 2019, p. 239-239Conference paper (Refereed)
    Abstract [en]

    In Sweden, located in North Europa, more than half of the total heat demand in buildings is met by district heating, but only just above one-third of the heat supply comes from Combined Heat and Power. In this paper, a new enhancement of biomass CHP plant is explored. The modification is that a large absorption heat pump is used for the heat supply to the district heating network. This new solution has so far never been implemented outside China. The benefits will be more electricity from lower condenser pressure and more heat obtained from flue gas condensation. The drawback is that the absorption heat pump will require extracted steam that will decrease electricity generation. In order to estimate the offset between the two benefits and the drawback, a simplified model has been developed to study a typical Swedish biomass CHP plant located in Lund. This enhancement could be part of the transition from third generation district heating (3GDH) to fourth generation district heating system (4GDH) by introducing efficient heat supply plants in current systems with high distribution temperatures. Several cases studied concerning both 3GDH and 4GDH have been compared to reference cases. The results show that the enhancement is a possible way to prepare for future 4GDH. Further investigations are recommended concerning pre-investment in absorption heat pumps as a transition strategy for new CHP plants originally designed for return temperatures of 20-30 ºC.

  • 267.
    Gong, Mei
    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).
    New system solution for biomass CHP plant2019Report (Other academic)
    Abstract [en]

    The main propose with this pre-study was to assess a new Chinese concept concerning Combined Heat and Power (CHP) plants for typical Swedish conditions with biomass as fuel. The new enhancement is to use a large absorption heat pump for the final heat supply instead of the turbine condenser. More heat can then be recovered from the three units that will deliver the heat (the flue gas condenser, the turbine condenser and the absorption heat pump). So far, this new CHP solution has never been implemented outside China. For this pre-study, the simulation model was elaborated on design data from the Örtofta biomass CHP plant outside Lund. The results show that Chinese concept will provide the higher conversion efficiency, but with lower power-to-heat ratio. The main benefit is that more heat can be recycled from the flue gas condenser. The payback time of installing absorption heat pump is always over eight years within expected intervals for alternative costs for electricity and heat. The Chinese concept is less suitable for the Swedish context with biomass backpressure CHP plants, since the proportion of lost electricity becomes rather high. The Chinese context with utilization of existing condensation turbines is still interesting, since condenser heat can be recycled without major modification of existing turbines.

  • 268.
    Gong, Mei
    et al.
    Halmstad University, School of Business and Engineering (SET), Biological and Environmental Systems (BLESS), Energiteknik.
    Werner, Sven
    Halmstad University, School of Business and Engineering (SET), Biological and Environmental Systems (BLESS), Energiteknik.
    On district heating and cooling research in China2014In: Proceedings from the 14th International Symposium on District Heating and Cooling: September, 6-10, 2014: Stockholm, Sweden, Stockholm: Swedish District Heating Association , 2014, p. 325-332Conference paper (Refereed)
    Abstract [en]

    The growth of the Chinese district heating sector has been very rapid during recent years. No other country in the world can show the same rapid growth of district heating systems during the last decades. Heated building area increased six times between 1995 and 2008 according to the Chinese district heating statistics. China has also enjoyed strong growth of scientific articles and papers published about district heating in recent years. During 2010-2012, one third of all international scientific journal articles and conference papers about district heating came from Chinese scientists, while Swedish researchers accounted for one quarter. It is important to identify the Chinese district heating and cooling research to judge the potential for future collaborative research on district heating systems between Sweden/Europe and China. Until 2013, Chinese district heating and cooling scientists have published 205 international publications on district heating and 36 publications on district cooling. In this paper, these articles are mapped and summarised with respect to topics, active research institutions, and their technology focuses. Another approach is to grasp the Chinese interest for more diversified heat supply, since many new systems are established and thereby have more degrees of freedom when choosing by various heat supply and technology options.

  • 269.
    Gonzalez, Victoria
    et al.
    Halmstad University, School of Business, Engineering and Science.
    Ruiz Castro, Pamela
    Halmstad University, School of Business, Engineering and Science.
    Evaluation of a human-robot collaboration in an industrial workstation2018Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The fast changes in the industry require improved production workstations which ensure the workers' safety and improve the efficiency of the production. Technology developments and revised legislation have increased the possibility of using collaborative robots. This allows for new types of industry workstations where robots and humans cooperate in performing tasks. In addition to safety, the design of collaborative workstations needs to consider the areas of ergonomics and task allocation to ensure appropriate work conditions for the operators, while providing overall system efficiency. By facilitating the design development process of such workstations, the use of software simulations can help in gaining quality, save time and money by supporting decision making and testing concepts before creating a physical workstation, in turn, aimed to lead to better final solutions and a faster process of implementation or reconfiguration. The aim of this study is to investigate the possibility of having a human-robot collaboration in a workstation that is based on a use-case from the industry. The concept designs will be simulated and verified through a physical prototype, with which ergonomic analysis, time analysis, and risk assessments will be compared to validate the resultant collaborative workstation.

  • 270.
    Gopathi, Pranay
    et al.
    Halmstad University, School of Business, Engineering and Science. Miljöbron Skåne.
    Surve, Pratik
    Halmstad University, School of Business, Engineering and Science. Miljöbron Skåne.
    Possibilities and Limitations of using Production Waste PET and PES materials in Additive Manufacturing (3D Printing Technology)2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
  • 271.
    Goulas, A.
    et al.
    Loughborough University, Loughborough, United Kingdom.
    Friel, R. J.
    Loughborough University, Loughborough, United Kingdom.
    Laser sintering of ceramic materials for aeronautical and astronautical applications2017In: Laser Additive Manufacturing: Materials, Design, Technologies, and Applications / [ed] Milan Brandt, Amsterdam: Woodhead Publishing Limited, 2017, p. 373-398Chapter in book (Other academic)
    Abstract [en]

    Ceramic products have been manufactured for many decades via conventional techniques such as extrusion, oven sintering, and casting. However, these methods have several inherent disadvantages with regard to the possible shape and structure, which limits their application range. The advent of laser additive manufacturing (LAM) is a key enabler in creating ceramic components with considerably greater design freedom. The technology is allowing the creation of ceramic components that not only meet the increasing material requirements of aero/astro applications but also provide new opportunities in terms of the complex structures that can now be produced. Ceramics represents a new frontier for these LAM systems – one with many challenges and research needs; however, the material properties that ceramics offer over polymers and metals make the additive manufacturing of ceramic components an enticing engineering opportunity for aerospace, astronautical and potentially many other technology areas. This chapter presents an overview of the state of the art of ceramic materials in LAM for aerospace and astronautic applications. Section 14.2 explains the fundamentals of ceramic materials and includes examples of their traditional manufacturing methods. Section 14.3 focuses on the application of ceramic materials to the challenging engineering realm of aeronautics and astronautics, accompanied by examples from their main application areas (eg, thermal and ballistic shielding). Section 14.4 goes into depth on LAM, explaining the challenges and implications of laser processing ceramics, the benefits of the approach and examples from the current state of the art. Finally, 14.5 Future developments, 14.6 Conclusions highlight some of the likely future developments in the area and conclude the chapter. © 2017 Elsevier Ltd. All rights reserved.

  • 272.
    Goulas, Athanasios
    et al.
    Wolfson School of Mechanical, Electrical & Manufacturing Engineering, Loughborough University, Loughborough, United Kingdom.
    Binner, Jon GP
    College of Engineering and Physical Sciences, University of Birmingham, Birmingham, United Kingdom.
    Engstrøm, Daniel S.
    Wolfson School of Mechanical, Electrical & Manufacturing Engineering, Loughborough University, Loughborough, United Kingdom.
    Harris, Russell A.
    Mechanical Engineering, University of Leeds, Leeds, United Kingdom.
    Friel, Ross J.
    MAX IV Laboratory, Lund University, Lund, Sweden.
    Mechanical behaviour of additively manufactured lunar regolith simulant components2019In: Proceedings of the Institution of mechanical engineers. Part L, journal of materials, ISSN 1464-4207, E-ISSN 2041-3076, Vol. 233, no 8, p. 1629-1644Article in journal (Refereed)
    Abstract [en]

    Additive manufacturing and its related techniques have frequently been put forward as a promising candidate for planetary in-situ manufacturing, from building life-sustaining habitats on the Moon to fabricating various replacements parts, aiming to support future extra-terrestrial human activity. This paper investigates the mechanical behaviour of lunar regolith simulant material components, which is a potential future space engineering material, manufactured by a laser-based powder bed fusion additive manufacturing system. The influence of laser energy input during processing was associated with the evolution of component porosity, measured via optical and scanning electron microscopy in combination with gas expansion pycnometry. The compressive strength performance and Vickers micro-hardness of the components were analysed and related back to the processing history and resultant microstructure of the lunar regolith simulant build material. Fabricated structures exhibited a relative porosity of 44–49% and densities ranging from 1.76 to 2.3 g cm−3, with a maximum compressive strength of 4.2 ± 0.1 MPa and elastic modulus of 287.3 ± 6.6 MPa, the former is comparable to a typical masonry clay brick (3.5 MPa). The additive manufacturing parts also had an average hardness value of 657 ± 14 HV0.05/15, better than borosilicate glass (580 HV). This study has shed significant insight into realising the potential of a laser-based powder bed fusion additive manufacturing process to deliver functional engineering assets via in-situ and abundant material sources that can be potentially used for future engineering applications in aerospace and astronautics. © 2018, IMechE 2018.

  • 273.
    Grandicki, Andreas
    Halmstad University, School of Business, Engineering and Science.
    Bearbetningsmaskin för fälgar i kolfiberkomposit2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The following thesis has been performed in cooperation with Koenigsegg Automotive AB, which develops, manufactures and sells high-performance sportscars. Koenigsegg offers rims made completely from carbon fiber composite, which yields substantial benefits in stiffness and weight compared to their traditional metal counterparts.

    After the manufacturing of the rims, some trimming is necessary in the contact surface between rim and tire. The purpose of this thesis has been to examine the possibility of performing the necessary trimming in-house in Ängelholm, by designing a special tool.

    The project began with a literature study, where possibilities and difficulties of machining carbon fiber composites were examined. As a result of the study, the manufacturing process turn-milling was chosen, and a number of concepts were generated. Through a series of evaluations, one concept was further developed to a final product.

    The suggested product is complete with calculations, analyses and drawings, which gives Koenigsegg a better insight of future possibilities. A solid foundation for future CE-marking has also been produced. The project has followed Fredy Olssons methods of Engineering Design.

  • 274.
    Graneskog, Axel
    et al.
    Halmstad University, School of Business and Engineering (SET), Biological and Environmental Systems (BLESS), Energiteknik.
    Gustafsson, Yngve
    Halmstad University, School of Business and Engineering (SET), Biological and Environmental Systems (BLESS), Energiteknik.
    Smart Control: En reaktion på EU:s ekodesignkrav2012Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    The purpose of this thesis is to assist the Swedish energy company NIBE Energy Systems in their studies of adaptive regulation applicable to electrical water heaters. Due to coming energy classifications of these appliances in the European Union, NIBE Energy Systems needs to use adaptive regulation, called Smart Control, to keep their products in the best possible energy class and remain competitive to the market. By using this Smart Control regulation a 2-3 % improve-ment of efficiency can be credited the system. This is a small number, but heavily needed, since the energy classes are based on the idea that the European Union is provided with electricity from coal condensate power resulting in a 40 % maximum efficiency. Furthermore, doing noth-ing will result in some water heaters not being approved to use on the market from 2015 due to low efficiency. The thesis is made out of three sections; product-/literature studies of products already commercially available using similar principles, data analysis on existing Smart Controlled water heater and recommendations to the company for future development of their own system. Limitations have been made through simplified calculations and thermodynamic assumptions. A conclusion can still be made from the thesis; electrical water heaters using Smart Control saves 10 - 15 % of electrical energy use today in a real world environment. Main sources to this thesis have been data analysis, Internet, brochures and conversations with the mentors.

  • 275.
    Gregorovic, Antonia
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    Anikina, Elizaveta
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    Konstruktion av lapputmatningsmaskin2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The vision of this thesis was to create a concept that can be used as a base for amachine construction. The purpose of this project was to use different methods todevelop a concept that on the best way meets the sat up requirements. This projecthas been divided into three stages/parts; principle, primary and the final solutionstage.This thesis has been conducted in collaboration with Västkustägg AB. It is aconstruction project designed to construct a machine that will automatically putlabels on the egg packages. Västkust AB wanted to automate this process. Thecompany has only tested this process earlier by an operator who did this jobmanually.We came up with different solution during this project. The assessments of theseconcepts were made after Olsson's (1995) method and together with Terje Olsson- our supervisor at the company, later during the project. During the last stage ofthis project we chose to go with one final concept for a further developing. Alldemands made by the company were followed throughout the working process.We managed to develop a machine containing few and simple components, whichat the same time are very functional for its purpose. The design of our machine isdifferent from other industrial machines and labeling machines which makes itunique in its own way. This machine is meant for labels of two standard types ofpaper A5 and A6.The calculations we made during this project have been done in Catia V5 and hasbeen verified. We had a clear image of how our ideas should be in the beginningof this project and we knew how we wanted them to be we used our own theoriesand approaches in practice. Our theories and ideas showed in our sketches andprototypes. This along with other methods led to our final concept.We had also built some prototypes to be able to see if our ideas work in practice.The prototype led to some changes in our concepts. It gave us experience inprototype creating, functionality of the ideas and other areas.

  • 276.
    Grimslätt, Tove
    et al.
    Halmstad University, School of Business, Engineering and Science.
    Freiholtz, Sofia
    Halmstad University, School of Business, Engineering and Science.
    SMAX: Smart clothing racks2018Independent thesis Basic level (degree of Bachelor), 180 HE creditsStudent thesis
  • 277.
    Grip, Andreas
    Halmstad University, School of Information Technology.
    Kraftmätning på cykelpedal2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report will describe the development of a subsystem for force measurement on bicycle pedals. The force is going to be used as a control parameter in a motor controller to control an electric motor on an electric bicycle. The report focuses on force measurement and will not process any control system. There has also been a survey of alternative power supplies to the circuit boards to be used in this project. Energy Harvesting has been investigated as an alternative source. The aim of the project is to measure the force applied on the pedal in a good way for use in a control system.This work resulted in that the force applied on the pedals was measured on the crank arms. The force was being measured by strain gauge sensors in a test rig designed in this project. The force signal can be used in the intended control system. This report has explained when, during a pedal stroke, the force should be measured. Processing of the signal will be done furthermore in the motor controller to fit the requirements set by the control system.

  • 278.
    Grouleff Öberg, Simon
    Halmstad University, School of Business, Engineering and Science.
    KNOXHULT: Utveckling av IKEAs nya lågpris kök för Nordamerika2016Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
  • 279. Gunnarsson, Love
    et al.
    Ljungström, Anton
    Rescue ladder2014Independent thesis Basic level (professional degree), 15 credits / 22,5 HE creditsStudent thesis
  • 280.
    Gustafsson, Per
    et al.
    Halmstad University, School of Business and Engineering (SET).
    Wisjö, Jari
    Halmstad University, School of Business and Engineering (SET).
    Vad påverkar mognadsgraden inför en implementering av SMED2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Globalization and growing competition are today placing increasing demands on organizations. To meet the tougher competition, it is common that companies implement various quality programs. These changes are seen as necessary measures in order to maintain market share and to be competitive. Introducing Lean tools and working on continuous improvement reduces the risk that production is shut down or moved to low-cost countries.

    In this thesis the authors have chosen to study one of these Lean tools used for setup time reduction. The tool is called SMED which stands for "Single Minute Exchange of Die" and aims to increase machine availability through more efficient tool change between different products. The thesis is a qualitative case study where the authors create an in-depth understanding of what it is that can affect the outcome. The key question that the authors seek to answer is: What influences the level of maturity before an implementation of SMED?

    Empirical data was collected through interviews and observations to answer the above problem. With the support of TQM (Total Quality Management), the authors have chosen to examine four areas and how they correlate to the outcome. The selected areas are referred to in this study as blocks and are: Implementation, Leadership, Competence and Corporate Culture. The correlation was performed using a regression analysis program Minitab. There the result shows that all four blocks influence, but have different effects on the outcome. The two most influential are Leadership and Corporate Culture that are responsible for a total of 84 %. A result that according to the authors met the survey's expectations and that could be confirmed by this study.

    The authors believe that this study can provide useful information and knowledge before implementation of SMED. As this thesis includes interviews and observations from ten companies.

  • 281.
    Gustavsson, Julia
    et al.
    Halmstad University, School of Business, Engineering and Science.
    Albertsson, Klara
    Halmstad University, School of Business, Engineering and Science.
    CASEUS: Din hjälpande hand2017Independent thesis Basic level (university diploma), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    Development and modernization takes place all the time and everywhere in today's society.

    Although we handle and slices hard cheese in the same way that we did decades ago. The way

    we handle cheese nowadays is not only unhealthy, but can also be a difficult moment for

    some people.

    The goals to develop a functional, modern and food-approved kitchen tool adapted to today’s

    society are the main factors for this bachelor thesis. Along with stakeholders for the project,

    the requests and demands set up for the prototype progressively have been worked out. Wellknown

    methods and market surveys have been used to ensure the need of the product.

    Researches in relevant subjects have also shown that the market is in need of a new product.

    The product called CASEUS has after studies shown to have a broad target group. The name

    CASEUS, came from the Latin word for cheese (Caseus) and from the English word case, as

    the product will be like a case around the cheese. The kitchen tool is designed with a simple

    mechanical solution, in a hygienic material. The handle is designed according to EU: s

    standard dimensions for handles. Therefore, it is considered suitable for the majority of the

    population in Sweden. Thus, there is a market for the product both at hotels and restaurants, as

    well as in private households.

    In the final stage of the project a prototype of CASEUS has been produced by Havd Group,

    which is a stakeholder in the project. The prototype has been funded by a scholarship and

    contributions from ALMI Business partner.

    To be able to continue with CASEUS after the end of the project, new possible working paths

    have been investigated. With promotion, more scholarship or a collaboration with an existing

    manufacturer in the industry, the project team hopes to be able to get CASEUS out on the

    market.

  • 282.
    Gustavsson, Martin
    et al.
    Halmstad University, School of Information Technology.
    Frimodig, Viktor
    Halmstad University, School of Information Technology.
    Virtual Prototyping and Physical Validation of an Inverted Pendulum: "Sea-Calf Bot"2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The work is motivated by the goal of linking reality and model, and to see if there is an opportunity to develop an inexpensive educational tool for training in cyber-physical systems.

    This project has investigated the possibilities to build a cheap inverted pendulum with controller and connect this with the modeling language Acumen. Acumen models is used for comparison with the actual prototype.

    To solve these problems has a 3D printer been used to create hardware, Arduino UNO for control and Raspberry Pi for enable communication with Acumen over WLAN.

    The result was a cheap inverted pendulum, which can be built for a cost around 750 SEK. Graphs created in Acumen and from data collected from sensors can be analyzed.

    With a model of the inverted pendulum system, the results show that Acumen can be used in the development of cyber-physical systems. There are differences between model and reality but also similarities.

  • 283. Gutestam, Kim
    et al.
    Magnusson, Mattias
    Coymo2014Independent thesis Basic level (professional degree), 15 credits / 22,5 HE creditsStudent thesis
  • 284. Halili, Jonas
    et al.
    Kurtti, Oskar
    FlowGoLow – Energieffektivisering för hemmet2013Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
  • 285. Hallström, Sofia
    et al.
    Albderi, Safa
    Sladdfri laddningsstation för elbilar: Uppdragsgivare: Elonroad AB2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • 286. Halvarsson, Erik
    et al.
    Norrman, Marcus
    Bluetooth-styrning av skytteställ2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Today many shooting ranges uses outdated systems for controlling their shooting targets. These systems may be inconvenient to both use and to program. During this project a new system for controlling shooting targets is developed, togheter with a rotation target prototype for air pistol shooting.

    The project aims to allow more members to easily learn how to use and to program their system. A system that is easy to use will also free more time for a shooting leader to superintend the shooters.

    The core part of the system is its reciver, which is epuipped with a Bluetooth Low Energy module to establish a connection with a remote handheld device.

    Both the reciever and rotation target prototype is developed. Different strategies for meeting the specified requirements are evaluated.

    The result is a system that recievs a program sequence from a handheld unit and controls the rotation target prototype as specified by the user.

  • 287.
    Hammar, Mikael
    et al.
    Halmstad University, School of Business and Engineering (SET), Biological and Environmental Systems (BLESS), Energiteknik.
    Huszág, Máté
    Halmstad University, School of Business and Engineering (SET), Biological and Environmental Systems (BLESS), Energiteknik.
    Geotermi i Ungern: Undersökning av Ungerns energisituation inriktat på geotermi samt kapacitetsfaktorn för det största geotermiska värmeverket i Mellaneuropa.2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Hungary’s share of renewable energy in 2010 was 7.9 %, and their renewable energy goal for 2020 is 14.65 %. Geothermal energy is one option that could help to achieve the goal, since Hungary has favorable bedrock, the temperature gradient is above average and thepermeability is high. Today Hungary is importing just over half of its primary energy supply. Because of political conflicts between nations Hungary wants to expand its own production of energy. One of the major investments implemented was to build the largest geothermal heating plant in central Europe, located in Miskolc. This degree theses aims is to raise the capacity factor for this heating plant. To achieve this objective, a survey of how grain dryers and absorption chillers could increase the heat load in the summer has been performed. With grain dryers that only dries wheat, the capacity factor for the geothermal heating plant in Miskolc increased by 2.6 % and by 4.4 % for the absorption chiller. Although surveys have been carried out for a specific case the idea can be implemented in other heating plants.

    Keywords: Capacity factor, geothermal energy, wheat dryers and absorptions chiller.

  • 288.
    Hammarström, Fanny
    et al.
    Halmstad University, School of Business, Engineering and Science.
    Erlandsson, Jonas
    Halmstad University, School of Business, Engineering and Science.
    Gröna granulat2016Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
  • 289. Hansen, Hansen
    et al.
    Ölmén, Henrik
    Equipment changeover reduction of a production line2018Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The growing competition for manufacturing companies is placing increased demand on fulfilling customer requirements with as high quality as possible as quick as possible. To meet the tougher competition, it is common that companies implement various tools and methods such as Lean Manufacturing, Continuous Improvement and Single Minute Exchange of Dies (SMED). Implementing these helps to reduce the risk of production failures while increasing efficiency thus increasing profit.  This thesis brings up the implementation of a tool within Lean Manufacturing called SMED to a production line with the aim to increase the machine availability through reduction of the equipment changeover.  The thesis is a qualitative case study where the authors use interviews, observation and time measurement to gather relevant data which are then analysed for the goal of this thesis which is to reduce the complete equipment changeover time of the production line in Ämnesverkstaden. All the relevant data which was collected resulted in an implementation of a SMED mind-set and an instruction manual with a complementary list of necessary changes.  The authors believe that this study can provide useful information and knowledge when introducing SMED as well as an approach the operators can use in the future to help reduce the equipment changeover.

  • 290.
    Hansson, Kaisa
    et al.
    Halmstad University, School of Business, Engineering and Science.
    Rosén, Sara
    Halmstad University, School of Business, Engineering and Science.
    Återanvändning av filtmaterial2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The thesis work is a collaboration with the company Nordifa AB. The work is about making use of the waste material Nordifa gets after manufacturing different products and thereby helping the company to contribute to a cleaner environment. With the waste material the company's range of products will be developed. 

    By weighting requirements and function, the students presented a product in terms of the result. This required a new type of tool in three parts to use in the pressing machine. Drawings for this was developed and sent to Plåtcenter who created the prototype tool. The students have used a design process adapted to the project, which gave the opportunity to focus on what’s relevant which in this case meant finding an optimal production process. 

    The process gave five solution proposals, that after the weighting of requirements led to one which was chosen for continued development. The final concept became a production process in which all waste is used and which provides a design that can be used in multiple material rolling processes for different products. With the help of Rapid Granulator AB, the proposal could become a prototype, as they helped to test grind of the material, which led to the result. This solution also minimized manual work, and gives all staff the opportunity to understand and perform the work process.

    A final concept has been produced and when the project has been completed, the prototype tool has been developed and tested at Nordifa. Further work exists and is based primarily on a decision by Nordifa if they choose to make use of the proposal.

  • 291.
    Hedenskog, Hannes
    et al.
    Halmstad University.
    Swensson, Karl-Philip
    Halmstad University.
    Xlight-Retro: En lampa för offentliga inomhusmiljöer2015Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
  • 292.
    Hedén, Niclas
    Halmstad University, School of Business and Engineering (SET).
    Låsning till spolkarslock2012Independent thesis Basic level (professional degree), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    Since 2007, I´ve been working in the steel industry in a place called “SSAB”. That’s why itseemed right to contact them for this thesis.The SSAB concern is global, but SSAB Sweden involves raw steel producing in Luleå, heavyplate producing in Oxelösund, and sheet metal producing in Borlänge.

  • 293.
    Helgesson, Fredrik
    Halmstad University, School of Business, Engineering and Science.
    Konstruktion av "log strike"-testrigg för utombordsmotorer2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The goal for this project, carried out with directions from Cimco Marine AB, has been to design a concept construction for a “log strike” testrig for outboard motors. Cimco Marine AB has developed a diesel powered outboard motor mainly for professional use. The diesel engine used is an engine from the automotive industry that has been converted for marine use. The engine is located on a gearbox and underhouse that transfer the power via two belts down to the propeller.

    A “log strike” occurs when a boat with an outboard motor runs over a log floating in the surface of the water. When this happens a collision between the part of the outboard motor under the waterline and the log is a fact. To ensure that the outboard motor manufactured by Cimco Marine AB manage the loads a high speed log strike produces, they want a test rig to test this. One can compare this test with the crash tests performed in the vehicle industry.

    In the beginning of the project, time was spent on research and information gathering. It was then decided that the rig should consist of a sled that is propelled against the underhouse of the outboard motor. After this, the project was split in smaller units and every unit was considered separately before they were put together again as a whole. The construction project has followed the design method developed by Fredy Olsson.

    The end result is a concept design of a “log strike”- test rig, adapted to the requirements set up by Cimco Marine AB. 

  • 294.
    Hellberg, Joel
    et al.
    Halmstad University, School of Business, Engineering and Science.
    Karlsson, Adam
    Halmstad University, School of Business, Engineering and Science.
    Utveckling av uterumsparti med brutenköldbrygga2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of the thesis has been that in cooperation with Sweden today's leading distance and ecommerce,Skåne Byggvaror AB, construct and design a modern and cost effective sliding doorsystem with thermal breaks in the category 'best'. Skånska Byggvarors business idea is to offercustomers the right quality at the right price with free delivery to the door. Today the companymanufactures 4 of 5 sliding door systems themselves and only the "best" model is manufacturedexternally. The goal of this project is the result to be good enough so the new system will be able toreach the company's production in Bjuv and then sold at Skånska Byggvarors website and in theirstores around the Skandinavien.The outcome of the project was a product of consensus with the company's business concept thatmet the specifications and offered little thereto. After being in contact and requested bids fromdifferent suppliers, it could also be said that the company could increase the product's annualearnings by about 4 million by producing and introducing our new sliding door systems.

  • 295.
    Helmersson, Linnéa
    et al.
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    Linder, Tommy
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    Komprimering av medicinskt avfall2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Hälsoteknikcentrum Halland are working with different projects to find new technical solutions for problems in healthcare, they brought up the problem with the medical waste disposal together with representatives from Hallands Hospital in Halmstad. Today the nurses and caretakers experience the medical waste disposal as unpleasant since it means they have to deal with contaminated waste, the hospital is eager to develop a product that compresses the waste and improves the work environment for its employees.

    The product shall compress bags of 150 liters of medical waste, this shall be done in a user-friendly way based on specific requirements, the specification was developed in consultation with hospital employees. Through different experiments and examination of different methods, the most appropriate method to compress the bags were to press them. After developing the idea to a functioning method a prototype was made. The prototype uses pneumatics to press the air out of the bag, the contaminated air is filtered through an absolute filter and the bag is compressed over 50%.

    This graduate thesis has included a number of tasks, to read up on different areas, problem solving, construction and innovation. This has resulted in a well functioning prototype that meets the requirements.

  • 296.
    Hemhagen, Anton
    et al.
    Halmstad University, School of Business, Engineering and Science.
    Hansen, Niklas
    Halmstad University, School of Business, Engineering and Science.
    Konstruktion av monteringsverktyg2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis has been done in cooperation with Lindab AB. The goal of the project is to create a tool wich aims to help the assembly of a ventilation silencer because it takes to much effort from the operators and is a non-ergonomic way of work.

    The construction method which will be used in this thesis is developed by Doctor Fredy Olsson in his thesis Systematical Construction at the instution of Mechanical Construction at Lunds Tekniska Högskola.

    The construction stages which is applied in this project are principle och primary construction. These stages will help the authors to generate a koncept of an assembly tool.

    The koncept has been adjusted several times after discussions with operators and supervisors to achieve the purpose of the project. These thoughts has been analysed and validated with intervies and FEM-analysis.

    The summary of the project is a developed koncept and support to complete the problem definition. With the limited amount of time and the need from Lindab to prioritize its resources elsewhere a final prototype was not able to be manufactured.

  • 297.
    Hentz, Jacob
    et al.
    Halmstad University.
    Löfstrand, Pauline
    Halmstad University.
    Persson, Christoffer
    Halmstad University.
    Symaskinsbord2013Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    Abstract

    We have been honored to work with a company called Frimeko AB. Frimeko is located in Halmstad where they make and sell furniture for school and office environment. Our task is to construct a new, more modern sewing machine table for schools. The task is to use the same function as before, ease the storage and production of sewing machine.

    Efforts to develop the new sewing machine table resulted in that we came up with an innovative design that the company is pleased with.

    During this project the group has used the method from “Fredy Olsson Konstruktion” 

  • 298.
    Hillberg, Alexander
    et al.
    Halmstad University, School of Business, Engineering and Science.
    Olmarker, Marcus
    Halmstad University, School of Business, Engineering and Science.
    Optimization of Flexplate2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    From 2019, all new Volvo Powertrains will be electrified, also including ICE based Powertrains. In the ICE based Powertrains with automatic transmission, a flexplate is connecting the crank shaft to the automatic transmission to transfer the power. The flexplate needs to handle torque peaks from the combustion, crank shaft whirl and axial forces generated by the torque converter. The combustion torque load is maximized at every ignition, but the load is also dependent on engine speed/load and gearbox shifts. All these loads applied to the flexplate means that the plate will be exposed to high stress levels. These high levels of stress make the flexplate more likely to break and thus, shorten its lifespan. Therefore, the objective of this thesis was to generate new optimized design proposals of the plate with minimized stress levels using the method Simulation Driven Design. Also, to understand the result, a parametrical study was performed using Design of Experiments. Using Simulation Driven Design, several concepts were generated but only two showed valid results, and they were optimized using parametrical optimization and Design of Experiments in Catia V5. Also, an attempt at a topological optimization was performed in Inspire, but the model was to complex and could not be accurately replicated in the program, making the topological optimization impossible to do. With a combination of parametrical optimization and Design of Experiments, the two concepts showed a reduced stress level of 16.4% and 11.1% compared to the original design. They also showed an increase in deformation and a slight decrease in weight. Knowing this, a conclusion could be made that Simulation Driven Design is a great method to use in product development. The results show that the combination of parametrical optimization and Design of Experiments can be used efficient during the optimization process in product development.

  • 299.
    Hjalmarsson, Simon
    et al.
    Halmstad University.
    Svensson, Simon
    Halmstad University.
    Granulatmatad prototypmaskin2015Independent thesis Basic level (university diploma), 80 credits / 120 HE creditsStudent thesis
  • 300.
    Holmberg, Ulf
    et al.
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS).
    Svensson, Wolfgang
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS).
    A pneumatic loudspeaker for intensive sounds2001In: ECC : 2001 European Control Conference: 4-7 September 2001, New York, NY: Institute of Electrical and Electronics Engineers (IEEE), 2001, p. 2257-2260, article id 7076260Conference paper (Refereed)
    Abstract [en]

    A pneumatic loudspeaker for intensive sounds is presented. It operates by modulation of air from over- and underpressure reservoirs, as opposed to siren-like loudspeakers that use compressed air only. The symmetric construction makes the behavior more linear both with respect to aperture amplitudes and frequency bandwidth. Therefore, it may be used as secondary source in industrial active noise control problems where generation of large volume velocities are necessary. It is also shown that a Hammerstein model can model the loudspeaker over a wide frequency band. © 2001 EUCA.

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