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BRAGANÇA, Luís et al. The relative impact of different constructive components on the total building thermal load. In: INTERNATIONAL CONFERENCE ON PASSIVE AND LOW ENERGY ARCHITETURE, 18., 2001, Florianópolis. Anais... Florianópolis, 2001. p. 87-92.
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Abstract

One of the building designers main purposes is to reduce the energetic consumption of HVAC systems to the minimum strictly necessary. To achieve such goal an accurate evaluation of the building heating and cooling loads is needed, in order to correctly size these heating and refrigerating systems. The thermal load is the result of the space heat balance, where it must be considered the following terms: - Conduction heat exchanges through the opaque envelope (walls, roofs and floors); - Solar radiation gains and conduction heat exchanges through glazed areas; - Heat exchanges associated to indoor air renovation caused by forced ventilation, natural ventilation or air leakage; - Heat released by internal sources, such as equipments, lighting and occupants. The first step in the strategy to reduce the energetic consumption of HVAC systems is the identification of the components that lead to the higher energy consumption and of those which can be significantly reduced. So, it becomes essential the correct evaluation of the relative impact of different constructive components on the total building thermal load. In this work, it will be shown for different kinds of residential buildings, the relative weight of different thermal loads associated to the building components on the total thermal load. This work will enable the building designers with useful information about the priorities of concern and about the procedures to adopt in order to get an optimised thermal performance of each building component.
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