This study presents experimental results on Photovoltaic-thermal (PVT) solar systems, the commercial photovoltaic (PV) panels used as solar absorbers in PVT collectors, which are amorphous and multi-crystalline silicon. Testing was done with outdoor experiments in the climate of Bangkok corresponding to energy consumption behavior of medium size Thai families. The experimental results show that the thermal recovery of amorphous silicon PVT collector is almost the same as that of multi-crystalline silicon PVT collectors while electricity generation of multi crystalline silicon PVT is 1.2 times as much as that of amorphous silicon PVT. The maximum of heat gain from the PVT systems were obtained in March in summer. It was found that PVT collectors of unit area annually produced 1.1 × 10 3 kWh/m 2 .year of heat and 55-83 kWh/m 2 .year of electricity, respectively. The results show that annual average solar factor of hot water supply is 0.45 for unit collector area. Economical evaluation based on energy costs in Thailand was conducted, which estimated the payback time would be 7 and 14 years for a-Si PVT and mc-Si PV, respectively.
This paper reports the development of a PhotovoltaiwThermal (PV/T) system in Thailand, The system uses amorphous silicon (a-Si) solar cells as the sunlight absorber. The system was first developed in Thailand by NSTDA (National Science and Technology Development Agency).The objective of developing PV/T system in Thailand is to reduce the total energy consumption in Thailand by using free energy such as solar radiation. The advantages of PV/l system are generating both electricity and heat at the same time by the same unit. The initial cost of the system can be reduced over 25% when compared with the conventional PV and Thermal generation system. Therefore, the pay back period is faster for this system. Another objectives are to sbdy the energy saving by using a-Si PVR solar collector system which use a-Si instead of the black Chrome coated absorber, which is expensive and to study its performance under tropical climate such as Thailand.Up to now, three pilot PV/ l systems were installed at government divisions in Thailand by difference type of applications.
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