earticle

영어

The temperature of PV modules integrated into building surface will rise as it is more difficult to expel the heat from PV module compared to stand alone installation in open structure. The PV module temperature takes an effect on the performance of the PV system: the high temperature will decrease the electricity generation of PV system. The hot air extracted from the space between PV modules and the building envelope can be used as a heat source in buildings. The release of hot air from this space will enhance the performance of the BIPV system as it lowers the temperature of the PV modules. The type of solar collector that utilizes these aspects is known as a PVT (photovoltaic/thermal) solar collector that combines PV modules and solar thermal air collectors. It is important to raise the air temperature from the PVT air collector that is related to lowering the PV module temperature. This paper compares the experimental performance of three different types of air-type PVT collectors that can be integrated into a roof structure. The base model with a 10cm gap of air space for forced ventilation and two other models with aluminum fins and copper fins, respectively, attached to a PV module to enhance the thermal performance of the collector. The experimental results showed that the use of fins improved PV's electrical efficiency which was 8～15% higher compared to that of the base model. Also, the thermal efficiency of the improved models was 23～53% higher compared to that of the base model. It is claimed that the improved PVT models with metal fins attached yield higher thermal and electrical efficiency than the base model, with better performance by enhancing heat transfer.