Numerical investigation of combined heat transfer through hollow brick walls
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Numerical investigation of combined heat transfer through hollow brick walls Bouchaib Jamal, Mohammed Boukendila , Lahcen El moutaouakil, Abdelhalim Abdelbaki, Zaki Zrikem Fluid Mechanics and Energetic Laboratory, Department of Physics, Faculty of Sciences Semlalia, Cadi Ayyad University, B.P. 2390, Marrakesh, Morocco Received: 19 July 2020 / Accepted: 5 October 2020 © Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The present study aims to investigate coupled heat transfer by natural convection, conduction and surface radiation through hollow brick walls. The numerical simulations are conducted for two typical walls built with hollow bricks in order to find the configuration that minimizes the heat gains or losses and then improves the thermal performances of the building. The outside vertical surface is submitted to an incident solar flux and outdoor environment temperature, while the inside surface is submitted to indoor environment temperature. The effects of the incident solar flux, the internal aspect ratio of hollow bricks and the thermal emissivity on the fluid flow and heat transfer through the building walls are analyzed. The results show that the hollow brick wall of type 1 improves the thermal resistance and leads to the lowest global heat transfer between the outside and inside of the building.
1 Introduction Providing the thermal comfort necessary for residents with minimum energy consumption is the main role of the building envelope. However, 50 to 60% of the global heat transfer is due to the heat gain and loss through the envelope [1]. Moreover, the wall is a major component of the building envelope that is responsible for 25–30% of heat loss [2]. Heat transfer depends on various parameters such as envelope structure, dimensions and orientation of building, wall structure types and climatic conditions. Therefore, it becomes essential to evaluate the correct thermal behavior of the building walls in order to minimize the heat gains or losses and then achieve the improvement in the thermal performances. During the last decades, several studies have been performed to investigate the thermal performances of hollow brick walls. Armando et al. [3] studied combined heat transfer through a multilayer wall. They revealed that heat loss through the wall is decreased by 44% when the thickness of the air layer was 10 cm. Sun and Fang [4] investigated numerically the heat transfer performance of concrete hollow bricks for different configurations. The effects of enclosure configurations with the same void volume fraction and the enclosure staggered were analyzed. Morales et al. [5] conducted a numerical study to improve the geometrical distribution of walls built with hollow clay bricks in order to optimize their
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thermal performance. Antoniadis et al. [6] employed the transient hot-wire technique to measure the thermal
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