Abstract The present study aims to investigate combined heat transfer by natural convection, conduction and surface radiation through double solid wall separated by an air layer. The outside vertical surface is submitted to an incident solar flux and outdoor environment temperature. The inside surface is submitted to indoor environment temperature. The radiative coefficient (hr), the convective coefficient (hc) and the overall thermal resistance (Rg) of the air layer were generated. The effects of the incident solar flux, the air layer thickness and the thermal emissivity on the heat transfer through the double wall were examined. The results showed that the use of an air layer thickness of 5 cm combined to a low emissivity of the structure surfaces would greatly help in reducing the energy consumption of buildings.

中文翻译：

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通过空气层分隔的双实体壁耦合传热的数值模拟

摘要 本研究旨在研究自然对流、传导和表面辐射通过被空气层隔开的双实体壁的组合传热。外部垂直表面受到入射太阳通量和室外环境温度的影响。内表面服从室内环境温度。生成空气层的辐射系数 (hr)、对流系数 (hc) 和总热阻 (Rg)。研究了入射太阳通量、空气层厚度和热发射率对通过双壁传热的影响。结果表明，使用 5 厘米厚的空气层与结构表面的低辐射率相结合，将大大有助于降低建筑物的能源消耗。