Thermal conductivity of the new refrigerants R134a,R152a,and R123 measured by the transient hot-wire method |
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Authors: | U Gross Y W Song E Hahne |
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Affiliation: | (1) Institut für Thermodynamik und Wärmetechnik, Universität Stuttgart, Pfaffenwaldring 6, 7000 Stuttgart 80, Germany |
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Abstract: | Thermal-conductivity measurements are reported for the new refrigerants R134a, R152a und R123. Transient hot-wire experiments were performed which cover both the liquid and vapor states at temperatures and pressures ranging from?=?20°C to 90°C and fromp=0.1 bar to 60 bar respectively. The results are correlated with density and temperature. In addition temperature dependent correlations are presented for (i) saturated liquid, (ii) saturated vapor, (iii) ideal gas (which equals approximately vapor state at ambient pressure). Finally the results are compared with data from the literature and also with the thermal conductivities of R12 and R11. |
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Keywords: | refrigerants R134a R152a R123 thermal conductivity transient hot-wire method |
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