Modification of Peng-Robinson Equation of State for Supercritical Carbon Dioxide

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Sompop - Jarungthammachote


Use of carbon dioxide in supercritical process is increasingly interested, especially in power cycles and refrigeration systems. To find the thermodynamic properties for system design and analysis, the accurate equation of state is required. In the study, the parameter  in Peng-Robinson equation of state was modified for supercritical carbon dioxide. Two forms of new parameter  were proposed and the coefficients in the parameter were found based on the  data obtained from Span and Wagner equation of state. The predicted density from both modified equations was compared with original Peng-Robinson and Span and Wagner equations of state. Moreover, the density at pressure and temperature outside fitting range was also investigated the accuracy. The results showed that both forms of modified Peng-Robinson equation of state can provide fairly better predicted result than that from original Peng-Robinson equation of state.


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Jarungthammachote, S. .-. (2016). Modification of Peng-Robinson Equation of State for Supercritical Carbon Dioxide. Naresuan University Engineering Journal, 11(2), 59–66.
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