The study of the heat transfer effect to the photovoltaics module efficiency

• Main Authors: Hong-Yao, Siao, 蕭宏搖
• Other Authors: Chang-Ren, Chen
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/91692809197069994019

碩士 === 崑山科技大學 === 機械工程研究所 === 101 === Although PV technology advances quickly, how to improve the conversion efficiency for today's research focus, and PV module temperature will affect the efficiency of power generation, different ventilation designs and phase change material have been used to reduce the temperature of the solar PV module, and increase the power output of the solar PV module. There are several designs to improve the heat transfer rate. At the left-right sides of the PV module were installed the air deflectors to have the uniform air flow, Apply the principle of hot air to rise, Boot up the air flow through the PV module back and compare the results with Collocation forced convection, and explores its influence on heat and electricity generation for PV modules. In addition to the comparisons with natural and forced convection, COMSOL software is also used for the analyses with different parameters such as wind speeds (1.6 m/s、3.6 m/s、6.6 m/s、9.6 m/s), heat transfer fluids (air and water), attached locations of PCM (inside the PV module and on the back PV aluminum plate). Two sets of PV module (230W polysilicon PV) for the comparison of power with original PV and revised PV at the same outdoor conditions. The results show that together with the air deflectors and one fan can effectively reduce the temperature of the solar PV module about 2 ℃ and the electricity upgrading about 1W. With fans, the solar PV module temperature could decrease to about 5-7°C and power generation upgrading about 2-3 W. Using the phase change materials (PCM) ( melting point of 45°C) packed by plastic bag with total thickness 4 mm could reduce the temperature 2.22°C. This study also finds out that the impact of module temperature to the electric conversion rate, the electric power generation decreases 0.25% per one degree of the module temperature increasing.