Valorisation of Waste Heat in Existing and Future District Heating Systems

Ieva Pakere (), Dagnija Blumberga, Anna Volkova, Kertu Lepiksaar and Agate Zirne
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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

Energies, 2023, vol. 16, issue 19, 1-22

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.

Keywords: district heating; waste heat; low-temperature heat sources (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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