Lyon Infrastructure

S CHOICE BETWEEN THE TWO GREAT CLASSES OF PV TECHNOLOGIES

One of the ways of integrating photovoltaics into buildings is to incorporate it into facades, that is, onto walls or windows, which usually means – unless particular geometries such as “venetian blinds” or “sawtooth” are adopted – installation of modules vertically , and therefore with reduced access to solar radiation, which is all the more effective in producing energy the more it hits the modules perpendicular to their surface. Therefore, the use on facades is partly justified by aesthetic reasons and partly by the possibility of exploiting large surfaces, which partly compensates for the lower efficiency compared to the roof in energy production. The use of photovoltaics in skylights or for the construction of entire glass roofs (e.g. of gyms, shopping centers, etc.), on the other hand, represents above all an intelligent way of combining an economical (as efficient) use of photovoltaic technology with the possibility of creating structures with a fascinating designnte.

The most suitable photovoltaic technologies, from the point of view of the efficiency / price ratio, for integration into a building depend on numerous factors, starting with the location and orientation of the building. On a facade, for example, the expensive crystalline modules(on a traditional opaque support or embedded in glass) may be preferable to other solutions only if the building in question has a southern orientation (more or less 45 ° ). If the building does not have such an orientation, their use should be limited to the roof. The thin film, made with silicon cells or based on other semiconductor materials – including the innovative “organic cells” – is a technology that allows you to maximize the efficiency / price ratio in many situations: it is ideal for exploiting large surfaces, such as facades and roofs of commercial or industrial buildings, as well as for hot climates, where the performance of crystalline silicon declines by 5% every 10 ° of temperature above 25 ° C.

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