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IIR document

CO₂ heat pump in high-temperature district heating plant.

Number: 0129

Author(s) : EGGEN G., SKINNES K., ENGEN M., INGEBRIGTSEN M., SMEDEGARD O. O.

Summary

In 2019, an oil-fired boiler was replaced by a ground-source CO₂ heat pump system in a military facility in Norway. The facility was heated by a district heating plant with forward temperatures up to 80 °C, and return temperatures varying from 35 °C to 55 °C. These relatively high return temperatures result in low COP for the CO₂ heat pump. Nevertheless, CO₂ was chosen as refrigerant for the heat pump because the high forward temperature was a serious obstacle for the alternative HFO1234ze heat pump system. The CO₂ heat pump system was competitive with regard to energy savings as well as profitability compared with the alternative HFO heat pump.
The CO₂ heat pump system has performed well, and the energy savings have been greater than expected. One of the reasons for that is due to the implemented measures in the district heating network in order to reduce the district heating water return temperatures.

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Pages: 6 p.

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Details

  • Original title: CO₂ heat pump in high-temperature district heating plant.
  • Record ID : 30029727
  • Languages: English
  • Subject: Technology
  • Source: 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants (GL2022). Proceedings. Trondheim, Norway, June 13-15th 2022.
  • Publication date: 2022/06/13
  • DOI: http://dx.doi.org/10.18462/iir.gl2022.0129
  • Document available for consultation in the library of the IIR headquarters only.

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