Redo Illustration 7.5-3 with the Soave–RedlichKwong equation of state. Compare the results obtained with those for the Peng-Robinson equation in the illustration. Also, repeat the calculations for the Soave– Redlich-Kwong equation but with the simplifying assumption that the α function of Eqs. 6.7-6 and 6.7-8 is a constant and equal to unity, rather than a function of temperature.

Illustration 7.5-3

Vapor Pressure Calculations for Water with the Peng-Robinson Equation of State 

a. Compare the predictions for the vapor pressure of water from the Peng-Robinson equation of state with generalized coefficients with data in the saturated steam tables.

b. Use the PRSV equation of state with Eqs. 7.5-1 and 7.5-2 with κ₁ = −0.0665 to calculate the vapor pressure of water, and compare the results with data in the steam tables.

Transcribed Image Text:

a(T) = 0.42748 R²T2 Pe ca(T) (6.7-6)