Thermal performance of an open thermosyphon using nanofluids for high-temperature evacuated tubular solar collectors: Part 1: Indoor experiment |
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Authors: | Lin Lu Zhen-Hua Liu Hong-Sheng Xiao |
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Affiliation: | a School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, PR China b School of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333001, PR China c Jiangsu Sunshore Solar Energy Industry Co. Ltd., Nantong 226301, PR China |
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Abstract: | An especial open thermosyphon device used in high-temperature evacuated tubular solar collectors was designed. The indoor experimental research was carried out to investigate the thermal performance of the open thermosyphon using respectively the deionized water and water-based CuO nanofluids as the working liquid. Effects of filling rate, kind of the base fluid, nanoparticle mass concentration and the operating temperature on the evaporating heat transfer characteristics in the open thermosyphon were investigated and discussed. Experiment results show the optimal filling ratio to the evaporator is 60% and the thermal performance of the open thermosyphon increase generally with the increase of the operating temperature. Substituting water-based CuO nanofluids for water as the working fluid can significantly enhance the thermal performance of the evaporator and evaporating heat transfer coefficients may increase by about 30% compared with those of deionized water. The CuO nanoparticles mass concentration has remarkable influence on the heat transfer coefficient in the evaporation section and the mass concentration of 1.2% corresponds to the optimal heat transfer enhancement. |
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Keywords: | Solar collectors Thermosyphon Nanofluids Heat transfer enhancement |
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