New Fundamental Equations of State with a Common Functional Form for 2,3,3,3-Tetrafluoropropene (R-1234yf) and <Emphasis Type="Italic">trans</Emphasis>-1,3,3,3-Tetrafluoropropene (R-1234ze(E)) |
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Authors: | Ryo Akasaka |
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Affiliation: | (1) Oil and Gas Center of Excellence, Department of Chemical Engineering, University of Tehran, Enghlab Ave., Tehran, 1944874, Islamic Republic of Iran; |
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Abstract: | New fundamental equations of state explicit in the Helmholtz energy with a common functional form are presented for 2,3,3,3-tetrafluoropropene
(R-1234yf) and trans-1,3,3,3-tetrafluoropropene (R-1234ze(E)). The independent variables of the equations of state are the
temperature and density. The equations of state are based on reliable experimental data for the vapor pressure, density, heat
capacities, and speed of sound. The equation for R-1234yf covers temperatures between 240 K and 400 K for pressures up to
40 MPa with uncertainties of 0.1 % in liquid density, 0.3 % in vapor density, 2 % in liquid heat capacities, 0.05 % in the
vapor-phase speed of sound, and 0.1 % in vapor pressure. The equation for R-1234ze(E) is valid for temperatures from 240 K
to 420 K and for pressures up to 15 MPa with uncertainties of 0.1 % in liquid density, 0.2 % in vapor density, 3 % in liquid
heat capacities, 0.05 % in the vapor-phase speed of sound, and 0.1 % in vapor pressure. Both equations exhibit reasonable
behavior in extrapolated regions outside the range of the experimental data. |
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