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An experimental evaluation of the transcritical CO2 refrigerator performances using an internal heat exchanger.

Author(s) : APREA C., MAIORINO A.

Type of article: Article, IJR article

Summary

The classical substances as hydrochlorofluorocarbons (HCFCs) used as working fluids in the vapour compression plants have to be replaced by new substances because of their ozone depletion potential and their greenhouse effect. Carbon dioxide (CO2) is non-toxic, non-flammable, has zero ozone depletion potential and negligible global warming potential as refrigerant. Referring to a transcritical CO2 cycle working as a classical "split system" to cool air in residential applications, the aim of this paper is the evaluation of the energy performances using an internal heat exchanger. The experimental plant employs a semi-hermetic compressor, plate-finned tube type heat exchangers, a back pressure valve electronically controlled and an expansion valve. Besides it is possible to control the flash gas produced in the liquid receiver thanks to another semi-hermetic compressor linked to an inverter. An increase of the coefficient of performance has been found using the internal heat exchanger. The comparison of the coefficients of performance of two cycles, working with and without the internal heat exchanger, is discussed.

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Pages: 1006-1011

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Details

  • Original title: An experimental evaluation of the transcritical CO2 refrigerator performances using an internal heat exchanger.
  • Record ID : 2008-2419
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 31 - n. 6
  • Publication date: 2008/09

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