چكيده به لاتين
Heat transfer as an important physical phenomenon has widely application in different industries and devices such as solar systems. Recently, different researches has been done on solar systems. One one the newest solar devices that researchers focused on that is the photo voltaic thermal systems. In this system, by passing the fluid flow over the channel, the photovoltaic cells temperature reduces that it causes to improving the electrical efficiency of them. Furtheremore because of the temperature difference between the inlet and the outlet temperature of the fluid flow, the PVT system has a thermal efficiency. So because of that, this kind of solar systems needs to using some methods to improve the heat transfer rate and increasing the electrical and thermal efficiencies of them. For this purposr, in this research, using the metal foam implemented. The effect of different thicknesses of the metal foams, velocity of the flow and solar heat fluxes on the cells temperature, outlet temperature of the flow, electrical, thermal and overall efficiencies, pressure drop and velocity profiles has been investigated in this research. Results indicate that increasing the porous media thickness causes to decrease the cells themperature and increase their electrical efficiency. In return of that, the pressure drop increases too that is not desirable. Also increasing the thickness of the metal foam up to Rp=0.5, causes to increasing the outlet temperature and thermal efficiency.
In the optimum case, by using the metal foam, can achieve to 90% overall efficieny. It can be ssen that increasing of the solar heat flux, causes to decrease of 0.5-2% of the electrical efficiency of the cells.
