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Session: Poster session & Sponsor Exhibition
Session starts: Monday 07 October, 14:00

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Ye-Qiang Zhang (Beijing University of Technology)
Hang Guo (Beijing University of Technology)
Yu-Ting Wu (Beijing University of Technology)
Guo-Dong Xia (Beijing University of Technology)
Chong-Fang Ma (Beijing University of Technology)

Abstract:
In order to meet the demand of power in islands and remote regions without electricity, a new distributed trough solar power system based on single expander and organic Rankin cycle (ORC) is proposed. Contrast with popular trough solar power, this type of trough solar power is characterized by small output power from 1 to 500 kW and low temperature of working fluid. Traditional turbines are mainly designed for larger-scale applications and could not be used in so small power plants. Single screw expander can realize 1-200 kW range of output power and has many advantages, such as balanced loading of the main screw, long working life, high volumetric efficiency, high partial loading, low leakage, low noise, low vibration and simplify configuration, etc. R245fa is used as working fluid. A thermodynamic model was set up to calculate the output power and efficiency of ORC system based on the basis of adiabatic efficiency and mechanical efficiency of the single screw expander tested at previous experiment. The results indicate that the efficiency is improved with the increase of expansion ratio at the condition of 3.4MPa evaporating pressure. The efficiency with two-stage expansion is litter higher than single-stage expansion. The ORC efficiencies with regenerator markedly increase as the increase of superheat temperature and significantly higher than that without regenerator. The efficiency of concentrating collector is 72% at top tested before, and usually is 60%. The efficiency of ORC is 19.5%, then the peak efficiency of the trough solar power system is 14.04% and average efficiency is 11.7%.