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首页> 外文期刊>Energy Conversion & Management >Experimental and numerical investigation of an advanced injection cooling concept for Organic Rankine Cycles1
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Experimental and numerical investigation of an advanced injection cooling concept for Organic Rankine Cycles1

机译：有机朗肯循环先进注射冷却概念的实验和数值研究

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摘要

The present experimental and numerical investigation is about an efficiency increasing and/or cost-reducing measure for Organic Rankine Cycle (ORC) systems. In such systems, a high proportion of the self-consumption of the system lies in the condensation of the working fluid due to the operation of ventilators or cooling pumps. Typically, the condenser heat exchanger is a component where the processes of desuperheating, condensation and, in some applications, also subcooling take place. Especially, the process of desuperheating requires huge heat exchanger surface areas due to the low heat transfer coefficient of the vapor phase. The proposed measure aims to reduce the share of desuperheating in the condenser through injection cooling in front of this component. On the one hand, the condenser surface area can be decreased, reducing investment costs. On the other hand, if the surface area is kept constant, the expander backpressure can be reduced due to the improved heat transfer in the condenser, leading to higher power output of the expansion machine. The present study demonstrates the benefit of this optimization measure with the aid of an experimental investigation that is complemented by a numerical analysis. Keeping the condenser surface constant, the condensation pressure can be decreased by up to 11.1%, by applying this injection cooling and together with R1233zd(E) as the working fluid, This, in turn, leads to an increase in net power output of 7.9% and consequently substantial additional revenue, especially with a large number of full load operation hours.
机译：本实验和数值研究是关于有机朗肯循环（ORC）系统的效率增加和/或降低效率。在这种系统中，系统的高比例的自耗在于由于呼吸机或冷却泵的操作而导致的工作流体的冷凝。通常，冷凝器热交换器是一种组分，其中降温，缩合和在一些应用中也发生过冷却。特别是，由于气相的低传热系数，脱气的过程需要巨大的热交换器表面积。该拟议的措施旨在通过在该组分前面注射冷却来减少冷凝器中的去皮中的份额。一方面，可以降低冷凝器表面积，降低投资成本。另一方面，如果表面积保持恒定，则由于冷凝器中的改善的传热，可以减少膨胀器背压，导致膨胀机的更高功率输出。本研究借助于使用数值分析补充的实验研究，表明了这种优化测量的益处。保持冷凝器表面常数，通过施加该注射冷却，将冷凝压力降低至11.1％，并与R1233ZD（E）作为工作流体，这反过来又导致净功率输出增加7.9 ％并因此大量额外收入，特别是大量全额负荷运行时间。

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