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Preliminary design study of a R-717/R-134a cascade heat pump using sea water as a heat source.

Author(s) : BAIK Y. J., CHANG K. C., PARK S. R., et al.

Summary

A preliminary design study was conducted to evaluate a R-717/R-134a cascade heat pump using sea water as a heat source. The system was designed to perform a single stage operation in summer, as well as a cascade operation in winter to ensure the high temperature lift. A steady-state simulation model was developed to analyze and optimize its performance. The model contains compressors, expansion valves and heat exchangers. The compressors were analyzed by map-based model, while a condenser, an evaporator and a cascade heat exchanger were modelled by UA-LMTD method with counterflow assumptions of refrigerants. HFCs other than R-134a were also examined as a working fluid. The simulation results show that the R-717/R-134a cascade heat pump exhibits best performance among combinations considered in the study. The proposed R-717/R-134a cascade system is expected to bring a COP of 5.5 in summer along with a heating COP of 3.5 in winter

Details

  • Original title: Preliminary design study of a R-717/R-134a cascade heat pump using sea water as a heat source.
  • Record ID : 2007-0855
  • Languages: English
  • Source: ACRA-2006. Proceedings of the 3rd Asian conference on refrigeration and air conditioning.
  • Publication date: 2006/05/21

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