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MH-81方程是汽液相平衡计算的通用状态方程之一。现用于制冷剂的二元混合物。 一、纯质容积性质和相平衡的推算 MH-81型状态方程形式见文献[1]。原则上,确定该方程的常数只需要临界点的P_c、V_c、T_c和一个饱和点的P~s、T~s。但用于汽液相平衡计算的MH-81常数需要优化。 对12种制冷剂计算所得容积性质V~v、V~l和逸度f_i~l、f_i~v按下式检验计算精度。
The MH-81 equation is one of the general state equations for vapor-liquid phase equilibrium calculations. Binary mixture for refrigerant. First, the nature of the volume and balance of the nature of the MH-81-type equations of state equations see the literature [1]. In principle, it is only necessary to determine P_c, V_c, T_c of the critical point and P ~ s, T ~ s of a saturation point for determining the constants of the equation. However, the MH-81 constant used for the vapor-liquid equilibrium calculation needs to be optimized. Calculate the volumetric properties V ~ v, V ~ l and fugacity f_i ~ l, f_i ~ v of 12 kinds of refrigerants according to the following formula to check the calculation accuracy.