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| 1 | Working fluid selection based on critical temperature and water temperature in organic Rankine cycle显示文摘This paper examines the thermal performance of working fluids in the entire evaporation temperature region up to near-critical temperature of working fluids in the organic Rankine cycle(ORC).The variation and tendency of the net power output with water temperature and correlated with the critical temperature of working fluids is investigated.Four characteristic curves of the net power output at particular water temperature(Tw_turn,Tw_app,Tw_tran and Tw_up)and their temperature difference(△T_turn=Tw_turn△Tcr,△T_app=Tw_app△Tcr)are obtained to evaluate the working fluids.The curve at'applicable water temperature(Tw_app)'is a demarcation to differentiate the net power output from low to high.The'upper water temperature(Tw_up)'is an upper limit of the water temperature to yield the higher net power output.A relation is built that the suitable water temperature is within the Tw_app and Tw_up of the working fluid. | LI XinGuo ZHAO WenJing LIN DieDie ZHU Qiang | 2015 | Science China(Technological Sciences)2015，58，1： | 8 |
| 2 | Recent progress on renewable energy in engineering thermophysics显示文摘This article portrays a concise review on the state-of-the-art advancements in methodologies and applications of engineering thermophysics for renewable energy, which includes wind energy, solar energy, geothermal energy, biomass energy, hydroelectric energy and CO2 capture, transportation and storage. | XU JianZhong JIN HongGuang SUI Jun LIU QiBin ZHANG MingMing | 2012 | Chinese Science Bulletin2012，57，34： | 3 |
| 3 | Research on hovering control scheme to non-circular orbit显示文摘An open-loop control system for hovering at any selected position on spacecraft orbit is first presented given that the satellite's engine provides continuous finite thrust.Actually,the hovering states are unstable considering perturbations and thrust errors,so a feedback sliding mode variable structure control,which is adaptive and chattering-free,is designed.Under this feedback control scheme,the high-frequency chattering phenomenon is avoided,while the system stays highly robust at the same time.Simulation results show that the feedback control thrusts are continuous and the steady-states error can be confined to 10 4 m at the presence of uncertain perturbations.Finally,the feasibility of realizing hovering orbits is analyzed taking the 'Moliya' and geosynchronous Earth orbit(GEO) satellites as examples. | WANG GongBo ZHENG Wei MENG YunHe TANG GuoJian | 2011 | Science China(Technological Sciences)2011，54，11： | 2 |
| 4 | Experimental investigation on a small-scale ORC system with a pump driven by internal multi-potential显示文摘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. | WANG ZiXuan WANG LiWei ZHOU Lei DU Shuai XU ShengZhi | 2021 | Science China(Technological Sciences)2021，64，8： | 1 |
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