Exergy analyses of two and three stage cryogenic cycles

被引:1
作者
Atasbak, Musa [1 ]
Keven, Arzu [2 ]
Karaali, Rabi [1 ]
机构
[1] Bayburt Univ, Dept Mech Engn, TR-69000 Bayburt, Turkey
[2] Kocaeli Univ, Golcuk Vocat High Sch, Dept Vehicle & Transport Technol, Kocaeli, Turkey
关键词
cryogenic; exergy; local optimization;
D O I
10.1515/arh-2022-0134
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
Cryogenics has an important influence on industry and science. In this study, optimum working conditions are obtained by applying exergy analysis and local optimization methods to two- and three-stage vapor compression cascade cryogenic cycle. The first and second laws of thermodynamics, exergy analysis, and local optimization methods are applied to the two- and three-stage cascade cryogenic cycle. By considering the needs and demands, it is possible to create new cycles by adding new devices and/or new stages to these cycles. The results of the optimum operating conditions are obtained for the two- and three-stage vapor compression cascade cryogenic cycle. It is seen that to achieve high COP values and high efficiency; it is necessary to reduce the compression ratio of the compressor as much as the fluid allows. For the two-stage cycle, the minimum total work required for cryogenic cooling is around P (7) = 2,400 kPa. The COP value is 0.30 between P (7) = 2,400 and 2,800 kPa, and the maximum exergy efficiency is obtained around 0.235. It is seen operating the first-stage compressor at high pressures increases the total losses of the entire cycle from 7,500 to 18,550 kW. The increase in total exergy losses is around 247%, and operating the first-stage compressor at high pressures increases the exergy efficiency of the entire cycle. The increase in total exergy efficiency is around 160%. When the second-stage compressor is operated at low pressure, the COP value increases by 2%, the exergy efficiency increases by 20%, and the exergy losses decrease by around 40%.
引用
收藏
页码:190 / 204
页数:15
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