Optimization of binary zeotropic mixture working fluids for an organic Rankine cycle for waste heat recovery between centrifugal compressor stages

被引:11
|
作者
Lin, Jingxiang [1 ]
Qin, Guoliang [1 ]
Yue, Han [1 ]
机构
[1] Xi An Jiao Tong Univ, Sch Energy & Power Engn, Xian 710049, Peoples R China
来源
ENERGY SCIENCE & ENGINEERING | 2020年 / 8卷 / 05期
基金
中国国家自然科学基金;
关键词
binary zeotropic mixture; optimized selection method; organic Rankine cycle; temperature glide; SYSTEM;
D O I
10.1002/ese3.629
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
The organic Rankine cycle is an effective way to recover low-temperature waste heat, and a mixture working fluid can effectively improve the performance of the organic Rankine cycle. In order to find the best pure and mixture working fluid quickly and accurately, thirteen pure working fluids and zeotropic mixtures of two of those fluids are selected to study the performance of the organic Rankine cycle, and the net power output is selected as the objective function. Through calculation and analysis, the best pinch temperature difference and evaporation temperature are determined. By calculating the approximate net power output, we find that the parameter (k center dot Delta s(5-1))(-1), which is determined by the physical properties of a working fluid, plays an important role in the pure working fluid optimization. In addition, the condensation temperature glide and (k center dot Delta s(5-1))(-1) together determine the optimized binary zeotropic mixture. As a result, R227ea and R227ea/hexane (0.98/0.02) are shown to be the optimal pure working fluid and binary zeotropic mixture. Using this mixture resulted in a net power output of 424.63 kW, which is 29.3% higher than that of the pure working fluid R227ea.
引用
收藏
页码:1746 / 1757
页数:12
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