ENERGETIC EFFECTS OF FAÇADE SURFACE GEOMETRY
Abstract: Designing an energy-efficient building with the use of passive design measures is not always possible due to the location, surrounding buildings or site layout. This can result in larger façade areas facing East or West and causes issues with the low sun altitude. The sun can thereby not be blocked constantly, since daylight is needed for the well-being of students and improves their study performance. It was expected to improve the energy efficiency, indoor thermal- and visual comfort by applying a vertical folded façade geometry of the envelope surface. Additionally, a vertical type of façade geometry was rarely touched by literature. Therefore, this study of the effect of a vertical folded facade was carried out in order to find an improved façade design. Thereby included a sensitivity analysis taking into account the heating- and cooling demand, electric lighting, daylight factor and overheating period as indicators. The analysis was conducted on a hypothetical classroom, based on references and located in Amsterdam, with one exterior wall facing East or West. The results showed that a folded façade slightly increases the energy efficiency and mainly the cooling demand of the classroom while the change in window type has a greater impact on the energy efficiency. Also enlarging the distance related to base line (flat façade) lowers the energy efficiency. Furthermore, the daylight conditions mainly decreased and the overheating period always exceeded the maximum allowed time, although a slight decrease was observed by applying a folding façade geometry. The holistic approach used in this work did not generate one specific design.
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