Abstract
This paper conducts a simulation study on the natural convection heat transfer process in square air-interlayer. According to the meteorological parameters in regions of hot summer and cold winter, two typical boundary temperature contrast is selected 6.5 and15 °C, using Fluent software to simulate condition of air-interlayer in 10 groups of material with thickness from 6 to 60 mm respectively to draw conclusion on how heat transfer quantity, thermal resistance and heat transfer coefficient change with different thickness of the air-interlayer. The result of simulation shows that when the square air-interlayer thickness was about 20mm, the variation rate of the total heat flux and heat transfer coefficient reach a turning point. Thermal resistance will change slowly with a small numerical value after this point. Therefore, the optimum square air-interlayer thickness is 20mm. Combined with practical engineering application, it provides better technical support for research and development of energy-saving building materials.
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