Research On Numerical Simulation Of Exhausted Heat Reeovery Unit Of Photoyoltaic Modules

Solar energy is one of the most important energy in all sorts of renewable energy. At present, photovoltaic power generation equipments have been widely used in every field, but the photoelectric conversion efficiency of photovoltaic module is low, and the conversion efficiency of photovoltaic module is inversely proportional to its temperature. In this paper, heat recovery unit of the photovoltaic module template which is made of aluminum is researched, that is, the fin of heat exchange equipment is bonded on the back of photovoltaic module template, the photoelectric heat in the process of change will be taken away by the fluid, and the heat will be used, so the temperature is reduced, and the template photoelectric conversion efficiency is improved.Two kinds of structure models of the heat recovery units are simulated, namely:the heat recovery unit of straight aluminum fin heat and the heat recovery device of serpentine aluminum fin. The working principle and physical model of the two devices are stated. The comparison of the simulation demonstrates that the serpentine heat recovery device of aluminum fin type is better than the straight heat recovery device of aluminum fin by three aspects of increase water temperatures, reducing the photoelectric temperature and improved conversion efficiency. Under same cases of the light intensity, the water temperature and the water flow speed, the best tube width, the best height, the best period and the wave (troughs) of the snake type aluminum flat are came out by simulation; Finally, taking a building for example, the energy saving rate of heat recovery device of the serpentine aluminum fin is calculated.The research results may be provided to the improvement of energy utilization efficiency in building integrated photovoltaic.