Alternative refrigerants R123a, R134, R141b, R142b, and R152a: Critical temperature, refractive index, surface tension, and estimates of liquid, vapor, and critical densities

Journal Article · Thu Dec 13 04:00:00 EST 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100388a018· OSTI ID:6104743

Chae, Hee Baik; Schmidt, J W; Moldover, M R ^[1]

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1. National Institute of Standards and Technology, Gaithersburg, MD (USA)

Differential capillary rise and refractive index data are reported for five alternative refrigerants: R123a (CHClF-CClF{sub 2}), R134 (CHF{sub 2}-CHF{sub 2}), R141b (CCl{sub 2}F-CH{sub 3}), R142b (CClF{sub 2}-CH{sub 3}), and R152a (CHF{sub 2}-CH{sub 3}). The data extend from about 25{degree}C to the critical point of each fluid and directly yield the critical temperature {Tc} and the temperature-dependent capillary length. The present data were combined with liquid density data (near ambient temperature) to determine the Lorentz-Lorenz constant. The Lorentz-Lorenz relation is used to estimate the liquid, vapor, and critical densities, and the surface tension. The surface tension {sigma} of seven substituted ethane refrigerants (the present five and R123 (CHCl{sub 2}-CF{sub 3}) and R134a (CF{sub 3}-CH{sub 2}F)) is within {plus minus}10% of the expression: {sigma} = 64 mN/m{center dot}t{sup 1.26}, where t = ({Tc} {minus} T)/{Tc} is the reduced temperature measured from the critical temperature. The surface tension of the same seven refrigerants is within {plus minus}5% of the expression {sigma} = 5.7t{sup 1.26}k{sub B}{Tc}(N{sub A}/V{sub c}){sup 2/3}, where k{sub B}, N{sub A}, and V{sub c} are the Boltzmann constant, the Avogadro constant, and the molar critical volume, respectively.

• OSTI ID: 6104743
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:25; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

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CALCULATION METHODS
CRITICAL TEMPERATURE
DATA
EXPERIMENTAL DATA
FLUIDS
FREONS
HALOGENATED ALIPHATIC HYDROCARBONS
INFORMATION
MEASURING METHODS
NUMERICAL DATA
OPTICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHYSICAL PROPERTIES
REFRACTIVITY
REFRIGERANTS
SURFACE PROPERTIES
SURFACE TENSION
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
WORKING FLUIDS