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Simulation of a CO2 transcritical cycle for air conditioning.

Author(s) : KOYAMA S., XUE J., KUWAHARA K., et al.

Summary

Due to its thermophysical properties, the CO2 transcritical cycle is greatly different from the conventional subcritical cycle. Consequently, the existing computational models developed for the conventional heat pump and refrigeration cycle are not appropriate to the performance evaluation for the CO2 based cycle, and a new prediction method is required. In the present study, a steady-state model of the CO2 transcritical cycle for air conditioning, which consists of a rotary compressor, a cross-counter flow gas cooler, a cross-parallel flow evaporator, an expansion device and connecting tubes, has been developed. Several kinds of flow and power losses have been considered in the compressor model. A detailed model of fin -tube heat exchanger has been constructed by means of the finite volume method, in which the local heat transfer and flow characteristics are evaluated according to the literature correlations. In the evaporator model, the effects of dew condensation generated on the cooling surface are considered. Then as a calculation example, the effects of the compressor discharge pressure and indoor air humidity on the cycle performance have been examined with this developed simulator.

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Pages: 2009-5

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Details

  • Original title: Simulation of a CO2 transcritical cycle for air conditioning.
  • Record ID : 2009-2116
  • Languages: English
  • Source: 3rd Conference on Thermophysical Properties and Transfer Processes of Refrigerants
  • Publication date: 2009/06/23

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