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A thermoelectric generator and water-cooling assisted high conversion efficiency polycrystalline silicon photovoltaic system |
Zekun LIU1,2, Shuang YUAN3, Yi YUAN3, Guojian LI4(), Qiang WANG4 |
1. Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China 2. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China 3. School of Metallurgy, Northeastern University, Shenyang 110819, China 4. Key Laboratory of Electromagnetic Processing of Materials of the Ministry of Education, Northeastern University, Shenyang 110819, China |
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Abstract Solar energy has been increasing its share in the global energy structure. However, the thermal radiation brought by sunlight will attenuate the efficiency of solar cells. To reduce the temperature of the photovoltaic (PV) cell and improve the utilization efficiency of solar energy, a hybrid system composed of the PV cell, a thermoelectric generator (TEG), and a water-cooled plate (WCP) was manufactured. The WCP cannot only cool the PV cell, but also effectively generate additional electric energy with the TEG using the waste heat of the PV cell. The changes in the efficiency and power density of the hybrid system were obtained by real time monitoring. The thermal and electrical tests were performed at different irradiations and the same experiment temperature of 22°C. At a light intensity of 1000 W/m2, the steady-state temperature of the PV cell decreases from 86.8°C to 54.1°C, and the overall efficiency increases from 15.6% to 21.1%. At a light intensity of 800 W/m2, the steady-state temperature of the PV cell decreases from 70°C to 45.8°C, and the overall efficiency increases from 9.28% to 12.59%. At a light intensity of 400 W/m2, the steady-state temperature of the PV cell decreases from 38.5°C to 31.5°C, and the overall efficiency is approximately 3.8%, basically remain unchanged.
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Keywords
photovoltaic (PV)
thermoelectric generator
conversion efficiency
hybrid energy systems
water-cooled plate (WCP)
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Corresponding Author(s):
Guojian LI
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Online First Date: 03 December 2020
Issue Date: 18 June 2021
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