Performance improvement and multi-objective optimization of a two-stage and dual-temperature ejector auto-cascade refrigeration cycle driven by the waste heat

被引：4
作者：
Ye, Kai [1 ,2 ]
Liang, Youcai [1 ,2 ]
Zhu, Yan [1 ,2 ]
Ling, Xunjie [1 ,2 ]
Wu, Jintao [1 ,2 ]
Lu, Jidong [1 ,2 ]
机构：
[1] South China Univ Technol, Sch Elect Power Engn, Guangzhou 510640, Peoples R China
[2] Guangdong Prov Engn Res Ctr High Efficient & Low P, Guangzhou 510640, Guangdong, Peoples R China
来源：
ENERGY | 2024年 / 311卷
关键词：
Two-stage ejector; Auto-cascade refrigeration; 3E analyses; Zeotropic mixture; Waste heat-driven; EXERGY; ENERGY;
D O I：
10.1016/j.energy.2024.133429
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
This paper presents a two-stage and dual-temperature ejector auto-cascade refrigeration cycle (TEARC) driven by the waste hot water and low-pressure exhaust steam in chemical plants. In this cycle, a throttle valve is provided between the condenser outlet and separator inlet to regulate the composition and mass flow ratio of mixture refrigerant in the two evaporators. The specific enthalpies of refrigerant at the low-temperature (LT) evaporator and medium-temperature (MT) evaporator inlet are respectively reduced via the evaporative condenser and separator, leading to an enhancement in cooling capacity. Energy, exergy, and economic (3E) analyses are conducted to compare the performance between the TEARC and the basic two-stage and dual-temperature ejector refrigeration cycle (BTERC). At the basic operating condition, the TEARC has enhancements of 9.13 % and 9.95 % in COP and exergy efficiency than those of the BTERC. According to the multi-objective optimization results, it indicates that the TEARC's COP, , exergy efficiency, and levelized cost of cooling are respectively improved by 8.93 % and 5.67 % and reduced by 1.22 % compared to the BTERC at optimum operating conditions. The simulation results of the proposed cycle reveal a significant performance improvement and the potential for application in waste heat-driven refrigeration.
引用
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页数：16
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