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The building facade not only provides the aesthetic signature of a building, but also important functions, such as daylight provision, glare protection, solar gain management and visual contact with the outside, which make the building usable and energy efficient. These functions often oppose each other, so the selection and design of facade systems and their control for a certain building application should depend on those functions that the designer wants to promote to the detriment of the other functions. In the context of the H2020 RenoZEB project, this paper presents a workflow for the conceptual planning of facade systems as applied to building retrofitting. The proposed workflow consists of analysing the space from the point of view of the functions of its facade. In a first step, the analysis of the case study leads to the definition of the design requirements, i.e. the relevance of the different facade functions and their priorities. The second step involves the selection of a suitable fenestration system and control strategy for the retrofit solution. In this step, an optimization process for the control strategy is proposed based on state-of-the-art thermal and daylighting simulations. In a third step, the annual performance of the retrofit solution is evaluated in order to check if the requirements are fulfilled. The proposed workflow is illustrated with a case study, in which the automation strategy of a retrofitted facade system is optimized for two different applications: a residential and an office building in Bilbao (Spain).

A workflow for retrofitting façade systems for daylight, comfortable and energy efficient buildings