page_title: Climate-adaptive building shell
section_title: Based on the time frame scale
hierarchical_section_title: Climate-adaptive building shell / Categorization of CABS / Based on the time frame scale
caption_attribution_description: English: View of Milwaukee Museum from south-west approach
context_page_description: Climate-adaptive building shell is a term in building engineering that describes the group of facades and roofs that interact with the variability in their environment in a dynamic way. Conventional structures have static building envelopes and therefore cannot act in response to changing weather conditions and occupant requirements. Well-designed CABS have two main functions: they contribute to energy-saving for heating, cooling, ventilation, and lighting, and they induce a positive impact on the indoor environmental quality of buildings.
context_section_description: As dynamic technologies, CABS can show different configurations over time, extending from seconds up to changes appreciable during the lifetime of the building. Thus, the four types of adaptations based on the time frame scales are seconds, minutes, hours, and seasons 
  The variation that takes place just in seconds are found randomly in nature. Some examples may be short-term variations in wind speed and direction that may cause shifts in wind-based skins. An example of a shift that occurs within minutes is the cloud cover which has an impact on the daylight availability. Therefore, CABS that use this kind of energy may also fall into this category. Some changes that adjust in the order of hours are fluctuations in air temperature, and the track of sun through the sky (although sun movement around the sky is a continuous process, its track is done in this time scale). Finally, some  CABS can adapt across seasons, and therefore are expected to offer extensive performance benefits.
caption: Calatrava's Burke Brise Soleil in the Milwaukee Art Museum opens every day providing shade to the building  and closes every evening or when the weather conditions require
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