Thermal conductivity of ethyl fluoride (HFC161)
Introduction
Ethyl fluoride (HFC161) as one of the hydrofluorocarbons (HFCs) has been chosen as an alternative refrigerant replacing chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) in Montreal Protocol and Kyoto Protocol. Its ODP (Ozone Depleting Potentials) is 0, and its GWP (Global Warming Potential) is 12. In addition, HFC161 has a high quality cooling capacity and a relatively high volumetric cooling capacity and energy efficiency. Therefore, much attention has been attracted to HFC161 recently in the field of refrigeration. In spite of its flammability, some expected improvements can be adopted for applying HFC161 in the refrigeration system. The cycle performance and some thermophysical properties of HFC161 have been reported [1], [2], [3], [4], [5], [6], [7], [8], but the thermal conductivity of HFC161, as one of the important thermophysical properties, has not been reported yet. In this work, the thermal conductivity of saturation liquid HFC161 over the temperature range from 233 K to 373 K and gaseous HFC161 from 233 K to 373 K at pressure up to 4470 kPa was measured.
Section snippets
Principle of experiment
The transient hot wire method is widely recognized as the most accurate method to measure the thermal conductivity of fluids. The fundamental working equation takes the form [9]:where q is the power input per unit length of the wire, λ is the thermal conductivity of the fluid, a is the thermal diffusivity of the fluid, t is the elapsed time, C = 1.781… is the exponential of the Euler's constant, r0 is the radius of the hot wire, ΔTid is the ideal temperature rise of
Thermal conductivity of toluene and nitrogen
The measurement system had been checked by measuring the thermal conductivity of the saturated liquid toluene (mass fraction purity better than 99.5%) from 318 K to 373 K and nitrogen (mass fraction purity better than 99.99%) from 318 K to 348 K before the apparatus was used to measure the thermal conductivity of HFC161. The measurement results of the saturated liquid toluene and nitrogen are shown in Table 2, Table 3, respectively. The reference data of the thermal conductivity of the saturated
Conclusion
The thermal conductivity of HFC161 was measured over the temperature range from 233 K to 373 K for saturated liquid and from 233 K to 373 K along 15 quasi-isotherms and at pressure up to 4470 kPa for the gaseous phase, respectively, by using the transient hot wire apparatus. The thermal conductivity of saturated liquid was correlated as a function of temperature with the mean deviation 0.53% and the maximum deviation −1.79%. The gaseous thermal conductivity was correlated as a function of
Acknowledgments
We acknowledge the support of the National Natural Science Foundation of China (Grant No. 51276143) and the Ministry of Environmental Protection of the People's Republic of China (2013467019).
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