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Experimental investigation on a small-scale ORC system with a pump driven by internal multi-potential

Science China(Technological Sciences) 2021年第8期64卷 1599-1610页

作者： WANG ZiXuan WANG LiWei ZHOU Lei DU Shuai XU ShengZhi Institute of Refrigeration and Cryogenics Key Laboratory for Power Machinery and Engineering of M.O.E.Shanghai Jiao Tong UniversityShanghai200240China Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering MechanicsTsinghua UniversityBeijing100084China

In this study,a novel organic Rankine cycle(ORC)based on a pump driven by internal multi-potential,i.e.,gravity-assisted thermally driven pump(GTP),is *** newly proposed cycle consists of a GTP,a condenser,an expander,and an *** GTP component is composed of three top-down organized units,and it drives the transport of liquid from the low-pressure condenser to the high-pressure evaporator by thermal energy and *** a component substitutes the conventional electricity-driven ***,the modified scroll expander of the ORC-GTP system is experimentally studied,and the results show that the best conversion efficiency from shaft work to electricity and the best isentropic efficiency are 82.0%and 84.2%,*** experimental setup of the ORC-GTP power system is built for low-grade thermal energy *** is tested under the average evaporator outlet temperature of 96.4℃,106.1℃,and 108.8℃at the ambient temperature of around 25℃.The highest shaft work is achieved at 96.4℃evaporator outlet temperature,and the largest ratio of time lasting for power generation is 100%.Since the ORC-GTP system has much less sensible heat loss of the evaporator,the highest average thermal efficiency of the ORC-GTP reaches 3.57%,which is increased by 71.74%compared with the pumpless ORC system in the literature.

关键词： small-scale power system organic Rankine cycle gravity-assisted thermally driven pump scroll expander internal multi-potential

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