Find the constants in the curve fit for the saturation pressure using Wagner’s correlation, as shown in the previous problem for water and methane. Find other correlations in the literature, compare them to the tables, and give the maximum deviation.

Data from previous problem 

Saturated pressure as a function of temperature follows the correlation developed by Wagner as

where the reduced pressure and temperature are P_r = P/P_c and T_r = T/T_c. The temperature variable is τ = 1 − T_r. The parameters are found for R-134a as

Transcribed Image Text:

In P, = [Wit + w2t1s+w3r + w4t°]/T, 1.5