Measurements of the vapor-liquid coexistence curve and the critical parameters for 1,1,1,2-tetrafluoroethane

Conference · Mon May 01 00:00:00 EDT 1989 · International Journal of Thermophysics; (USA)

OSTI ID:5523949

Kabata, Y; Tanikawa, S; Uematsu, M; Watanabe, K ^[1]

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1. Keio Univ., Yokohama (Japan)

Measurements of the vapor-liquid coexistence curve in the critical region for 1,1,1,2-tetrafluoroethane (R134a; CH{sub 2}FCF{sub 3}), which is currently considered as a prospective substitute for conventional refrigerant R12, have been performed by visual observation of the disappearance of the meniscus at the vapor-liquid interface within an optical cell. Twenty-seven saturated densities along the vapor-liquid coexistence curve between 208 and 999 kg {times} m{sup {minus}3} have been obtained in the temperature range 343 K to the critical temperature. The experimental uncertainties in temperature and density measurements have been estimated to be within {plus minus} 10 mK and {plus minus} 0.55%, respectively. On the basis of these measurements near the critical point, the critical temperature and the critical density for 1,1,1,2-tetrafluoroethane were determined in consideration of the meniscus disappearing level as well as the intensity of the critical opalescence. In addition, the critical exponent {beta} along the vapor-liquid coexistence curve has been determined in accord with the difference between the density of the saturated liquid and that of the saturated vapor.

• OSTI ID: 5523949
• Report Number(s): CONF-880606-; CODEN: IJTHD
• Journal Information: International Journal of Thermophysics; (USA), Vol. 10:3; Conference: 10. symposium on thermophysical properties, Gaithersburg, MD (USA), 20-23 Jun 1988; ISSN 0195-928X
• Country of Publication: United States
• Language: English

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37 INORGANIC
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54 ENVIRONMENTAL SCIENCES
FLUORINATED ALIPHATIC HYDROCARBONS
PHASE DIAGRAMS
REFRIGERANTS
MATERIALS TESTING
AIR POLLUTION ABATEMENT
COMPARATIVE EVALUATIONS
CRITICAL PRESSURE
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OZONE LAYER
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LAYERS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
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PHYSICAL PROPERTIES
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400201* - Chemical & Physicochemical Properties
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)