Evaluation on Excess Entropy Scaling Method Predicting Thermal Transport Properties of Liquid HFC/HFO Refrigerants
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https://doi.org/10.1007/s11630-020-1383-2
Article ID: 1003-2169(2020)00-0000-00
Evaluation on Excess Entropy Scaling Method Predicting Thermal Transport Properties of Liquid HFC/HFO Refrigerants WANG Xuehui1, WRIGHT Edward1, GAO Neng2*, LI Ying3 1. Fluids and Thermal Engineering Research Group, Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK 2. Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China 3. Research Centre for Fluids and Thermal Engineering, University of Nottingham Ningbo China, Ningbo 315100, China © Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract: The application of the excess entropy scaling (EES) method to predict the viscosity, thermal conductivity and thermal diffusivity of HFC/HFO refrigerants is evaluated in this paper. The universal coefficients of the EES model were firstly obtained from the properties of HFC refrigerants, and the accuracy of the model was further investigated with HFO properties. It was suggested that the EES model correlated the viscosity very well with the average absolute deviations (AADs) of most HFC refrigerants lower than 6.55% except R32. The correlations also provided very good prediction on the viscosity for R1234yf and R1234ze(E), but not for R1336mzz(Z). The prediction of thermal conductivity for both HFC and HFO refrigerants was generally well with the maximum AAD of 11.44%. However, the paper also indicated that there were no universal thermal diffusivity coefficients for even HFC refrigerants, and the linear function could not fit the thermal diffusivity curve very well. Therefore, the exclusively two-order polynomial correlations based on the EES model were presented for each HFC/HFO refrigerant.
Keywords: excess entropy scaling, HFO, HFC, transport properties, refrigerants
1. Introduction In modern society, hydrofluorocarbons (HFCs) have been widely used in many industry fields, such as refrigeration, power generation, automobiles, and plastic foam blowing. However, they are generally considered transitional working fluids as they significantly contribute to global warming, as indicated by global warming potential (GWP). They will be surely substituted by environmental-friendly refrigerants [1–3].
Received: Apr 16, 2020
AE: LI Yinshi
Many governments and organizations have already introduced regulations to limit the utilization of HFCs. Recently, some haloalkanes (HFOs) have been proposed to address the environmental concerns and are believed to have very bright prospects in substituting the HFCs [4, 5]. The HFOs are unsaturated HFC, and because of their unsaturated characteristics, their lifespans are relatively shorter compared with traditional HFC refrigerants. As a result, the GWPs of the HFOs are very small. To evaluate the substitution potential of these HFO
Corresponding author: GAO Neng
E-mail: [email protected] www.springerlink.com
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J. Therm. Sci., Vol.29, No.*, 2020
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