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Analysis of the gas compressibility effects on the constant-entropy reversible processes of refrigerants and refrigerant mixtures.

Author(s) : MONTE F. de

Type of article: Article, IJR article

Summary

Thermally and calorically real gas modelling based on the Martin-Hou equation of state is assumed for pure and mixed refrigerants in the superheated vapour phase. It allows the constant-entropy reversible processes which take place within the work transfer components of ideal vapour compression cycles to be properly analysed. These processes, in fact, occur in a region of the Mollier diagram close to the saturated vapour curve where covolume and molecular forces alter the equation of state of an ideal gas. Thus, real gas effects are significant and cannot be ignored. They give a more accurate indication of the refrigerant end temperature associated with an isentropic compression as well as of the corresponding work exchanged and volumetric efficiency. In particular, it is shown that the gas compressibility effects play a 'favourable' role during the isentropic compression processes since they allow the work transferred to be reduced up to 10% for HFC R134a and HFC mixtures R407C and R410A. But, at the same time, they play an 'unfavourable' role since they can reduce the compressor volumetric efficiency and, consequently, the cooling capacity of the vapour compression system up to 7%.

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Pages: 765-779

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Details

  • Original title: Analysis of the gas compressibility effects on the constant-entropy reversible processes of refrigerants and refrigerant mixtures.
  • Record ID : 2003-0040
  • Languages: English
  • Subject: HFCs alternatives
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 25 - n. 6
  • Publication date: 2002/09

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