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Performance simulations of two-stage screw heat pump with economizer.

Author(s) : BAIK Y. J., LEE Y. S., RA H. S., et al.

Summary

In order to predict and optimize the performance of R-134a screw heat pump in various configurations and operating conditions, steady-state simulations were carried out in the study. The simulation model contains a high-stage compressor, a non-economized low-stage compressor, an economized low-stage compressor, expansion valves and heat exchangers. A high-stage compression was considered as a polytrophic process, while a condenser, an evaporator, an intermediate heat exchanger and an economizer were modelled by UA-LMTD method with a counter-flow assumption. An economized compressor was considered as it could be divided into 3 processes: the first-stage polytrophic internal compression process, the additional charge process with adiabatic and constant-volume assumption, and the second-stage polytrophic one. The simulation results show that the performance enhancement by two-staging becomes stronger as a heat sink outlet temperature goes higher.

Details

  • Original title: Performance simulations of two-stage screw heat pump with economizer.
  • Record ID : 2007-0857
  • 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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