Effect of U-shape external wall on heat transfer coefficients and building performances

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Abstract We keep the focus in this paper on the heat transfer coefficients affecting the performance of building for different climatic zones of Morocco. In this respect, the building model is developed using COMSOL Multiphysics based on the convective and radiative equations. Furthermore, the U-shape of the south external wall of the building is modified and tested according to three scenarios (A 0.25 m, B 0.75 m, and C 1.25 m). The results showed a significant increase of radiative heat transfer coefficient (HTC) by 33% and 64.62% by increasing the U-shape from 0.25 to 0.75 m and from 0.75 m to 1.25 m respectively. In fact, the convective coefficient decreases progressively in the U-shape wall. Hence, a maximum reduction of total energy consumption is observed as well as the HTC decreases.

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