A Model to Estimate Effective Emittances and Absorptances
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.