Experimental Study on Thermal-gravity Driven Pumpless Organic Rankine Cycle System
In order to improve distributed energy efficiency,an experimental study on the pumpless Organic Rankine Cycle(ORC)driven by thermal-gravity is proposed.In this paper,the working principle and performance of multi-stage liquid pumping process are studied by combining simulation and experiment.An experimental system with two two-stage liquid pumping processes and preheating mode is built,and the system performance under different working conditions is analyzed.Results show that the liquid pumping processes have little influence on the pressure at the inlet of the expander,and meanwhile it can effectively increase the pressure of the fluid and realize the pressurized flowing process.The average power generation of the system is 194.5 W,the instantaneous thermal efficiency fluctuates between 2.2%-3.8%,and the average thermal efficiency and exergy efficiency are 3.0%and 11.8%,respectively.For the large-scale power generation system,considering that the large tank could realize the large flowrate for the liquid pumping process,the single stage liquid pumping process is adopted for the large-scale power generation system,and two tanks in parallel is utilized to ensure the continuous liquid supply.When the temperature of heating source and cooling source is 98.3℃and 21.5℃,the average power generation power reaches 8.8 kW,and the average thermal efficiency and exergy efficiency are 3.98%and 20.95%,separately.
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