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The study aimed to determine the contact resistance at the interface of material layers within building partitions by conducting thermal and geometric analyses, both of which influence heat flow. Authors specifically tested the effects of changes in surface emissivity and surface roughness on heat transfer via electromagnetic radiation between parallel surfaces of building materials. To achieve accurate modeling, reverse engineering tools, including an optical 3D scanner and CAD software, were utilized to create detailed three-dimensional representations of the wall system, capturing precise geometrical features. The analysis of surface roughness provided insights into the microstructural changes before and after applying a reflection-smoothing coating, which significantly reduced surface emissivity from 0.93 to 0.29. Heat transfer simulations were carried out using computational fluid dynamics (CFD) software, applying the finite volume method to account for variations in surface roughness, air gap thickness, and concrete types. Authors sought to explorate how changes in surface roughness influence heat transfer via electromagnetic radiation and, as a result, affect the thermal insulation of walls.
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