Introduction of new decentralised renewable heat supply in an existing district heating system

Miika Rämä*, Mikko Wahlroos

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

33 Citations (Scopus)
216 Downloads (Pure)


The effects of new heat pump and solar collector capacity in an existing district heating system are investigated by using Helsinki as a case study. Existing heat supply consists of combined heat and power plants, boilers and large-scale heat pumps. Also, the potential benefit of low distribution temperatures is evaluated. Both an outdoor temperature dependent supply temperature between 80 and 110 °C and a constant supply temperature of 65 °C are considered for distribution. EnergyPro modelling tool is utilised, providing information on optimal operation of heat supply. Changes in heat supply are studied with emissions of the system and techno-economic performance of the new heat sources evaluated. Results indicate that CHP based heat production is set to decrease 68–73% by 2030. Heat pumps represent the most interesting option for heat supply with good performance on all economic, emissions and energy efficiency viewpoints. Low temperature distribution improves the performance of the system by 4% in both costs and as emission reductions compared to normal distribution temperatures.

Original languageEnglish
Pages (from-to)68-79
Number of pages12
Publication statusPublished - 1 Jul 2018
MoE publication typeA1 Journal article-refereed


  • Combined heat and power
  • District heating
  • Energy system modelling
  • Heat pumps
  • Low temperature distribution
  • Solar collectors


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