Thermal performance labeling of fenestration and glazing for residential buildings in Brazil

Reference Presenter Authors
11-026 Fernando Simon Westphal Westphal, F.S.(Universidade Federal de Santa Catarina); A methodology to classify the thermal performance of fenestrations for residential buildings in Brazil was developed. Computer simulations of a building prototype were carried out in the Energyplus software with different weather files with the aim to evaluate cooling and heating degree-hours of discomfort when different sets of frames and glass are used. Parametric simulations were performed from the prototype by varying the type of material of the frame, represented by its thermal transmittance, and the type of glass, represented by its thermal transmittance, solar heat gain coefficient (SHGC) and visible transmittance. Each set of parametric simulations were repeated for three weather files of Brazilian cities with different levels of air temperature and solar radiation: Salvador, São Paulo and Porto Alegre. Output data of the simulation task were treated in electronic spreadsheet correlating degree-hours of discomfort with the physical parameters of the fenestration. As results, an equation was obtained for each climate zone, represented by each of the cities as reference for simulations. It was confirmed that even in different regions of Brazil, solar radiation is always the most significant parameter that influences the thermal performance of the building model, so the type of glass, and its solar heat gain coefficient is the main key in the fenestration labeling method. The labeling methodology allows categorizing fenestration in levels of A (better performance) to E (worse performance). Quality assurance tests were conducted through simulations of computational models of housing units and it was proven that in the case of artificially air-conditioned residential buildings, energy savings of more than 20% in energy consumption for cooling can be achieved when a fenestration level A is used in place of a level E unit. This benefit is primarily obtained with the use of selective glazing systems (coated glass).
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