Energy performance analysis and optimization of a coupled adsorption and absorption cascade refrigeration system

被引:27
作者
Chen, W. D. [1 ]
Chua, K. J. [1 ]
机构
[1] Natl Univ Singapore, Dept Mech Engn, 9 Engn Dr 1, Singapore 117576, Singapore
基金
新加坡国家研究基金会;
关键词
Low-grade waste heat recovery; Energy cascade utilization; Adsorption chiller; Energy optimization; Combined cooling and power system; WASTE HEAT; OPTIMAL-DESIGN; RECOVERY; CHILLER; EXERGY; IMPROVEMENT; SIMULATION; SELECTION; STRATEGY; CCHP;
D O I
10.1016/j.apenergy.2021.117518
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
An energy cascade utilization system is an advanced technology that recoveries waste heat energy efficiently. However, research on cascade systems by utilizing waste hot water with 60-100.C is still considerably lacking in the literature. Specifically, this paper investigates the waste heat recovery performance of a multistage coupled absorption chiller (ABC)-adsorption chiller (ADC) cascade system. The proposed ABC-ADC cascade system is capable of producing potable water and three streams of chilled water under different temperature settings. Firstly, the experimental analysis is judiciously carried out on a four-bed two-evaporator ADC subsystem prototype. Key results reveal that the ADC's maximum specific daily water production is 10.5 m(3)/day/ton. Subsequently, the ABC-ADC cascade system's performance is experimentally analysed and optimized. The achievable maximum cooling coefficient of performance (COPc) is obtained to be 0.55. Additionally, a general method is proposed to optimize the subsystem's cooling capacity combination of the ABC-ADC cascade system in search of an optimal COPc. The results indicate that the optimized COPc can further be enhanced by around 20%. The performance efficiency of an optimized ABC-ADC cascade system incorporating a microturbine system is then investigated. Compared to the experimental ABC-ADC cascade system, the optimized system' total coefficient of performance is demonstrated to improve by 18%. The primary energy saving ratio is also promoted from 9.8% to 18%. Moreover, 68.92% of the gas turbine's dissipated energy is able to be recovered by the optimized ABC-ADC system. As far as application is concerned, this cascade system has been demonstrated to be superior to standalone heat-driven chillers with great commercial potential for implementation in industries where low-grade waste heat is readily available.
引用
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页数:24
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