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The paper presents the thermal conductivity of mixtures of liquid refrigerants. The group of systems studied consists of two binary mixtures of R22/RI42b and R22/RI52a. The measurements have been carried out in the temperature range 160-300 K for pressures from 0.2 to 8.0 MPa in a transient coaxial-cylinder instrument. The uncertainty of the thermal conductivity data is estimated to be +2%. The experimental method and apparatus were validated by using the measurements of refrigerant R22. The results presented have been used to develop a correlation for the description of the thermal conductivity of refrigerants.

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