Green Energy Technology Innovation Park
1. Photovoltaic Thermal Solar Collectors (PVT)
The term PVT refers to solar thermal collectors that use PV cells as an integral part of the absorber plate. The system generates both thermal and electrical energy simultaneously. The number of the photovoltaic cells in the system can be adjusted according to the local load demands. In conventional solar thermal system, external electrical energy is required to circulate the working fluid through the system. The need for an external electrical source can be eliminated by using this hybrid system. With a suitable design, one can produces a self-sufficient solar collector system that required no external electrical energy to run the system. The air flowed through the first channel formed by the glass cover and the photovoltaic panel. Next it enters the second channel formed by the back plate and the photovoltaic panel. The first channel has compound parabolic concentrators to concentrate solar radiation. The second channel has fins that transfer the heat from the photovoltaic panel. This flow arrangement and the compound parabolic concentrators as well as the fins will increase heat removal from the photovoltaic panel and will enhanced the efficiency of the system. Experimental results show that the thermal and electrical energy output of the system improves with a double-pass system compared with a single-pass system. It has also been shown that the system with fins always performs better than conventional flat-plate collector. The efficiency increases from 8% to 14% if the fins with density 0.32 cm-1 are added to the flat-plate absorber.