The building integration of photovoltaics (BIPV), as a key strategy of the forthcoming "Net Zero Energy Building", now promises unprecedented opportunities for the expressive language of the building and open to innovative technological scenarios the project of the building elements. The "Technology transfer" of these systems is one of the "causes materialis" of innovation in architecture and outlines important aspects of conceptual and performance evolution of eco-friendly envelope, subject of a growing functional accumulation and technological complexity, and increasingly multi-capacitive and interactive. The part of the research presented, it aims to outline some key aspects of the process of technological-constructive innovation of the building organism, connected to the use of photovoltaics (PV). The proposed contribution, starting from the definition of introductory classes of integrability of reference for the theme of BIPV, reports the study of specific sub-classes useful for evaluating the degree of constructive integration of photovoltaic systems in the building constructive elements. This work focuses on the schematization of different constructive approaches of BIPV, from those based on the principle of adaptation, optimization and stratification of the vertical enclosure or roofs with PV elements, up to those who represents the most advanced forms of innovation like unitary, multi-functional and polyvalent building elements. It follows a critical reading addressed by narrowing the main strategic forms of technological development of envelope with a brief summary of new concepts and emerging trends in the PV contemporary envelope, both in relation to innovation of morpho-typological and constructive nature, with the reference to some design experiments that show unprecedented spatial, functional and technological features of the building (luminescent shells, media facade, ultra-thin membrane).
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