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| This result in an increase in the area occupied by the service core and thus negatively affects the NRA/GFA ratio. Studies indicate that shorter buildings of about 15-20 floors have a higher NRA/GFA ratio of 0.85 - 0.9 as compared to 50 storey buildings that have ratios of about 0.8 and 0.75 for the tallest building till date (Trabucco, 2008). The NRA/GFA ratio also depends on the placement of the service core, that is, the kind of service core configuration selected for the building. As mentioned earlier there are primarily two types of configurations - internal/ central service core and external/ peripheral service core placement. Buildings having peripheral service core placement have less floor plate efficiency as compared to their conventional central core position counterparts. This means that more built area will be required to achieve a floor plate efficiency of an equivalent central service core location building. This eventually means that the additional built area would require energy to lit, ventilate which directly affects the operational energy and materials for constructing which affects the embodied energy of the building. Thus, it is important to understand that the topic of NRA/GFA ratio not only has an impact on the economy of the tall building prototype but also on its energy consumption pattern. 5.3. Building Orientation and Service Core Placement As per the climatic conditions of a particular zone and the sun-path chart, tall buildings could be oriented along the best possible cardinal axis to minimise solar heat gain and maximise energy efficiency and improve the indoor environment. |
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