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Valorisation of Waste Heat in Existing and Future District Heating Systems

Author

Listed:
  • Ieva Pakere

    (Institute of Energy Systems and Environment, Faculty of Electrical and Environmental Engineering, Riga Technical University, Azenes Street 12/1, LV-1048 Riga, Latvia)

  • Dagnija Blumberga

    (Institute of Energy Systems and Environment, Faculty of Electrical and Environmental Engineering, Riga Technical University, Azenes Street 12/1, LV-1048 Riga, Latvia)

  • Anna Volkova

    (School of Engineering, Department of Energy Technology, Tallinn Technical University, Ehitajate Tee 5, 19086 Tallinn, Estonia)

  • Kertu Lepiksaar

    (School of Engineering, Department of Energy Technology, Tallinn Technical University, Ehitajate Tee 5, 19086 Tallinn, Estonia)

  • Agate Zirne

    (Institute of Energy Systems and Environment, Faculty of Electrical and Environmental Engineering, Riga Technical University, Azenes Street 12/1, LV-1048 Riga, Latvia)

Abstract

To recover thermal energy from different sources, its quality and possibilities for utilisation are essential. The wide range of engineering solutions includes a direct connection to the district heating (DH) system and the integration of low-quality heat using heat pumps to increase the temperature level of recoverable heat. Therefore, this article compares waste heat valorisation strategies for integration into existing DH networks, low-temperature DH, and ultra-low heat supply systems using the multi-criteria assessment method. In addition, a local scale assessment was performed to identify the waste heat role in existing RES-based DH systems. The results show that the highest waste heat valorisation rate could be reached when integrated into low-temperature DH systems due to high waste heat potential and suitable temperature conditions. However, a local scale assessment shows a significant impact on the already implemented solar technologies, as waste heat could cover around 70% of the summer heat load.

Suggested Citation

  • Ieva Pakere & Dagnija Blumberga & Anna Volkova & Kertu Lepiksaar & Agate Zirne, 2023. "Valorisation of Waste Heat in Existing and Future District Heating Systems," Energies, MDPI, vol. 16(19), pages 1-22, September.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:19:p:6796-:d:1246848
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    1. Vojtěch Turek & Bohuslav Kilkovský & Ján Daxner & Dominika Babička Fialová & Zdeněk Jegla, 2024. "Industrial Waste Heat Utilization in the European Union—An Engineering-Centric Review," Energies, MDPI, vol. 17(9), pages 1-29, April.

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