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Type: Artigo de evento
Title: A Model To Estimate Effective Emittances And Absorptances
Author: Roriz V.F.
Caram R.M.
Roriz M.
Abstract: Typical bumps and hollows at the buildings surfaces, in roughness scale or like ripples on a tile, are obstacles that can significantly modify the behavior of these surfaces, in relation to the radiative flows. These flows are different that occurs in a perfectly smooth and flat surface. Therefore, the usual calculation procedures, which adopt the simplification that all surfaces of a construction are perfect plans, should apply corrections in the radiative properties. The absorptances and emittance resulting from these corrections could be called effective. This paper presents a simple method developed to evaluate these influences and exemplifies the importance of such aspects, presenting results of simulations developed in the EnergyPlus for a simple geometry building, over 1 year in the city of Brasilia. Adopting effective absorptances and emittance, simulation results show differences above 2.5°C in the internal air temperature, compared to those obtained ignoring the influences that the ripples of the tiles have on radiant flows. Considering the use of air conditioners, this could represent more than 20% variation in a energy consumption estimate.
Rights: fechado
Identifier DOI: 
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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