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Exergy analysis of network temperature levels in Swedish and Danish district heating systems
Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Energiteknik.
Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Energy Science.ORCID iD: 0000-0001-9069-0807
2015 (English)In: Renewable energy, ISSN 0960-1481, E-ISSN 1879-0682, Vol. 84, 106-113 p.Article in journal (Refereed) Published
Abstract [en]

Exergy concept is applied on district heating systems with different network temperature levels in their distribution networks. These district heating systems use a combination of renewables and heat recovery from other primary processes. The aim is to show simplicity and value of using exergy concept when comparing current and future temperature levels. Both the traditional exergy factor and the novel exergy utilisation rate are used in these analyses. Exergy utilisation rate expresses the ratio between the exergy delivered to customer heating systems and the exergy content in heat supply input to the distribution network. The analyses are performed on four different generations of district heating technologies, two national groups of district heating systems in Denmark and Sweden for revealing variations among systems, and two municipal systems for revealing variations within systems. The main conclusions are simplifications can be introduced in order to analyse the network temperature levels, current exergy factors reveal that current temperature levels can be reduced, and that almost two thirds of the exergy content in heat supply input are lost in the heat distribution chain. These conclusion will be vital input in developing the future fourth generation of district heating systems using both renewables and heat recovery. © 2015 Elsevier Ltd.

Place, publisher, year, edition, pages
Kidlington: Pergamon Press, 2015. Vol. 84, 106-113 p.
Keyword [en]
Exergy factor, Exergy utilisation rate, District heating, 4GDH
National Category
Energy Systems
Identifiers
URN: urn:nbn:se:hh:diva-29505DOI: 10.1016/j.renene.2015.06.001ISI: 000362618900012Scopus ID: 2-s2.0-84946473498OAI: oai:DiVA.org:hh-29505DiVA: diva2:856016
Available from: 2015-09-23 Created: 2015-09-23 Last updated: 2016-11-24Bibliographically approved

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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