Space heating with ultra-low-temperature district heating - a case study of four single-family houses from the 1980s

Dorte Skaarup Østergaard, Svend Svendsen

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Abstract

District heating is predicted to play a large role in the future fossil free energy system. Apart from providing energy savings by utilizing surplus heat, the district heating system also provides flexibility to fluctuating electricity generation by bridging the electricity and the heating sector. These benefits can be maximized if district heating temperatures are lowered as much as possible. In this paper we report on a project where 18 Danish single-family houses from the 1980s were supplied by ultra-low temperature district heating with a supply temperature as low as 45 degrees C for the main part of the year. The houses were heated by the existing hydraulic radiator systems, while domestic hot water was prepared by use of district heating and electric boosting. This paper evaluated the heating system temperatures that were necessary in order to maintain thermal comfort in four of the houses. First the four houses were modelled in the building simulation tool IDA ICE. The simulation models included the actual radiator sizes and the models were used to simulate the expected thermal comfort in the houses and resulting district heating return temperatures. Secondly measurements of the actual district heating return temperatures in the houses were analysed for different times of the year. The study found that existing Danish single-family houses from the 1980s can be heated with supply temperatures as low as 45 degrees C for the main part of the year. Both simulation models and test measurements showed that there is a large potential to lower the district heating temperatures. (C) 2017 The Authors. Published by Elsevier Ltd.
Original languageEnglish
JournalEnergy Procedia
Volume116
Pages (from-to)226-235
Number of pages10
ISSN1876-6102
DOIs
Publication statusPublished - 2017
Event15th International Symposium on District Heating and Cooling - Seoul, Korea, Republic of
Duration: 4 Sep 20167 Sep 2016
Conference number: 15

Conference

Conference15th International Symposium on District Heating and Cooling
Number15
CountryKorea, Republic of
CitySeoul
Period04/09/201607/09/2016

Keywords

  • Ultra-low-temperature district heating
  • Radiator
  • IDA ICE
  • Heating power
  • Heat demand

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