Abstract
A novel micro heat pipe array was used in solar panel cooling. Both of air-cooling and water-cooling conditions under nature convection condition were investigated in this paper. Compared with the ordinary solar panel, the maximum difference of the photoelectric conversion efficiency is 2.6%, the temperature reduces maximally by 4.7℃, the output power increases maximally by 8.4% for the solar panel with heat pipe using air-cooling, when the daily radiation value is 26.3 MJ. Compared with the solar panel with heat pipe using air-cooling, the maximum difference of the photoelectric conversion efficiency is 3%, the temperature reduces maximally by 8℃, the output power increases maximally by 13.9% for the solar panel with heat pipe using water-cooling, when the daily radiation value is 21.9 MJ.
Highlights
Solar cell is the core component of photovoltaic power generation system
A novel micro heat pipe array was used in solar panel cooling
Compared with the ordinary solar panel, the maximum difference of the photoelectric conversion efficiency is 2.6%, the temperature reduces maximally by 4.7°C, the output power increases maximally by 8.4% for the solar panel with heat pipe using air-cooling, when the daily radiation value is 26.3 MJ
Summary
The photoelectric conversion efficiency of a solar cell is about 6-15% in commercial application [1]. Most of the radiation has been converted into heat, which results in high temperature of the solar cell and low efficiency even inefficiency. Long-term high temperature of the solar cell will shorten its service life. There are large thermal contact resistance existing between conventional column heat pipe and flat solar panel, which will results in low heat transfer efficiency. The novel micro heat pipe array proposed by Zhao et al [8,9] has a good contact with the solar panel, as its flat shape. The heat pipe has higher heat transfer efficiency and a uniform temperature distribution that can solve the solar panel cooling issue
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