Authors

Thermal conductivity of mixtures of the rarefied gaseous hydrofluorocarbons

UDC 536.2

Thermal conductivity of mixtures of the rarefied gaseous hydrofluorocarbons

Tsvetkov O. B., Laptev Yu.A.

Abstract
New thermal conductivities measurements for the gaseous state of the binary mixtures of the hydrofluorocarbons HFC-32+ HFC-134a of different compositions are presented. The measurements were carried out at temperatures from 292.36 to 365.05 K in pressure range from 0.12 to 0.34 MPa. Thermal conductivity was measured with the vertical coaxial cylindrical stationary method. The estimated accuracy of the measured results is ±2.5 %. The thermal conductivity of binary gaseous mixtures at law pressure was estimated by Wassiljewa relation modified by Lindsey and Bromley with a mean deviation up to 1%. A new correlation which represent our experimental thermal conductivity data and those of the triple gaseous mixture HFC-32+HFC-134a+HFC-125 with satisfactory agreement is introduced.

Keywords: rarefied gaseous mixtures, HFC-32, HFC-134a, refrigerants, R407С, thermal conductivity

All references

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