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Numerical Investigations on Supercritical Heat Transfer Characteristics of environmental friendly refrigerants

International Journal of Clean Coal and Energy 2021年第2期10卷 21-40页

作者： Adnan Ibrahim Peng Hu Yiran Jiang Ali Riaz Farrukh Saleem Yifang Dong Lei Jia Panpan Zhao Department of Thermal Science and Energy Engineering University of Science and Technology of China Hefei China Department of Mechanical Engineering Pakistan Institute of Engineering and Applied Sciences Islamabad Pakistan School of Engineering Science University of Science and Technology of China Hefei China Hefei General Machinery Research Institute Co. Ltd. Hefei China

The heat transfer of supercritical fluids is a vastly growing field, specifically to find suitable alternatives to replace conventional R134a, which can be beneficial for climate change. Most of the experimental and numerical investigations have been conducted to explore supercritical water, carbon dioxide and R134a as heat transfer working fluids. Hydrofluoroolefin (HFO) and refrigerants blends have been considered the most environment-friendly refrigerants to replace Chlorofluorocarbons (CFCs), Hydrochlorofluoro-carbons (HCFCs) and Hydrofluorocarbons (HFCs). Their main advantage of zero Ozone Depletion Potential (ODP) and comparatively lower Global Warming Potential (GWP) have attracted growing amount of attention to mitigate environmental issues. This work adopts the computational method and takes the environmentally friendly refrigerants to investigate the heat transfer characteristics under widely used shear-stress transport (SST) model. A comprehensive comparison was performed at reduced pressure of 1.10 for supercritical fluids R515A, R1234ze(E) and R134a. The peaks of heat transfer coefficient occurred in the vicinity of pseudo critical temperature for all of these considered fluids;however, R134a resulted in higher heat transfer coefficient, Reynolds number and Prandtl number in comparison with R515A and R1234ze(E). The higher heat transfer coefficient of supercritical fluid R134a is owing to its thermophysical properties and the specific heat plays crucial role in the heat transfer of supercritical fluids. Owing to environmental issues, R515A can be a considerable replacement of R134a. R1234ze(E) is also promising alternative to R134a;however, safety issues should thoroughly concern its mild flammable characteristics.

关键词： Heat Transfer Supercritical Fluids Simulations R515A R1234ze(E) environmental friendly refrigerants

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