Strenuous attempts have been made to improve the efficiency of Building Integrated Photovoltaic Thermal (BIPVT). System design parameters, type ofcells, type of coolant and operating conditions are approaches which influence the efficiency of BIPVT. A new design concept of water-based PVT collector for building-integrated applications has been designed and evaluated. The results of simulation study of amorphous silicon (a-Si) PV/T module type are based on the metrological condition of Malaysia for one day in the middle of March; 2009.It indicates that at solar radiation between 700-900 W/m 2 , ambient temperature between 22-32°C and fluid flow rate of 0.02 kg/s, the thermal and electrical efficiency of the PV/T was able to reach 72% and 5%, respectively,.
