Thermodynamic Properties of Freon- in

In reference books [0.7, 0.45, and others] the tables of thermodynamic properties of Freon-21 which were compiled by Benning and McHamess (1939) are recommended. 

Rombusch and Giesen [0.46] compiled a new system of equations including an equation of state (0.6) and the interpolated formulas (0.10), (0.13), and (0.19). They calculated the tables for the values of p, A, and s on the saturation line for T = 213-451 K, and the K IgP diagram in the region T = 203-473 K at pressures up to 10 MPa [2.37]. Tabular data [2.37] are presented in some reference books [0.8-0.10 and others]. In Ref. [0.11], with the help of the same system of equations, detailed tabular values are calculated for v, h, and s for superheated vapor in the interval T = 243-473 K and p = 0.01-5 MPa. It should be pointed out that a large part of the tables under consideration cannot be looked at as experimentally substantiated. 

Altunin et al. [2.1] suggested a thermal equation of state of type (0.7), which was obtained on the basis of computer analysis of experimental pvT data for liquid and gaseous Freon-21 in the interval T = 298-473 K and p = 0.3-19 MPa. The calculated tabular values of p, K and s from this equation are partially reproduced in paper [2.1] and in Refs. [0.10, 0.34]. 

Sheludyakov and A. A. Shilyakov [2.18, 2.21], on the basis of graphical and analytical analyses of experimental data [2.19, 2.25], obtained the following equation of state for the superheated vapor of Freon-21 

It should be pointed out that in Refs. [2.17, 2.18, 2.21] the thermodynamic properties of saturated vapor of Freon-21 were calculated using the empirical vapor pressure curve equation 

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