When it comes to the topic of energy efficiency in buildings, the use and utilization of daylight plays an important role. Particularly in the area of non-residential buildings, especially in office buildings, plenty of energy can be saved by a well thought-out concept and planning of the daylight sources. However, the prerequisite for this is that the energy-efficient lighting concept has already been conceived in the design.
Because not only the location of the building and thus the external light conditions as well as the position of the sun are decisive for the daylight yield. The position of the building structures and their dependencies on each other, as well as the architecture of the building, also determine the incidence of light and the shading in the building. A well thought-out daylight and presence-dependent lighting control system optimizes the lighting conditions.
If the office building is characterized by many windows and a high level of daylight, the issue of cooling also plays a major role. To ensure that the building does not heat up too much in summer and the rooms do not overheat, care must be taken to ensure that the summer heat input remains low despite the high incidence of light. Section 14 of the Building Energy Act (GEG) specifies the minimum requirements for summer thermal insulation in new buildings. This is similar to DIN 4108-2 from the 2013 version of the Energy Saving Ordinance (EnEv).
Source: BauNetz
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