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 presented.The newly proposed cycle consists of a GTP,a condenser,a...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 presented.The newly proposed cycle consists of a GTP,a condenser,an expander,and an evaporator.The 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 gravity.Such a component substitutes the conventional electricity-driven pump.Moreover,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%,respectively.The experimental setup of the ORC-GTP power system is built for low-grade thermal energy recovery.It 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.展开更多
基金This work was supported by the National Natural Science Foundation of China for the Distinguished Young Scholars(Grant No.51825602)the Major Scientific Research and Innovation Project of Shanghai Education Commission(Grant No.2019-01-07-00-02-E00044).
文摘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 presented.The newly proposed cycle consists of a GTP,a condenser,an expander,and an evaporator.The 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 gravity.Such a component substitutes the conventional electricity-driven pump.Moreover,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%,respectively.The experimental setup of the ORC-GTP power system is built for low-grade thermal energy recovery.It 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.
