Thermal Conductivity of Binary Refrigerant Mixtures of HFC-32/125 and HFC-32/134a in the Liquid Phase |
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Authors: | X Gao Y Nagasaka A Nagashima |
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Affiliation: | (1) Department of System Design Engineering, Keio University, 3-14-1 Hiyoshi, Yokohama, 223-8522, Japan |
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Abstract: | The liquid thermal conductivity of mixtures of HFC-32/125 and HFC-32/134a was measured using the transient hot-wire apparatus in the temperature ranges from 213 to 293 K and from 193 to 313 K, respectively, in the pressure range from 2 to 30 MPa and with HFC-32 mass fractions of 0.249, 0.500, and 0.750 for each system. The uncertainty of the thermal conductivity was estimated to be ±0.7%. For practical applications, the thermal conductivity data for the two mixtures were represented by a polynomial in temperature, pressure, and mass fraction of HFC-32 with a standard deviation of 1.0%. |
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Keywords: | HFC-32/125 HFC-32/134a binary mixture refrigerant thermal conductivity transient hot-wire method |
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