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An experimental study of CO2 thermodynamic cycles.

Author(s) : MONTAGNER G., MELO C.

Summary

This work focuses on the study of CO2 thermodynamic cycles in an attempt to identify the best cycle option for a certain application and operation conditions. To this end, a testing apparatus was designed and built. With such an apparatus the operation conditions, the component characteristics and also the cycle configuration can be easily altered, thereby allowing the experimental evaluation of their effect on the system energy efficiency. Experiments were carried out with a standard cycle, using a capillary tube as an expansion device. It was shown that for each capillary tube there is a specific refrigerant charge that maximizes the system coefficient of performance. It was also shown that capillary tube-based CO2 systems are susceptible to variations in the operation conditions. Experiments were also carried out with a modified cycle, where a needle valve works in series with a capillary tube. It was shown that the evaporation pressure can be effectively controlled by regulating the refrigerant flow through the expansion device. Additionally, it was demonstrated that the discharge pressure can be properly controlled by adjusting the refrigerant charge in the high side pressure of the system. Further studies are underway and the results will be reported in due course.

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Pages: 2010-2

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Details

  • Original title: An experimental study of CO2 thermodynamic cycles.
  • Record ID : 2010-0709
  • Languages: English
  • Source: 9th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2010). Proceedings. Sydney, Australia, April 12-14, 2010.
  • Publication date: 2010/04/12

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