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Impact of Domestic Hot Water Systems on District Heating Temperatures
Dalarna Univ, Sweden.
Umea Univ, Sweden.
Linköping University, Department of Management and Engineering, Energy Systems. Linköping University, Faculty of Science & Engineering.
2019 (English)In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, ENERGIES, Vol. 12, no 24, article id 4694Article in journal (Refereed) Published
Abstract [en]

When buildings become more energy effective, the temperature levels of district heating systems need to be lower to decrease the losses from the distribution system and to keep district heating a competitive alternative on the heating market. For this reason, buildings that are refurbished need to be adapted to suit low-temperature district heating. The aim of this paper is to examine whether four different energy refurbishment packages (ERPs) can be used for lowering the temperature need of a multi-family buildings space heating and domestic hot water (DHW) system as well as to analyse the impact of the DHW circulation system on the return temperature. The results show that for all ERPs examined in this study, the space heating supply temperature agreed well with the temperature levels of a low-temperature district heating system. The results show that the temperature need of the DHW system will determine the supply temperature of the district heating system. In addition, the amount of days with heating demand decreases for all ERPs, which further increases the influence of the DHW system on the district heating system. In conclusion, the DHW system needs to be improved to enable the temperature levels of a low-temperature district heating system.

Place, publisher, year, edition, pages
MDPI, 2019. Vol. 12, no 24, article id 4694
Keywords [en]
district heating; energy efficient refurbishment; building simulation; low-temperature heating; domestic hot water
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:liu:diva-163377DOI: 10.3390/en12244694ISI: 000506918400087Scopus ID: 2-s2.0-85077015857OAI: oai:DiVA.org:liu-163377DiVA, id: diva2:1391063
Note

Funding Agencies|industrial post-graduate school Reesbe; Knowledge Foundation (KK-stiftelsen); AB Borlange Energi; AB Stora Tunabyggen

Available from: 2020-02-03 Created: 2020-02-03 Last updated: 2020-02-18Bibliographically approved

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