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Investigation on the optimal condensation temperature of supercritical organic Rankine cycle systems considering meteorological parameters

机译：考虑气象参数的超临界有机朗肯循环系统最佳冷凝温度的研究

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摘要

Organic Rankine cycle (ORC) system is one of the important technologies for waste heat utilization with mid-to-low temperatures. Compared to the steam Rankine cycle (SRC) system, the fluctuation of the condensation temperature due to seasonal and meteorological factors has a more significant effect on the performance of ORC systems since the temperature difference between evaporation and condensation is relatively smaller. In this paper, supercritical ORC thermodynamic models under design and off-design conditions are established. The condenser is divided into pre-cooling section and condensation section. The simulation results show that the net output power and thermal efficiency decrease with the rise of cooling water inlet temperature in the condenser. It is found that the effect of higher and lower cooling water inlet temperature compared to the design condition on the system performance is asymmetric. In addition, considering the meteorological parameters, the optimal design condensation temperatures of ORC system in Beijing, Shanghai and Guangzhou are about 30-34 degrees C, 34-38 degrees C and 38-42 degrees C individually. Present results on the suitable design condensation temperature can provide reference for the practical application and optimization of ORC systems.
机译：有机朗肯循环（ORC）系统是中低温度下利用余热的重要技术之一。与蒸汽朗肯循环（SRC）系统相比，由于季节和气象因素引起的冷凝温度波动对ORC系统的性能影响更大，因为蒸发和冷凝之间的温差相对较小。本文建立了在设计和非设计条件下的超临界ORC热力学模型。冷凝器分为预冷段和冷凝段。仿真结果表明，净输出功率和热效率随着冷凝器中冷却水入口温度的升高而降低。发现与设计条件相比，冷却水入口温度的高低对系统性能的影响是不对称的。此外，考虑到气象参数，北京，上海和广州的ORC系统的最佳设计冷凝温度分别约为30-34摄氏度，34-38摄氏度和38-42摄氏度。目前关于合适的设计冷凝温度的结果可以为ORC系统的实际应用和优化提供参考。

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