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A Critical Review of Real Gas Effects on the Regenerative Refrigerators

Journal of Thermal Science 2021年第3期30卷 782-806页

作者： CAO Qiang LUAN Mingkai LI Peng WEI Li WU Yan Institute of Refrigeration and Cryogenics School of Mechanical EngineeringTongji UniversityShanghai 201804China Shanghai Key Laboratory of Vehicle Aerodynamics and Vehicle Thermal Management Systems Tongji UniversityShanghai 201804China Department of Electrical Engineering School of Electronics and Information EngineeringTongji UniversityShanghai 201804China

The regenerative refrigeration is an important reverse work-heat conversion cycle with a theoretical coefficient of performance(COP)identical to the Carnot *** regenerative refrigerators are capable of working down to 4 K and largely fulfill the refrigeration requirement of modern technologies in many fields,especially for space ***,the enthalpy flow associated with the pressure dependence,abbreviated as pressure-induced enthalpy flow,brought about by real gas effects degrades the theoretical COP of the refrigerator to below about 30% of the Carnot efficiency at the temperatures of below the critical *** paper reviews the long history of exploring the real gas effects which dates back to the 1970 s and continues to *** explorations of uncovering the loss mechanism and reducing such losses are *** theories that are in accordance with experimental results and simulation results are *** further carry out analyses on the expansion components,including the pulse tube and the clearance *** inferences are made in order to explore the long-lasting puzzles about real gas *** is emphasized that the underlying cause of the loss in the regenerator is an indirect effect of the real gas *** study about carrying out a direct verification of the theory is proposed.

关键词： real gas effects regenerative refrigerators loss mechanism reduction methods

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