Change in heat load profile for typical Danish multi-storey buildings when energy-renovated and supplied with low-temperature district heating

Maria Harrestrup, Svend Svendsen

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Abstract

Denmark has a long-term objective of being free of fossil fuels by 2050 with the energysupply-mix for buildings being free of fossil fuels by 2035. Hence energy consumption from existing buildings needs to be decreased concurrent with the conversion from fossil-fuel supply into renewable-energy (RE) supply. When end-use-savings are implemented in buildings concurrent with the application of low-temperature district heating (DH) (supply=55°C, return=25°C) the heat demand profiles for the individual buildings will change. The reduction in peak load is important since it is the dimensioning foundation for the future DH-systems and in order to avoid oversized RE-based capacity, a long-term perspective needs to be taken. The results show that it is possible to design the DH-plants based on an average value of the 5 days with highest daily average loads without compromising with indoor thermal comfort. Applying low-temperature DH to existing buildings without changing the heating system imply reduced radiator performance, and it is of great importance that acceptable comfort temperatures can still be provided. The results indicate that it is possible to apply low-temperature DH for approximately 90% of the year without compromising thermal comfort when energy renovations are carried out.
Original languageEnglish
Title of host publicationProceedings of the 4th International Conference on Renewable Energy Sources & Energy Efficiency
Number of pages12
Publication date2013
Publication statusPublished - 2013
Event4th International Conference on Renewable Energy Sources & Energy Efficiency: New Challenges - Nicosia, Cyprus
Duration: 6 Jun 20137 Jun 2013
Conference number: 4

Conference

Conference4th International Conference on Renewable Energy Sources & Energy Efficiency
Number4
CountryCyprus
CityNicosia
Period06/06/201307/06/2013

Keywords

  • Energy renovation
  • End-use savings
  • Yearly energy demand
  • Peak load
  • Heat load profile
  • Lowtemperature district heating

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