@article{(Open Science Index):https://publications.waset.org/pdf/9996719, title = {Tuning Cubic Equations of State for Supercritical Water Applications}, author = {Shyh-Ming Chern}, country = {}, institution = {}, abstract = {Cubic equations of state (EoS), popular due to their simple mathematical form, ease of use, semi-theoretical nature and reasonable accuracy, are normally fitted to vapor-liquid equilibrium P-v-T data. As a result, they often show poor accuracy in the region near and above the critical point. In this study, the performance of the renowned Peng-Robinson (PR) and Patel-Teja (PT) EoS’s around the critical area has been examined against the P-v-T data of water. Both of them display large deviations at critical point. For instance, PR-EoS exhibits discrepancies as high as 47% for the specific volume, 28% for the enthalpy departure and 43% for the entropy departure at critical point. It is shown that incorporating P-v-T data of the supercritical region into the retuning of a cubic EoS can improve its performance at and above the critical point dramatically. Adopting a retuned acentric factor of 0.5491 instead of its genuine value of 0.344 for water in PR-EoS and a new F of 0.8854 instead of its original value of 0.6898 for water in PT-EoS reduces the discrepancies to about one third or less. }, journal = {International Journal of Chemical and Molecular Engineering}, volume = {7}, number = {12}, year = {2013}, pages = {954 - 959}, ee = {https://publications.waset.org/pdf/9996719}, url = {https://publications.waset.org/vol/84}, bibsource = {https://publications.waset.org/}, issn = {eISSN: 1307-6892}, publisher = {World Academy of Science, Engineering and Technology}, index = {Open Science Index 84, 2013}, }