Thermal Isolated BIPV Design Matched to A-Si Modules Behaviours

In BIPV design with c-Si cells, ventilation is important in order to keep cells as cool as possible. To allow a good ventilation it is therefore generally preferred to mount the modules separated from the existing roof. In the case of sloped roofs the modules are superimposed to the existing roof and for flat roofs separated tilted mounting structures with wind loads are used instead, but both are no real building integrations. In this paper we analyse the behaviour and the energy yield of a 15.36 kWp PV system based on flexible triple-junction thin-film amorphous silicon modules laminated together with a single ply roofing system based on a flexible polyolefine (FPO) membrane which acts as a waterproofing system. Compared to c-Si modules, a thermal isolated BIPV design matches the best the thermal behaviour of a-Si technologies