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.

本研究旨在研究自然对流，传导和表面辐射通过空心砖墙的耦合传热。对两个用空心砖建造的典型墙进行了数值模拟，以便找到使热量获取或损失最小化并进而改善建筑物的热性能的构造。外部垂直表面受到太阳光通量和室外环境温度的影响，而内部垂直表面则受到室内环境温度的影响。分析了入射太阳通量，空心砖的内部纵横比和热辐射率对通过建筑物墙壁的流体流动和热传递的影响。