Reduction of real gas losses with a DC flow in the practical regenerator of the refrigeration cycle

被引：8

作者：

Cao, Qiang ^{[1
,2
]}

Luan, Mingkai ^{[1
]}

Huo, Bin ^{[1
]}

Li, Zimu ^{[1
]}

Sun, Zheng ^{[1
]}

Li, Peng ^{[1
]}

Wu, Yan ^{[1
]}

Wei, Li ^{[3
]}

Jiang, Zhenhua ^{[4
]}

机构：

[1] Tongji Univ, Sch Mech Engn, Inst Refrigerat & Cryogen, Shanghai 201804, Peoples R China

[2] Tongji Univ, Shanghai Key Lab Vehicle Aerodynam & Vehicle Ther, Shanghai 201804, Peoples R China

[3] Tongji Univ, Sch Elect & Informat Engn, Dept Elect Engn, Shanghai 201804, Peoples R China

[4] Chinese Acad Sci, Shanghai Inst Tech Phys, 500 Yu Tian Rd, Shanghai 200083, Peoples R China

来源：

APPLIED THERMAL ENGINEERING | 2021年 / 183卷

基金：

中国国家自然科学基金;

关键词：

Real gas effects; Practical regenerator; Refrigeration cycle; DC flow; Efficiency;

D O I：

10.1016/j.applthermaleng.2020.116123

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A working fluid behaves more like a real gas as the refrigeration temperature gets close to or below its critical temperature, and such real gas effects seriously degrade the refrigeration efficiency. Previous theoretical study has found that imposing a direct-current (DC) flow in an ideal regenerator improves the coefficient of performance (COP) significantly. However, factors in practical regenerators bring about profound influences on the DC flow, and its value deviates severely from that in ideal regenerators. In this paper, three factors are identified, and their effects are estimated based on specific simulations on regenerators. The expression of the DC flow and the COP are derived. Experimental measurements about the DC flow are carried out with a pulse tube refrigerator, and the COP at the temperature range of 4-7 K is found to be improved by a maximum value of 83%. It is the first time to provide a direct experimental evidence of reducing real gas losses with a DC flow in the regenerator. Further discussions on improvement potentials of the refrigeration performance and the liquefaction rate show that it should be a realistic way to utilize a DC flow in regenerative refrigeration systems.

引用

页数：11

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