Study of Hybrid Photovoltaic Solar Thermal Systems During Summer Months in Bangladesh

Abstract

A hybrid photovoltaic (PW) solar system combines simultaneous canversion of the absorbed solar radiation into electricity and heat. In this study the design of an experimental PWdual systern, both air and water circulation with modifications in the air channel is presented. A thin metallic sheet (TMS) inside the air channel and painted black ribbed surfaces at the bottom of the air channel are placed. For obsertting the variations of heat transmittance with change of the shape of the ribs four experimental setups with a Trapezoidal, a Saw tooth forward, a Saw tooth baclauard ribbed surfaces and a flat plate have been used, Natural convection is applied instead of forced convection to increase the system net electrical output & thereby the overall system fficiency. All setups are of the same capacity, projected area and water heat extraction method and average depth. Performance study is carried out during the months of March to June, 2012 at I(JT campus, Gazipur, Bangladesh. Significant performance has been obtained with the above stated modifications. Natural convection is allowed to take place instead of fluid conyection. Results obtained in this study have been compared with available information in the literature.