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Investigation on the optimal heat rejection pressure of CO2 transcritical expander cycle.

Author(s) : YANG J., MA Y., LI M., et al.

Summary

There is an optimal heat rejection pressure existing in the CO2 transcritical refrigeration cycle which gives a maximum COP. Whereas, the optimal heat rejection pressure in the expander cycle is different from that of in the throttle valve cycle. The optimal heat rejection pressure in the CO2 expander cycle mainly depends on the compressor efficiency, expander efficiency, the outlet temperature of the gas cooler and the evaporation temperature, etc. When the compressor and the expander efficiencies are given, the optimal heat rejection pressure in the CO2 throttle valve cycle is greater than that of in the expander cycle. In order to calculate conveniently, the values of the optimal heat rejection pressure in the expander cycle are regressed, and a calculation correlation is obtained.

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Pages: ICR07-B1-254

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Details

  • Original title: Investigation on the optimal heat rejection pressure of CO2 transcritical expander cycle.
  • Record ID : 2008-0048
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/07/21

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