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

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Published: Dec 29, 2016
DOI: https://doi.org/10.14456/nuej.2016.28
Keywords:
Alpha function Peng-Robinson Equation of State Supercritical CO2

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Sompop - Jarungthammachote
Kasetsart University SriRacha Campus 199 Sukhumvit Road, SriRacha, Chonburi, 20230

Abstract

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.

Article Details

How to Cite
Jarungthammachote, S. .-. (2016). Modification of Peng-Robinson Equation of State for Supercritical Carbon Dioxide. Naresuan University Engineering Journal, 11(2), 59–66. https://doi.org/10.14456/nuej.2016.28
Issue
Vol. 11 No. 2 (2016): JULY - DECEMBER
Section
Research Paper

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