根据槽式太阳能集热特性,选择R600和R245fa两种循环工质,以系统火用效率和单位能量产出成本为目标构建简单有机朗肯循环（BORC）和回热式有机朗肯循环（IHE-ORC）系统热经济性模型。利用非支配排序遗传算法进行双目标优化,采用熵权-TOPSIS法决策工质的两系统最佳热经济性,分析工质的两系统热经济性随运行参数蒸发压力、过热度和冷凝温度的变化。结果表明：在优化决策下,采用工质R245fa的IHE-ORC系统最佳火用效率和单位能量产出成本分别为54.11%、0.1548美元/kWh,热力性优势明显,采用工质R600的BORC系统最佳火用效率和单位能量产出成本分别为49.89%、0.1318美元/kWh,经济性表现较优;在运行参数变化范围内,IHE-ORC系统火用效率和单位能量产出成本均高于BORC系统,工质R245fa的系统火用效率显著较高,工质R600的系统单位能量产出成本相对较低。
Abstract
According to the heat collection characteristics of parabolic trough solar collector, R600 and R245fa are selected as circulating working fluids. The thermo-economic models of basic organic Rankine cycle （BORC） and the ORC system with internal heat exchanger （IHE-ORC） are established with the exergy efficiency and levelized energy cost （LEC） as objectives, respectively. Bi-objective optimization is conducted using the non-dominated sorting genetic algorithm. The optimal thermo-economic performance of two systems with two working fluids are obtained using TOPSIS with entropy weight method integrated. The variations of thermo-economic performance of the systems with evaporation pressure, superheat degree and condensation temperature are analyzed. The results show that, under optimization and decision making, when R245fa is used, IHE-ORC system has clear advantage in thermodynamic performance with the optimal exergy efficiency and LEC of 54.11% and 0.1548 $/kWh, respectively. When R600 is used, BORC system exhibits better economic performance with the optimal exergy efficiency and LEC of 49.89% and 0.1318 $/kWh, respectively. Within the variation range of operating parameters, the exergy efficiency and LEC of IHE-ORC system are always higher than those of BORC, and much higher exergy efficiency is obtained when using R245fa, while much lower LEC is achieved when using R600.
关键词
太阳能 /
朗肯循环 /
遗传算法 /
槽式太阳能集器 /
热力性 /
经济性
Key words
solar energy /
Rankine cycle /
genetic algorithms /
parabolic trough solar collecor /
thermodynamics /
economy
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基金
国家自然科学基金青年项目（51906119）; 内蒙古工业大学博士科研启动基金（DC2100000957）
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