Papers by Author: Zi Long Wang

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Authors: Zi Long Wang, Hua Zhang, Hai Tao Zhang, Ye Li
Abstract: The research on automatic tracking solar concentrator photovoltaic system research has become one of issues of solar PV technology. Aiming at the problem of cell performance degradation which caused by the non-uniform illumination in the concentrating photovoltaic system. A dish-style concentrating photovoltaic system with second stage concentrator was designed and built in this article. The author measured the performance of three junction GaInP/GaInAs/Ge solar cell. According to experiment result, the Pmm of solar cell was increased from 1.54 W/cm2 to 1.88 W/cm2. The η of solar cell was increased from 32% to 34.1% separately that compared with the concentrating photovoltaic system which without the second stage concentrator at the same concentration ratio(150X)
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Authors: Zi Long Wang, Hua Zhang, Hai Tao Zhang
Abstract: Solar photovoltaic technology is one of main approach to the scale utilization of renewable energy, but it is still limited by its high cost of power generation and material shortage. Dish concentrating photovoltaic technology is promising for lowering the cost of power generation with its advantages of higher concentration and higher photovoltaic conversion efficiency and lower consumption of solar cells. A detailed description of dish concentrating photovoltaic system was given, which include concentrator and photovoltaic device. The application of dish concentrating photovoltaic system was particularized. Finally, a detailed discussion of its future potential.
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Authors: Zi Long Wang, Hua Zhang, Hai Tao Zhang
Abstract: Considering the problem of the concentrating solar cell efficiency restricted by the temperature. The closed two-phase thermosyphon was used to dissipation heat in concentrating solar cell at high heat flux, which adopted water as the working fluid. The temperature distribution of evaporator had significant effect on solar cell performance and heat pipe efficiency. A numerical simulation model of evaporator was established by FLUENT. During the computing process, the heat flux, filling ratio of liquid and saturation temperature were taken into account. It was found that the maximum temperature of evaporator was less than 85°C, when the solar cell operated in 140 to 180 suns, in the conditions of evaporator size (Length×Width×Height, 100×100×30 mm), the optimum charging ratio of liquid is between 27%~30%. The smaller saturation temperature would bring the better heat transfer characters.
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Authors: Hai Tao Zhang, Zi Long Wang, Hua Zhang
Abstract: Studying the thermal process of concentrating system could help us better understand how photovoltaic system works and seek ways to increase electricity production so as to reduce the cost of power generation. Energy transfer of concentrating photovoltaic system includes the process of light to electricity and the process of direct current to alternating current. This paper presents the factors that affect the energy transfer efficiency of the former one. And at last author points out that the key factor to increase the power production of photovoltaic system is controlling the temperatu- re of solar cell.
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