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随着人们生活水平以及节能意识的提高,对建筑热工性能评价和建筑节能越来越重视。将建筑房间简化为含有多孔介质的双区域模型,因此,此类模型被应用到更多的领域。通过数值模拟展现了实际建筑环境中各物理条件对室内通风与热环境的影响,为室内舒适度的建设提供了依据。基于有限元法对含有多孔介质复合腔体这一类双区域模型的壁面热辐射与自然对流耦合换热问题在建筑房间内的应用进行了数值模拟分析。模拟了不同工况下多孔介质复合腔体内的流场和温度场随时间的变化情况。结果表明,表面热辐射对建筑房间内的自然对流换热有明显的增强作用;冬季与夏季,中间层与顶层不同的边界条件影响着室内的对流换热即方腔热环境的改变;多孔介质厚度d较大时能减弱传热,当到达一定值时影响不明显。
With people’s living standards and awareness of energy conservation, building thermal performance evaluation and building energy conservation more and more attention. Building rooms are reduced to two-zone models with porous media, so the model is applied to more areas. The numerical simulation shows the influence of physical conditions in the actual building environment on the indoor ventilation and thermal environment, which provides the basis for the indoor comfort. Based on the finite element method (FEM), the numerical simulation of wall heat radiation and natural convection-coupled heat transfer problems in a building room using a two-zone model with a porous media composite cavity is numerically simulated. The flow field and temperature field in porous media composite cavity under different conditions were simulated with time. The results show that the surface heat radiation significantly enhances the natural convective heat transfer in the building room. In winter and summer, the different boundary conditions of the middle layer and the top layer affect the indoor convective heat transfer, ie, the change of square cavity thermal environment. The porous media The larger the thickness d can reduce the heat transfer, when reaching a certain value, the effect is not obvious.