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Performance evaluation of CO2-based mixture refrigerants in ground-source heat pump with ejector.

Number: pap. n. 1125

Author(s) : WU W., LEUNG M., LI X.

Summary

Ground-source heat pumps (GSHPs) attract increasing interest but requires alternative refrigerants with low GWPs. This work investigates the performance of CO2-based mixture refrigerants in GSHPs with ejector. R41, R32, R161 and R1270 are selected from different HFCs/HFOs/HCs to be blended with CO2. These mixtures are compared for GSHPs with and without ejector under various compositions. Results indicate that the cooling capacity of each mixture increases with the CO2 fraction; ejector increases the cooling capacities for CO2/R41 but decreases those for CO2/R32, CO2/R161 and CO2/R1270. Ejector increases the COP of pure refrigerants and mixtures with small temperature glides, but not with large temperature glides. Without ejector, mixtures always outperform CO2 and outperform pure HFC/HFO/HC under lower CO2 fractions. With ejector, mixtures outperform CO2 under lower CO2 fractions but never outperform pure HFC/HFO/HC. In addition, the discharge temperature with ejector is much higher for mixtures with large temperature glides.

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Details

  • Original title: Performance evaluation of CO2-based mixture refrigerants in ground-source heat pump with ejector.
  • Record ID : 30026514
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.1125

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