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Predicting performance of refrigerants using the Peng-Robinson equation of state.

Author(s) : BROWN J. S.

Type of article: Article, IJR article

Summary

In this paper, the author presents a process to use the Peng-Robinson equation of state as implemented in REFPROP 8.0 to easily and quickly evaluate the performance potentials of a large number of refrigerants in an idealized vapour compression refrigeration cycle. By knowing only a refrigerant's normal boiling point temperature and its molecular structure, one can use the Peng-Robinson equation of state to predict the absolute mean percentage errors for the COP and the volumetric cooling capacity for the group of refrigerants given by Saleh and Wendland (see the Bulletin of the IIR, reference 2006-1089) to within approximately 2.0 and 10.6%, respectively, of both BACKONE and the default, high-accuracy equations in REFPROP. If, in addition to the normal boiling point temperature, one were to use known values for the critical temperature, critical pressure, and critical density, the mean percentage errors for the COP and the volumetric cooling capacity are then within approximately 1.8 and 3.7%, respectively, of both BACKONE and REFPROP. Finally, when including a known value for the ideal gas specific heat at constant pressure, the mean percentage errors for the COP and the volumetric cooling capacity are within approximately 1.5 and 2.7%, respectively, of both BACKONE and REFPROP. Therefore, the three approaches presented in this paper can be effective tools to evaluate the performance potentials of a large number of refrigerants, including newer ones where only a limited amount of experimental data may be available.

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Pages: 1319-1328

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Details

  • Original title: Predicting performance of refrigerants using the Peng-Robinson equation of state.
  • Record ID : 2008-0052
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 30 - n. 8
  • Publication date: 2007/12

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