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Effect of Hole Configuration on Heat Transfer through a Hollow Block Subjected to Solar Flux

Fluid Dynamics & Materials Processing 2022年第5期18卷 1339-1348页

作者： mourad najjaoui Thami Ait-Taleb Abdelhalim Abdelbaki Zaki Zrikem Hassan Chaib Polydiscilinary Faculty of Ouarzazate Ibn Zohr UniversityOuarzazate638Morocco Faculty of Sciences Semlalia Cadi Ayyad UniversityMarrakesh2390Morocco

In this paper,some effort is provided to optimize the geometry of a concrete hollow brick(used in the construction of building roofs)in order to increase the related thermal resistance,thereby reducing energy *** analysis is conducted for three different configurations of the hollow concrete *** of conduction,natural convection and thermal radiation phenomena is ***,the flows are assumed to be laminar and two-dimensional for the whole range of parameters *** conservation equations are solved by a finite difference method based on the control volumes approach and the SIMPLE algorithm for velocity-pressure *** results show that the aspect ratio affects neither the nature of the fluid flow nor the number of convective ***,the extension of the circulation cells increases with this ***,the cavities with a large aspect ratio lead to significant reductions in the heat transfer through the hollow block,these reductions reaching approximately 14%.

关键词： Heat transfers coupled hollow block solar flux aspect ratio control volumes

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Coupled Conductive-Convective-Radiative Heat Transfer in Hollow Blocks with Two Air Cells in the Vertical Direction Subjected to an Incident Solar Flux

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Fluid Dynamics & Materials Processing 2022年第5期18卷 1399-1407页

作者： mourad najjaoui Thami Ait-taleb Abdelhalim Abdelbaki Zaki Zrikem Hassan Chaib Polydiscilinary Faculty of Ouarzazate Ibn Zohr UniversityOuarzazateMorocco Faculty of Sciences Semlalia Cadi Ayyad UniversityMarrakeshMorocco

This work presents the results of a set of steady-state numerical simulations about heat transfer in hollow blocks in the presence of coupled natural convection,conduction and *** with two air cells deep in the vertical direction and three identical cavities in the horizontal direction are considered(typically used for building ceilings).Moreover,their outside horizontal surface is subjected to an incident solar flux and outdoor environment temperature while the inside surface is exposed to typical indoor environment *** flows are considered laminar and two-dimensional over the whole range of parameters *** conservation equations are solved by means of a finite difference method based on the control volumes approach,relying on the SIMPLE algorithm for what concerns the coupling of pressure and *** effects of the number of cells in the horizontal direction and the thermal conductivity on the heat transfer through the alveolar structure have been *** results show that the number of holes has a significant impact on the value of the overall heat flux through the considered structure.

关键词： Numerical simulation heat transfer coupled hollow concrete block control volumes approach

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