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Functionality of Active External Wall – Optimal Glazing / Bipv Ratio Taking Into Account Total Indoor Illuminance

This paper presents a model of the office building with different G/PV ratio (glazing / photovoltaic). It was assumed that the building is occupied during daytime (8-16) only for the purpose of typical office work with the computers. All the analyses were performed for moderate climatic conditions considering four different orientations of the facade. The following main criterion was taken into account for comparative analysis: required indoor illuminance level achieved through daylight and artificial supplementary lighting, as well as two additional conditions: maximum electricity produced by PV panels, minimum cooling energy requirements. The lighting criterion is limited by a minimum and maximum value of illuminance as well as other comfort indexes like, e.g. UDI. Maximum electricity and minimum cooling energy were obtained using standard dynamic software ESP-r. The analyses were conducted for fully opaque façade covered with PV panels as well as four cases with different G/PV ratio. In summer period the minimum G/PV ratio provides the required amount of daylight with the high level of electricity overproduced above artificial lighting demands. On the other hand, the maximum considered G/PV ratio triggers off temporary overestimated illuminance and considerably limits the energy generated by PV façade.