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Performance prediction of a R744 transcritical cycle for air conditioning.

Number: pap. NS07

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

Summary

From the viewpoint of global environmental protection and energy-saving, the research and development on high-efficiency heat pump systems using environment-friendly refrigerants have become one of the most important issues in the air-conditioning and refrigeration sector. Carbon dioxide (R744) is regarded as a candidate for alternative refrigerant, and R744 heat pump water heater has already been commercialized. However, due to its low critical temperature and high operating pressure, there are still many problems that remain to be solved. One of the agenda is the prediction method for cycle performance when R744 is used as the working fluid of air conditioning equipment. In this study, a steady-state model of the R744 transcritical cycle for air conditioning has been developed to estimate the cooling and heating performance. This cycle consists of a rotary compressor, a fin-tube gas cooler, a fin-tube evaporator, an expansion valve and connecting tubes. The cycle performance has been examined by varying the specifications of heat exchangers and the degree of refrigerant superheat.

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Pages: 8 p.

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Details

  • Original title: Performance prediction of a R744 transcritical cycle for air conditioning.
  • Record ID : 30000460
  • Languages: English
  • Source: Measures to address climate change. 2010 International Symposium on Next-generation Air Conditioning and Refrigeration Technology: February 17-19, Tokyo, Japan.
  • Publication date: 2010/02/17

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