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| Calculations of refrigerant thermal properties are desired to be very fast and stable in cases of simulation of refrigeration system, etc. The implicit regress and explicit calculation method is a quite good method for the fast and stable calculation of refrigerant thermodynamic properties, and it has been used for saturated, two-phase and superheated refrigerants. In this paper, the implicit regress and explicit calculation method is extended to the calculation of subcooled refrigerants. As an example, the fast calculation formulae for subcooled refrigerant R22, R134a, R410A and R407C are developed based on the source data derived from NIST REFPROP 7.1. The comparison shows that, for pure refrigerant, the total mean relative deviations of the fast calculation formulae are less than 0.02 % and the maximum relative deviations are less than 0.60%; for refrigerant mixtures, the total mean relative deviations of the fast calculation formulae are less than 0.08%. The maximum relative deviation of R410A is less than 3.36% while the maximum relative deviation of R407C is less than 0.87%. The mean calculation speed of the fast calculation formulae for thermal properties of pure refrigerant and that of refrigerant mixtures are near 100 times and more than 1500 times faster than those of NIST REFPROP 7.1, respectively. |
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| Keywords:Fast calculation; Implicit curve-fitting; Refrigerant thermodynamic properties; Subcooled僴 |
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