Thermal conductivities of new refrigerants R125 and R32 measured by the transient hot-wire method
- Freiberg Univ. of Mining and Technology (Germany)
Thermal conductivity measurements are reported for the new refrigerants pentafluoroethane (R125) and difluoromethane (R32), which are suggested to replace chlorodifluoroethane (R22) as components of a mixture. Transient hot-wire experiments were performed which cover both the liquid and the vapor states at temperatures and pressures ranging from t=-40 to 90{degrees}C and from p=1 to 60 bar. Uncertainties keep within 1.6% for liquid and 2.0% for vapor states. The results are correlated with density and temperature. In addition, temperature-dependent correlations re presented for practical calculations for (i) saturated liquid, (ii) saturated vapor, and (iii) dilute gas (which approximately equals the vapor state at ambient pressure). Finally, the results are compared with data from the literature and also with the respective thermal conductivities of R22.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 471826
- Journal Information:
- International Journal of Thermophysics, Journal Name: International Journal of Thermophysics Journal Issue: 3 Vol. 17; ISSN 0195-928X; ISSN IJTHDY
- Country of Publication:
- United States
- Language:
- English
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