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CO2 properties.

Author(s) : RIEBERER R.

Summary

The thermodynamic properties of CO2 are "new" for heat pumps because CO2 differs considerably from common refrigerants. In heat pumps, the critical data of CO2 (31 °C, 74 bars) result in near-critical conditions, i.e. high pressures, densities, and heat transfer coefficients. Investigations have shown that the heat transfer and pressure drop in single-phase flow can be estimated with "standard" calculation models. In contrast to heat transfer at evaporation which still shows problems, the heat transfer of pure CO2 can be estimated precisely, but in the case of oil contamination, heat transfer drops significantly and the models overestimate the "reality".

Details

  • Original title: CO2 properties.
  • Record ID : 2000-1725
  • Languages: English
  • Source: CO2 technology in refrigeration, heat pump & air conditioning systems (with presentation of the results of the European JOULE/THERMIE Research Programme on CO2 heat pumping systems - COHEPS). Workshop proceedings.
  • Publication date: 1999/03/18
  • Document available for consultation in the library of the IIR headquarters only.

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