Performance analysis and optimization of a new two-stage ejector-expansion transcritical CO2 refrigeration cycle
Performance analysis and optimization of a new two-stage ejector-expansion transcritical CO2 refrigeration cycle
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DOI：
10.1016/j.ijthermalsci.2009.01.013
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发表时间：
2009-10
影响因子：
4.5
通讯作者：
M. Yari
中科院分区：
文献类型：
--
作者：
M. Yari
本文提出了一种新的两级喷射膨胀式跨临界CO2（TRCC）制冷循环结构，该循环采用内部换热器和中间冷却器来提高循环性能。基于热力学第一、第二定律对该循环的性能进行了理论分析。结果表明，与常规两级跨临界CO2循环相比，新型两级循环的COP和第二定律效率提高了12.5 ~ 21%。研究结果表明，基于新的两级跨临界CO2制冷循环，可以显著提高两级跨临界CO2制冷的性能。因此，从热力学和技术角度来看，新型两级制冷循环是一种很有前途的制冷循环。已使用蒸发器和气体冷却器出口温度的回归分析，以开发最大COP、最佳排放和级间压力以及卷吸比的数学表达式。
In this paper, a new two-stage configuration of ejector-expansion transcritical CO2(TRCC) refrigeration cycle is presented, which uses an internal heat exchanger and intercooler to enhance the performance of the new cycle. The theoretical analysis on the performance characteristics was carried out for the new cycle based on the first and second laws of thermodynamics. Based on the simulation results, it is found that, compared with the conventional two-stage transcritical CO2cycle, the COP and second law efficiency of the new two-stage cycle are about 12.5–21% higher than that of conventional two-stage cycle. It is also concluded that, the performance of the new two-stage transcritical CO2refrigeration can be significantly improved based on the presented new two-stage cycle. Hence the new two-stage refrigeration cycle is a promising refrigeration cycle from the thermodynamically and technical point of views. A regression analysis in terms of evaporator and gas cooler exit temperatures has been used, in order to develop mathematical expressions for maximum COP, optimum discharge and inter-stage pressures and entrainment ratio.