SRW Peng-Robinson Equation of State (with Volume Translation): DETAILS

Name	TDE.SRW-Peng-Robinson. EOS
Name	TDE.Schwartzentruber-Renon-Watanasiri-Peng-Robinson. EOS
Comment	PR-EOS with Schwartzentruber-Renon-Watanasiri alpha function and constant-term volume translation
Variable VDN	Density
Variable T	Temperature
Variable P	Pressure
Intermediate V	Molar volume
Intermediate Z	Compressibility factor
Parameter TC	Critical temperature
Parameter PC	Critical pressure
Parameter AF	Acentric factor
Parameter φ	Array (1 to 3)
Parameter VT	Volume translation

Z = p×V/(R×T)

Z = V/(V - b) - {a×α(T)×V}/{(R×T)×(V² + 2×b×V - b²)}

a = (0.45724×(R×T_c)²)/p_c

b = (0.0778×R×T_c)/p_c

α(T) = [1 + (1 - T_r^1/2)×(m - Σφ_i×T_r^{i - 1})]², where the summation is over i = 1 to 3.

T_r = T/T_c Physical molar volume is obtained from the Peng-Robinson volume by adding V_T.