Thermal conductivity andPVT measurements of pentafluoroethane (refrigerant HFC-125) |
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| Authors: | O B Tsvetkov A V Kletski Yu A Laptev A J Asambaev I A Zausaev |
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| Affiliation: | (1) Technological Institute of Refrigeration, 9 Lomonossov Street, 191002 St. Petersburg, Russia;(2) Institute of Food Technology, Semipalatinsk, Kazakhstan;(3) Institute of Food Technology, Kemerovo, Russia |
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| Abstract: | By means of the transient and steady-state coaxial cylinder methods, the thermal conductivity of pentafluoroethane was investigated at temperatures from 187 to 419 K and pressures from atmospheric to 6.0 MPa. The estimated uncertainty of the measured results is ±(2–3)%. The operation of the experimental apparatus was validated by measuring the thermal conductivity of R22 and R12. Determinations of the vapor pressure andPVT properties were carried out by a constant-volume apparatus for the temperature range 263 to 443 K, pressures up to 6 MPa, and densities from 36 to 516 kg m–3. The uncertainties in temperature, pressure, and density are less than ±10 mK, ±0.08%, and ±0.1%, respectively.Paper presented at the Twelfth Symposium on Thermophysical Properties, June 19–24, 1994, Boulder, Colorado, U.S.A. |
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| Keywords: | coaxial cylinders constant-volume apparatus pentafluoroethane PVT properties R125 refrigerant thermal conductivity vapor pressure |
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