Article history: An equation of state with near-critical corrections is developed for water (H O) and carbon diox- Received 10 September 2015 ide (CO ). The equation is constrained by the critical conditions and optimized with highly accurate Received in revised form 17 February 2016 pressure–volume–temperature (PVT) and phase equilibrium data at temperatures from the triple point Accepted 20 February 2016 to 647.096 K and pressures from zero to 80 MPa. The resulting equation is systematically checked in the Available online 5 March 2016 above P–T range. For H O, the vapor pressures are reproduced within 0.032%, with an average deviation of only 0.005%; the average deviations of the saturated vapor and liquid volumes, and the volumes in the Keywords: single-phase regions are 0.047%, 0.019% and 0.058%, respectively. The maximum deviations of the above- Equation of state mentioned volumes are 1.26%, 0.91% and 1.06%, respectively, which are all in the immediate vicinity of Water the critical point. Below 520 K, the deviations of PVT and saturation properties are all within 0.06%. For Carbon dioxide subcritical CO , the average and maximum deviations of vapor pressures are 0.011%, 0.077%, respectively; Phase equilibrium 2 PVT properties the average deviations of the
International Journal of Greenhouse Gas Control – Elsevier
Published: Jun 1, 2016
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