Thermophysical properties of gaseous refrigerants from speed-of-sound measurements. III. Results for 1,1-dichloro-2,2,2-trifluoroethane (CHCl sub 2 -CF sub 3 ) and 1,2-dichloro-1,2,2-trifluoroethane (CHClF-CClF sub 2 )

Journal Article · Tue Oct 01 00:00:00 EDT 1991 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.461831· OSTI ID:5235437

Goodwin, A R.H.; Moldover, M R ^[1]

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1. Thermophysics Division, National Institute of Standards and Technology, Gaithersburg, Maryland (USA)

The speed of sound in gaseous 1,1-dichloro-2,2,2-trifluoroethane (CHCl{sub 2}CF{sub 3}, commonly known as R123) has been measured at temperatures {ital T} between 260 and 335 K at pressures {ital p} from 1.6 to 77 kPa. Perfect-gas heat capacities and second and third acoustic virial coefficients have been calculated from the results. The second and third acoustic virial coefficients are used to estimate the density virial coefficients {ital B}({ital T} ) and {ital C}({ital T} ) and an effective square-well potential. The acoustic estimates of {ital B}({ital T} ) and {ital C}({ital T} ) are consistent with {ital B}({ital T} ) and {ital C}({ital T} ) deduced from high-quality ({ital p},{ital V}{sub {ital m}}, {ital T} ) results. The combined values of {ital B}({ital T} ) and {ital C}({ital T} ) cover a reduced temperature range of 0.57 to 0.99. We have also measured the speed of sound in 1,2-dichloro-1,2,2-trifluoroethane (CHClF-CClF{sub 2}, commonly known as R123a). This isomer of R123 is a significant impurity in R123 as manufactured and used. We provided estimates of the vibrational relaxation time for R123.

• OSTI ID: 5235437
• Journal Information: Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 95:7; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
CHLORINATED ALIPHATIC HYDROCARBONS
EQUATIONS
FLUIDS
FLUORINATED ALIPHATIC HYDROCARBONS
GASES
HALOGENATED ALIPHATIC HYDROCARBONS
LOW PRESSURE
LOW TEMPERATURE
MEDIUM TEMPERATURE
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHYSICAL PROPERTIES
REFRIGERANTS
RELAXATION TIME
SOUND WAVES
SPECIFIC HEAT
THERMODYNAMIC PROPERTIES
VELOCITY
VIRIAL EQUATION
WORKING FLUIDS