Abstract
Although conventional hybrid solar systems recover heat from PV components, the temperature cannot be high because the temperature of PV should be low to keep the efficiency. In order to get high temperature, this study proposes a new type of hybrid system that decomposes power generation part and heat recovery part. It incorporates dye-sensitized cells for PV and non-imaging Fresnel lens for concentrating infrared rays that pass through the cell and the lens onto the thermal collector. To enhance the heat recovery, the absorber is held in an evacuated grass tube. Two types of dye-sensitized cells were examined to measure concentration performance. The results show that 20-25% of solar incidence energy attains the absorber when the cells with the TiO_2 thickness of 2μm and 9μm are applied. Heat collecting efficiency under filtered infrared incidence was measured. Predicted performance of the hybrid collector indicates that the thermal efficiency can achieve approximately 20% under the climate conditions in Tokyo.
