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Thermophysics and Aeromechanics

2009 year, number 2

Thermal conductivity and thermal diffusivity of the R134a refrigerant in the liquid state

A.V. Baginsky1, A.S. Shipitsyna2
1 Kutateladze Institute of Thermophysics SB RAS, gamma@itp.nsc.ru
2 Kutateladze Institute of Thermophysics SB RAS
Keywords: thermal conductivity, thermal diffusivity, R134a, liquid state, method of high-frequency thermal waves
Pages: 267-273

Abstract

Thermal conductivity and thermal diffusivity of "ozone-safe" refrigerant R134а in liquid state within the range of temperatures 295.9−354.9 K and pressures from the liquid ⎯ vapor equilibrium line up to 4.08 MPa have been studied by high-frequency thermal-wave method. The experimental uncertainties of temperature, pressure, thermal conductivity and thermal diffusivity measurement errors were estimated to be 0.1 K, 3 kPa, 1.5 and 2.5 %, respectively. Values of thermal conductivity and thermal diffusivity of liquid R134а on saturated line have been calculated. Approximation dependences for thermal conductivity and thermal diffusivity within the whole studied range of temperatures and pressures as well as on the saturated line have been obtained.