超临界区制冷剂热力性质快速计算方法

n implicit model together with a novel implicit-regress and explicit-calculation fast calculation method for supercritical refrigerant thermodynamic properties was presented. The novel method can guarantee the calculation reversibility, high calculation speed and calculation stability of the supercritical refrigerant thermodynamic properties. The source data was calculated from REFPROP7. With the implicit-regress and explicit-calculation fast calculation method, calculation formulae for thermodynamic properties of supercritical CO2, covering the temperature of 304.13K～393.15 K and the pressure of 7.3773MPa～12.0MPa, were presented. The comparison result shows that the calculation speed of the fast calculation formulae was two orders faster than that of REFPROP 7 and the mean relative deviation of the fast calculation formulae is within 1.8 %.