Abstract
Vertically perforated bricks were developed with the view to building environmentally friendly houses since they make insulating materials unnecessary. Indeed, walls can be constructed without any other materials than clay and mortar. Furthermore, they offer better mechanical properties than horizontally perforated ones. However, heat transfer in this geometry, and particularly the influence of the assembly method, is not totally known. In this numerical study, we propose to verify that convection heat transfer is negligible in the perforations. This condition is necessary to increase the thermal resistance of the brick. We then show that a masonry bedded on several strips does not penalize the thermal performance of the wall. A particular study of the ruptures concludes that the convection present in these regions is a local phenomenon preferable to the thermal bridges caused by continuous mortar joints.
Highlights
Perforated bricks are known to have better mechanical properties than the horizontally perforated ones
This article proposes a numerical study of the flow and the heat transfer in a geometry supposed to represent stacked vertically perforated bricks
Radiative transfer was not considered in this study, so heat was transferred through the brick by conduction in clay and supposed convection in air
Summary
Perforated bricks are known to have better mechanical properties than the horizontally perforated ones. A similar work by Turkoglu and Yucel [11] confirms that the average Nusselt number decreases as the number of partitions increases, approaching an asymptotic value What is more, it diminishes little as the aspect ratio rises, but average Nu increases with Ra. What is more, it diminishes little as the aspect ratio rises, but average Nu increases with Ra This succession of air cavities and conduction partitions could be a good representation, in two dimensions, of vertically perforated bricks. This article proposes a numerical study of the flow and the heat transfer in a geometry supposed to represent stacked vertically perforated bricks. They are assembled by joints constituted by varying width mortar and air strips. Particular attention will be paid to what exactly happens in the air area located in the joint and what the consequence of perforations communication are on the wall’s thermal resistance
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