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Refrigeration cycle design by molecular simulation.

Author(s) : SMITH W. R., FRANCOVA M., KOWALSKI M., et al.

Summary

The authors describe a molecular simulation methodology to calculate the properties of a vapour-compression refrigeration cycle and its coefficient of performance, in the case when the refrigerant is a mixture. The methodology requires only a molecular force-field model for each refrigerant pure component and an expression for the vapour pressure of each pure component as a function of temperature. Both may be constructed by means of theoretical approaches in combination with minimal amounts of experimental data, and the latter may also be estimated by empirical formulae with reasonable accuracy. The approach involves a combination of several available molecular-level computer simulation techniques for the individual processes of the cycle. The authors describe the methodology in the case of refrigerant mixtures. This extends their earlier work in cases when the refrigerant is a pure fluid. The simulations entail the calculation of bubble- and dew-point curves for the refrigerant mixtures. The authors compare the results with those obtained from the Equation-of-State model used in the standard REFPROP software and with experimental data for the test case of R507a, a 50 mass % mixture of R125 (CHF2CF3) and R143a (CH3CF3).

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Pages: 2009-5

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Details

  • Original title: Refrigeration cycle design by molecular simulation.
  • Record ID : 2009-1992
  • Languages: English
  • Source: 3rd Conference on Thermophysical Properties and Transfer Processes of Refrigerants
  • Publication date: 2009/06/23

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