Specific heat capacities for HFC-mixtures.

[In German. / En allemand.]

Author(s) : GUNTHER D., STEIMLE F.

Type of article: Article


The specific heat capacity of some relevant HFCs as replacements for R12, R502 and R22 were measured in a temperature range of between -70 to 50 deg C at constant pressures of up to 3.2 megapascals. The investigated liquids are binary or ternary mixtures of R134a, R125a, R125, R32 and R143a. Empirical functional relations in polynomial form between the temperature, specific heat capacity and concentration were established. The coefficients of the polynomial correlations are presented. The predicted properties on the saturation line generally agree with the source data to about more or less 0,2%. The accuracy of the measurements is better than 1% for the pure fluids and 1,5% for the mixtures. Differences between 1% and a maximum of 2% can occur only at temperatures higher than 40 deg C and lower than -50 deg C.


  • Original title: [In German. / En allemand.]
  • Record ID : 1997-3215
  • Languages: German
  • Source: KI Luft Kältetech. - vol. 32 - n. 12
  • Publication date: 1996/12
  • Document available for consultation in the library of the IIR headquarters only.


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