Abstract
Façades with building-integrated photovoltaics (BIPV) have the advantage that they can produce renewable electric energy. Compared with conventional façades, BIPV façades have therefore a valuable additional property that can generally contribute to increasing the degree of sustainability of buildings. A holistic assessment system for BIPV façade systems for office and administration buildings was developed in the framework of the project “MULTIELEMENT II” at the Fraunhofer Institute for Wind Energy and Energy System Technology (IWES) in Kassel, Germany. The aim of this research was a comparison of conventional façade systems with BIPV façade systems regarding different technical, economical, sustainability, and design criteria. This paper discusses the basic conditions for a holistic evaluation of BIPV façades in comparison with conventional façades. A method for the execution of a holistic evaluation and characteristic values for a comparison interpretation of results is presented. Façade systems are evaluated regarding both quantifiable and non-quantifiable properties by means of a Microsoft Excel-based evaluation tool. The tool facilitates the comparison and evaluation of planned or built façades with and without BIPV. The detailed evaluation results aim to facilitate the certification of BIPV façade systems in the framework of sustainable building certification systems such as the German DGNB.
Highlights
To facilitate the holistic assessment and evaluation of building-integrated photovoltaic” (BIPV) components in comparison with conventional building components an evaluation system is developed in the framework of the research project “MULTIELEMENT II”—enhancement of the building technology and building law specific basic conditions for PV-façade-components—at the Fraunhofer Institute for Wind Energy and Energy System Technology (IWES) in Kassel, Germany [1]
Up to ~20% of the total BIPV electricity production may be attributable to BIPV façade systems [6]
A holistic evaluation system (HES) for façades with and without BIPV was developed within the framework of the MULTIELEMENT II research project
Summary
The integration of photovoltaic construction elements in architectural structures and buildings is referred to as “building-integrated photovoltaic” (BIPV) [4,5]. About 3/4 of the total BIPV area potential is attributed to roof systems and 1/4 to façade systems. Up to ~20% of the total BIPV electricity production may be attributable to BIPV façade systems [6].
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