This paper evaluates the thermal performance of building walls in Morocco’s hot and dry climatic zones. Two types of hollow brick walls, namely, single wall (Type A) and double wall (Type B), are examined. The objective is to identify the configuration that offers optimal thermal performance. Numerical simulations are conducted to analyze key thermal parameters, including time lag, decrement factor, and average inside surface heat flux. The results show that the double wall provides better thermal performance than the single wall which can result in lower heating and cooling costs and a more comfortable indoor environment. In fact, the time lag is extended by 5 h and the decrement factor is reduced by 33% for the double wall. On the other hand, a low emissivity covering lowers the overall thermal load during the day, enhancing interior thermal comfort and lowering building energy use.

本文评估了摩洛哥炎热干燥气候区建筑墙体的热性能。研究了两种类型的空心砖墙，即单墙（A 型）和双层墙（B 型）。目标是确定可提供最佳热性能的配置。通过数值模拟来分析关键热参数，包括时滞、衰减因子和平均内表面热通量。结果表明，双层墙比单墙具有更好的热性能，可以降低供暖和制冷成本，并提供更舒适的室内环境。事实上，双壁的时滞延长了 5 小时，衰减系数降低了 33%。另一方面，低发射率覆盖物降低了白天的整体热负荷，提高了室内热舒适度并降低了建筑能源消耗。