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Thermophysical properties of alternative refrigerants.

Author(s) : GUROVA A. N., BARAO M. T., SOUSA A. T., NIETO DE CASTRO C. A., MARDOLCAR U. V., FIALHO P. S.

Summary

The dielectric constant and the thermal conductivity of three provisional replacements, R123, R141b, R142b and two class A fluids, R134a and R152a, have been measured in the temperature range 200 to 300 K and pressures up to 20 megapascals, using a direct capacitance method. The density of R142b, R22 + R142b and R141b was measured with a vibrating fork densimeter. The instruments are capable of obtaining the dielectric constant with an absolute uncertainity of 0.1%, the thermal conductivity with 0.5% and the density with 0.1%. The density dependence of the dielectric constant has been studied. The dipole moments of the several refrigerants in the liquid phase were obtained.

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Pages: 393-401

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Details

  • Original title: Thermophysical properties of alternative refrigerants.
  • Record ID : 1995-1461
  • Languages: English
  • Source: CFCs, the Day After.
  • Publication date: 1994/09/21
  • Document available for consultation in the library of the IIR headquarters only.

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