Thermal conductivity of a wide range of alternative refrigerants measured with an improved guarded hot-plate apparatus

Journal Article · Fri Sep 01 04:00:00 EDT 1995 · International Journal of Thermophysics

DOI:https://doi.org/10.1007/BF02081288· OSTI ID:123376

Hammerschmidt, U ^[1]

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1. Physikalisch-Technische Bundesanstalt, Braunschweig (Germany)

The thermal conductivity of the refrigerants R22, R123, R134a, R142b, R143a, and R152a has been determined as a function of temperature in the range from 300 to 460 K. Measurements were carried out at atmospheric pressure with an improved guarded hot-plate apparatus. The width of the instrument`s gas layer and the temperature difference across the metering section were varied to detect any stray heat transfer. Radiation correction factors were derived from IR absorption spectra. The uncertainty of the measurements is estimated to be 2% at a standard deviation of less than 0.1%. Our data sets are compared with corresponding hot wire results. In contrast to the generally preferred hot wire technique, with its possible electrical and chemical interactions between the wire and the polar refrigerant, there are no such difficulties using a guarded hot-plate apparatus. Our data sets may thus contribute to the discussions on discrepancies in thermal conductivity values from various authors using hot wire as one particular method.

• Sponsoring Organization: USDOE
• OSTI ID: 123376
• Report Number(s): CONF-940633--
• Journal Information: International Journal of Thermophysics, Journal Name: International Journal of Thermophysics Journal Issue: 5 Vol. 16; ISSN IJTHDY; ISSN 0195-928X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
66 PHYSICS
EXPERIMENTAL DATA
HALOGENATED ALIPHATIC HYDROCARBONS
MEASURING METHODS
REFRIGERANTS
TEMPERATURE DEPENDENCE
THERMAL CONDUCTIVITY