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The un-even greenhouse-integrated semi-transparent photovoltaic thermal (GiSPVT) system is capable of producing electrical power and thermal power energy along with solar flux inside the greenhouse. The analysis is based on the energy balance equation as the function of climatic and design parameters. By using energy balance, a thermal characteristic equation of an un-even GiSPVT system has been derived. Moreover, an effect of packing factor of PV module and heat capacity of the product plant mass equivalent to water mass on overall exergy has been carried out in the paper. Following observations have been obtained: (i) There is a drop of 86% in the overall exergy of GiSPVT with an increase of packing factor from 0.22 to 0.80. (ii) An instantaneous thermal efficiency decrease with the increase of packing factor due to reduction in direct gain inside the GiSPVT system. (iii) Thermal characteristic equation similar to Hottel–Whiller–Bliss equation for flat plate collector has been derived.

An overall exergy analysis of un-even greenhouse integrated semi-transparent photovoltaic (un-even GiSPVT) system: a thermal modelling approach