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Methodology for estimating thermodynamic parameters and performance of alternative refrigerants.

Author(s) : BROWN J. S.

Summary

This paper demonstrates, through several examples of potential R114 replacement refrigerants, the step-by-step procedure to implement the methodology described in, for example, Reid et al. (1987) and Poling et al. (2001), and illustrated in recent publications by Brown, for evaluating the thermodynamic performance potentials of alternative refrigerants. This methodology allows one to estimate quickly and easily several key thermodynamic parameters, namely, critical temperature, critical pressure, critical density, ideal gas specific heat at constant pressure, and acentric factor, from knowing only a refrigerant's normal boiling point temperature and its molecular structure. Once these key parameters are known, the Peng-Robinson equation-of-state formulation implemented in REFPROP 8.0 (Lemmon et al. 2007) easily can be used to predict a refrigerant's heating or cooling coefficient of performance and volumetric heating or cooling capacity. The power of this methodology is that one can predict easily and quickly the performance potentials of a large number of refrigerants that are not-so-well-described, as well as ones that are, limiting the need for expensive and time-consuming experimentation or detailed equation-of-state modelling. Then, once this preliminary investigation is complete, one could focus on a shortened, much more limited list of potential replacement refrigerants.

Details

  • Original title: Methodology for estimating thermodynamic parameters and performance of alternative refrigerants.
  • Record ID : 2009-1026
  • Languages: English
  • Source: ASHRAE Transactions. 2008 Winter Meeting, New York City, NY. Volume 114, part 1 + CD-ROM.
  • Publication date: 2008/01/19

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