Heat transfer Simulations and Optical and Electrical Measurements and Analyses for the High-efficiency Concentrated Optical Module

• Main Authors: Cin-YiLin, 林欽毅
• Other Authors: Jen-Fin Lin
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/71392758056577507188

碩士 === 國立成功大學 === 機械工程學系碩博士班 === 101 === This study is divided into two parts. The first part is to using the finite element software (Comsol Multiphysics) to analysis the temperature distribution and thermal deformation of the optical module by light irradiance, and calculate the possible power loss of the optical module. The second part is measurements the optical performance of the optical module by solar simulator and sun light. First, simulate the temperature distribution and thermal deformation when solar cell had no cooling fin. Using two different irradiance as heat source in Comsol, it’s simulated by optical software (TracePro) in two different concentration lens (Fresnel lens and Aspheric lens). The temperature is higher and Hot-spot effect is quite obvious when use aspheric lens, therefore the optical module in this study is using Fresnel lens as concentration lens. Analog optical module with cooling base and the boundary condition is no wind and convection coefficient is 20W/m2K respectively. The highest temperature is 40.17℃ and 31.67℃, at this temperature, the maximum power of the optical module will reduce 0.088W and 0.03W respectively. The optical performance of the optical module was measurement by solar simulator and sun light. Due to inefficiency, through ray tracing simulation finding the secondary optical element (SOE) has total reflection and the incident angle on the solar cell surface from the reflector is too large. The efficiency will decrease by cosine function when incident angle getting large, and the area ratio of Fresnel lens and reflector is 1/6. So the big area of reflector can’t provide useful efficiency. It’s decreased the optical module’s efficiency. Use the arimaeco’s Fresnel lens cover with diameter of 70mm to confirm the optical module’s efficiency. The maximum power is 0.655W when the direct normal irradiance (DNI)is 742W/m2 and the efficiency is 23%.