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Improvement of large CO2 heat pumps’ efficiency for district heating applications using dedicated mechanical subcooling.

Number: 0624

Author(s) : DELETRE P. J. E., KRISTOFERSSON J., RASMUSSEN L. O., CHRISTENSEN K. G.

Summary

CO2 heat pumps are increasingly being used in the field of heating, ventilation, and air conditioning (HVAC) due to the thermophysical properties and low GWP of this natural refrigerant. In case of applications such as district heating, a high return temperature on the water can cause the performance of the system to drop. This research investigates the effect of dedicated mechanical subcooling (DMS) using an isobutane vapor compression cycle on the coefficient of performance (COP) and capacity of the heat pump. A numerical model was developed using Engineering Equation Solver (EES) to simulate the heat pump. Two different integration designs, direct and indirect DMS, were examined and compared to a base case. Results from the simulations showed that in both cases the combined system had a significantly higher COP compared to the CO2 heat pump alone, with an average COP gain of 14.9% for direct DMS and 9.8% for indirect DMS.

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Pages: 12

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Details

  • Original title: Improvement of large CO2 heat pumps’ efficiency for district heating applications using dedicated mechanical subcooling.
  • Record ID : 30031437
  • Languages: English
  • Subject: Technology
  • Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
  • Publication date: 2023/08/21
  • DOI: http://dx.doi.org/10.18462/iir.icr.2023.0624

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