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Numerical Simulation and Analysis on Stagnation Performance of All-glass Evacuated Collector Tubes

LIU Bai-hong;GAO Wen-feng;LIU Tao;LIN Wen-xian;XING Xiu-lan;HU Xiao-fang;Solar Energy Research Institute,Key Laboratory of Advanced Technique & Preparation for Renewable Energy Materials of the Ministry of Education of China,Yunnan Normal University;  
In this paper,FLUENT has been used to simulate and analyze the stagnation performance of all-glass evacuated tubes,which size is58×1 800 mm,with different emittance and vacuum degree.In addition,the accuracy of numerical simulation also being verified through test.The numerical simulation results show that the lower is the emittance,the smaller is the heat loss and the better is the thermal performance of all-glass vacuumed tubes. What′s more,the stagnation performance of all-glass evacuated tube decreases with the increase of the air pressure in the vacuum jacket.The stagnation change of all-glass evacuated tube mainly in the range of10-1~10Pa.When the air pressure is lower than10-1 Pa or greater than 10 Pa,the thermal performance change caused by heat conduction loss of air in the vacuum jacket is not obvious.Therefore the vacuum degree of air jacket should maintain in the order of 10-2 Pa in order to guarantee good thermal performance of all-glass evacuated tube.
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