A heat pump system for simultaneous comfort floor cooling and domestic hot water

Tingting Zhu*, Jierong Liang, Jan Eric Thorsen, Oddgeir Gudmundsson, Wilko Rohlfs, Brian Elmegaard

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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The benefit of ultra-low temperature district heating systems (ULTDH) is their low supply temperature, which increases the heat generation efficiency and significantly reduces the heat loss of the DH network. The present study proposed a dual-effect heat pump system, which in combination of the ULTDH network, fulfills both, comfort floor cooling/heating and domestic hot water (DHW) demands. Depending on the operation the ULTDH system is used as a heat source, DHW preparation, or as a heat sink in cooling operation mode. The application potential of the proposed heat pump unit used for comfort floor cooling has been validated.
The cooling experimental tests were performed under designed conditions with fixed heat source temperature (22 ℃) and different heat sink temperatures, simulating either DHW preparation or delivering the surplus heat to the ULTDH network. The coefficient of performance (COP) of the dual-effect heat pump system varied from 2.22 to 2.81 in cooling mode, and from 3.0 to 3.4 in heating mode. The cooling capacity ranged from 2.9 kW to 3.4 kW and heating capacity ranged from 3.8 kW to 4.4 kW.
Original languageEnglish
Title of host publication14th IEA Heat Pump Conference 2023
Publication statusPublished - 15 May 2023
Event14th IEA Heat Pump Conference 2023: Heat Pumps – Resilient and Efficient - Chicago, United States
Duration: 15 May 202318 May 2023
Conference number: 14


Conference14th IEA Heat Pump Conference 2023
Country/TerritoryUnited States
Internet address


  • 2023 OA procedure


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