RESEARCH ARTICLE


New Correlations for Predicting the Thermodynamic Properties of Supercritical Carbon Dioxide



Liang-Biao Ouyang*
Chevron Corporation, P. O. Box 5095, Bellaire, TX 77402-5095, USA.


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© 2012 Ouyang et al.;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Correspondence: * Address correspondence to this author at the Chevron Corporation, P. O. Box 5095, Bellaire, TX 77402-5095, USA; Tel: 618 9485 5587; E-mail: louy@chevron.com


Abstract

Six new accurate and explicit correlations have been proposed in the present paper to predict the key thermodynamic properties of carbon dioxide under operational conditions anticipated for a typical carbon capture and sequestration (CCS) project – pressure = 1100 – 9000 psia (7 – 62 MPa) and temperature = 40 – 100 °C. These physical properties include entropy, enthalpy, internal energy, thermal conductivity, Joule-Thomson coefficient, and speed of sound, which all play an important role in controlling the PVT and thermodynamic behaviors of carbon dioxide associated with its flow through pipelines, wellbores, chokes, valves, and so on. The new correlations can predict carbon dioxide properties well matched to the high accuracy carbon dioxide property data available through the National Institute of Standards and Technology (NIST) web database [1].

Keywords: Carbon dioxide, thermodynamic properties, supercritical condition, carbon capture and sequestration, correlation.