Fast Calculation Method for Subcooled Pure Refrigerant Thermodynamic Propertie

With the implicit regress and explicit calculation fast calculation method,explicit fast calculation formulae for thermal properties of four types of pure refrigerants,such as R22,R134a,R125 and R32,covering the saturated temperature of-60～80℃ for R22 and R134a,saturated temperature of-60～60℃for R125,saturated temperature of-60～70℃ and subcooling of 0～20℃ for R22,R134a,R125 and R32,are presented.So the implicit-regress and explicit-calculation fast calculation method for subcooled pure refrigerant thermal properties is presented.This method can guarantee the calculation reversibility,calculation stability and high calculation speed of the refrigerant thermodynamic properties.The calculation speed and the accuracy of the fast calculation formulae are validated by the comparison with REFPROP 6.01.The comparison result shows that calculation speed of the fast calculation formulae is two orders faster than those of REFPROP 6.01.And the maximum relative deviation of all the fast calculation formulae is less than 0.796% and the mean relative deviation is less than 0.0706%.