hh.sePublications
Change search
CiteExportLink to record
Permanent link

Direct 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
Pipe Sizing for Novel Heat Distribution Technology
Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).ORCID iD: 0000-0003-2885-0923
Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).ORCID iD: 0000-0001-9069-0807
2019 (English)In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 12, no 7, article id 1276Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
Basel: MDPI, 2019. Vol. 12, no 7, article id 1276
Keywords [en]
low temperature, district heating, pressure gradients, three-pipe system, 4GDH-3P
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:hh:diva-39198DOI: 10.3390/en12071276ISI: 000465561400093Scopus ID: 2-s2.0-85065515173OAI: oai:DiVA.org:hh-39198DiVA, id: diva2:1302256
Projects
TEMPO
Funder
EU, Horizon 2020, 768936Available from: 2019-04-04 Created: 2019-04-04 Last updated: 2020-02-18Bibliographically approved
In thesis
1. Low-temperature District Heating: Various Aspects of Fourth-generation Systems
Open this publication in new window or tab >>Low-temperature District Heating: Various Aspects of Fourth-generation Systems
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

With decreasing heat demand and less availability of high-temperature heat supply in future energy systems, the current district heating systems may experience increased competition on the heat market. A viable option to mitigate increasing competition is to operate systems with lower temperature levels, and the most conceivable way to achieve lower temperature levels is to decrease return temperatures.In this thesis, aspects of improvements in district heating systems are assessed. Three aspects, in particular, have been analysed. These are integration between energy systems, improvements in heat distribution technology, and economic benefits of low-temperature district heating systems.An increasing interest in integrating different energy systems has been prompted by the rapid introduction of intermittent renewable electricity supply in the energy system. Large-scale conversion of power to heat in electric boilers and heat pumps is a feasible alternative to achieve the balancing capacities required to maintain system functioning. Analysis of the unique Swedish experience using large heat-pump installations connected to district heating systems shows that, since the 1980s, 1527 MW of heat power has been installed, and about 80% of the capacity was still in use in 2013. Thus, a cumulative value of over three decades of operation and maintenance exists within Swedish district heating systems.Increased competition prompted by changes in the operation environment necessitates improved heat distribution. This thesis focuses on three system-embedded temperature errors: first, the temperature error that occurs due to recirculation in distribution networks at low heat demands; second, the temperature error that occurs due to hot-water circulation in multi-family buildings; third, the temperature error that occurs due to lower heat transfer than is possible in heat exchangers (i.e. too-short thermal length). To address these temperature errors, three technology changes have been proposed (i) a three-pipe distribution network to separate the recirculation return flow from the delivery return flow, (ii) apartment substations to eliminate hot-water circulation use, and (iii) improved heat exchangers for lower return temperatures. The analysis of the proposed changes indicates annual average return temperatures between 17°C and 21°C.The final analysed aspect is the economic benefits of low-temperature district heating. It was identified that strong economic motives for lower operating temperatures in future heat supply exist, whereas the economic motives are significantly weaker for the traditional heat supply.The five papers presented in this thesis are related to future district heating systems through the five abilities of fourth-generation district heating (4GDH), which are documented in the definition paper on 4GDH.

Place, publisher, year, edition, pages
Lund: Lund University, 2019. p. 31
Keywords
District heating, low temperature, three-pipe systems, 4GDH-3P
National Category
Energy Engineering
Identifiers
urn:nbn:se:hh:diva-41080 (URN)978-91-7895-316-5 (ISBN)978-91-7895-317-2 (ISBN)
Public defence
2019-12-11, M:B, M-huset, Ole Römers väg 1, Lund, 13:15 (English)
Opponent
Supervisors
Note

ISRN: LUTMDN/TMHP-19/1153-SE. I publikationen felaktigt: ISSN 0282-1990

Available from: 2020-02-18 Created: 2019-12-03 Last updated: 2020-02-18

Open Access in DiVA

Pipe Sizing for Novel Heat Distribution Technology(1800 kB)77 downloads
File information
File name FULLTEXT01.pdfFile size 1800 kBChecksum SHA-512
f9182c13ec5e7c33e4e1fe239b6d550f3527d6c12c083cc6f5f910ecaf9daea49fbea9573a93b678834d2b3ec030a3cb77b96d4aa5f688a2da0311c5df582092
Type fulltextMimetype application/pdf

Other links

Publisher's full textScopus

Authority records BETA

Averfalk, HelgeOttermo, FredricWerner, Sven

Search in DiVA

By author/editor
Averfalk, HelgeOttermo, FredricWerner, Sven
By organisation
The Rydberg Laboratory for Applied Sciences (RLAS)
In the same journal
Energies
Energy Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 77 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 188 hits
CiteExportLink to record
Permanent link

Direct 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