Abstract
A new fundamental low-parametric equation of state in the form of a reduced Helmholtz function is developed for carbon dioxide to describe the thermodynamic properties of normal substances. The equation of state makes it possible to describe the thermal and caloric properties of a gas, liquid, or supercritical fluid in the range of pressures up to 200 MPa with high accuracy that is close to experimental (except in the critical region). Carbon dioxide’s caloric properties and speed of sound in it are calculated without using any caloric data, except for the ideal gas enthalpy. The calculated values of the isochoric heat capacity, speed of sound, and other thermodynamic properties are in good agreement with experimental data (reliable reference tables).
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Funding
This work was performed as part of a State Task, project no. III.18.2.2. It was supported by the Russian Foundation for Basic Research, project no. 15-08-01072а.
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Translated by O. Polyakov
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Kaplun, A.B., Meshalkin, A.B. Calculating the Thermodynamic Properties of Carbon Dioxide in the Range of Pressures up to 200 MPa. Russ. J. Phys. Chem. 93, 1641–1648 (2019). https://doi.org/10.1134/S0036024419090073
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DOI: https://doi.org/10.1134/S0036024419090073