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

Miika Rämä, Mikko Wahlroos

    Research output: Contribution to journalArticleScientificpeer-review

    50 Citations (Scopus)


    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
    Publication statusPublished - 1 Jul 2018
    MoE publication typeA1 Journal article-refereed


    The authors would like to acknowledge the EU Horizon 2020 project mySMARTLife [731297], Fortum Foundation [grant numbers 201500047, 201600076] and the STEEM project of Aalto Energy Efficiency Programme for financial support for this work.


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


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