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Subatmospheric Vapor Pressures for Fluoromethane (R41), 1,1-Difluoroethane (R152a), and 1,1,1-Trifluoroethane (R143a) Evaluated from Internal-Energy Measurements

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Abstract

Vapor pressures were evaluated from measured internal-energy changes ΔU (2) in the vapor+liquid two-phase region. The method employed a thermodynamic relationship between the derivative quantity (∂U (2)/∂V) T , the vapor pressure p σ, and its temperature derivative (∂p/∂T)σ. This method was applied at temperatures between the triple point and the normal boiling point of three substances: fluoromethane (R41), 1,1-difluoroethane (R152a), and 1,1,1-trifluoroethane (R143a). In the case of R41, vapor pressures up to 1 MPa were calculated to validate the technique at higher pressures. For R152a, the calculated vapor pressure at the triple-point temperature differed from a direct experimental measurement by less than the claimed uncertainty (5 Pa) of the measurement. The calculated vapor pressures for R41 helped to resolve discrepancies in several published vapor pressure sources. Agreement with experimentally measured vapor pressures for R152a and for R143a near the normal boiling point (101.325 kPa) was within the experimental uncertainty of approximately 0.04 kPa (0.04%) for the published measurements.

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Authors and Affiliations

  1. Physical and Chemical Properties Division, Chemical Science and Technology Laboratory, National Institute of Standards and Technology, Boulder, Colorado, 80303, U.S.A

    H. A. Duarte-Garza & J. W. Magee

  2. Guest researcher from, Texas A&M University, Kingsville, Texas, 78363, U.S.A

    H. A. Duarte-Garza

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  1. H. A. Duarte-Garza
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  2. J. W. Magee
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Duarte-Garza, H.A., Magee, J.W. Subatmospheric Vapor Pressures for Fluoromethane (R41), 1,1-Difluoroethane (R152a), and 1,1,1-Trifluoroethane (R143a) Evaluated from Internal-Energy Measurements. International Journal of Thermophysics 20, 1467–1481 (1999). https://doi.org/10.1023/A:1021493106087

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  • DOI: https://doi.org/10.1023/A:1021493106087

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