In the spectrum beam split approach of combined solar photovoltaic thermal system (PVT), the complete solar spectrum is splitted. The unwanted part of the solar spectrum for photovoltaic (PV) applications is filtered out and is used separately as heat. In this work, some inexpensive, clear, and easily available selective fluids are identified which can be used as both volumetric heat absorbers and selective spectrum filters for C-Si-based PVT. The electrical performance of a C-Si solar PV cell using these fluid-based filters is analyzed using a solar simulator at 1 Sun, AM 1.5 G. To check the volumetric heat absorbing potential, the required thermophysical properties of these selected fluids are estimated using a solar radiation pyranometer and standard experiments. The study concludes that water, coconut oil, and hydrotreated silicone transformer oil are some of the potential beam splitters and heat absorbers suitable for C-Si based spectrum beam split PVT applications.
Non-concentrated solar photovoltaic thermal system act as a combined system, which will able to produce heat and electricity simultaneously. Both the electrical efficiency and heat gain of PV module depends linearly on the operating temperature. In this paper the theoretical estimation of efficiency of PV and heat gain from PV, through out the year is predicted. In the theoretical estimation it has been observed that the, maximum efficiency of PV can be improved by 2-3%, whereas average heat extraction is around 250-300 KW, from PV module. Position and performance analysis of PV at various tilt angles and at different conditions is estimated. The overall performance of PV can be improved by using appropriate concentrating system and advanced heat extraction methods.
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