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首页> 外文期刊>Energy Conversion & Management >Parametric analysis and thermo-economical optimization of a Supercritical- Subcritical organic Rankine cycle for waste heat utilization
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Parametric analysis and thermo-economical optimization of a Supercritical- Subcritical organic Rankine cycle for waste heat utilization

机译：用于废热利用的超临界 - 亚临界有机朗朗季节的参数分析和热经济优化

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摘要

The Supercritical-Subcritical organic Rankine cycle could combine the superiorities of supercritical ORC and dual-pressure organic Rankine cycle to recover more heat and improve the system performance. The parametric analysis and thermo-economical optimization of a Supercritical-Subcritical organic Rankine cycle using R1234ze has been investigated in this study. The effects of five key operation parameters on the thermodynamic performance and economical factor are examined. A single-objective optimization for maximizing net work output, maximizing exergy efficiency and minimizing UA(sys) (heat transfer requirement) is examined and compared. The bi-objective optimization for maximizing exergy efficiency and minimizing UA(sys) simultaneously is also addressed. Research demonstrates that the net output power increases first and then decreases as supercritical stage temperature and supercritical stage pressure. UA(sys) decreases first and then increases with the supercritical stage temperature. The lower UA(sys) does not mean the higher net power output or exergy efficiency. A higher supercritical stage pressure and temperature are detrimental to system economic performance, while a higher condensation temperature can benefit improving system economic performance. The Pareto-optimal solutions for exergy efficiency and UA(sys) are 61.25% and 20.08 kW/K, respectively.
机译：超临界亚临界有机朗肯循环可以将超临界兽人和双压有机朗肯循环的优越性结合起来，以恢复更多的热量并改善系统性能。本研究研究了使用R1234ZE的超临界亚临界有机朗朗甘氨酸循环的参数分析和热经济优化。研究了五个关键操作参数对热力学性能和经济因素的影响。对净功耗最大化，最大化的高效率和最小化UA（SYS）（传热要求）进行单面优化，并进行比较。还解决了用于最大化高度效率和最小化UA（SYS）的双目标优化也是解决的。研究表明，净输出功率首先增加，然后作为超临界级温度和超临界级压力降低。 UA（SYS）首先降低，然后随着超临界级温度增加。较低的UA（SYS）并不意味着较高的净功率输出或漏洞效率。超临界级压力和温度较高，对系统经济性能有害，而较高的冷凝温度可以有利于提高系统经济性能。帕累托 - 最佳效率和UA（SYS）的最佳解决方案分别为61.25％和20.08 kW / k。

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