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本文将汲液多孔材料管组合成被动蒸发制冷墙,通过多孔材料的主动吸水、被动蒸发产生制冷效果。应用描述非饱和多孔介质热质迁移的数学模型,分析环境参数对多孔床内部非饱和场量的影响,以及它们与蒸发制冷量之间的内在联系,所得结果与实验结果相符合。实验分析了含湿多孔材料管的排列组合方式对墙体制冷性能的影响,以及多孔材料管的汲液特性。研究结果表明:室外环境参数对多孔介质表面和内部热质迁移影响较大。在遮阳、低的空气相对湿度和有天空辐射时有利于多孔介质表面的蒸发。含湿多孔管内部水分蒸发和水蒸气凝结,与其内部温度高低、温度梯度、含湿量和湿含量梯度相关联。受含湿多孔管排列方式的影响,通过组合墙体的气流分布,气流绕过多孔材料管方式,以及气流与多孔管表面之间的接触时间等存在差异,从而影响组合墙体的制冷特性。汲液多孔材料管的汲液高度受其倾斜角的影响较小。
In this paper, the drain pipe porous material pipe combination of passive evaporation refrigeration wall, through the active absorption of porous materials, passive evaporation to produce cooling effect. The mathematical model describing the heat and mass transfer in unsaturated porous media is used to analyze the influence of environmental parameters on the amount of unsaturated soil in porous beds and their internal relations with the evaporative cooling capacity. The results are in good agreement with the experimental results. The influence of arrangement and combination of pipes containing wet porous material on the cooling performance of the wall was analyzed experimentally. The results show that outdoor environment parameters have a great influence on the thermal and mass transfer on the surface of porous media. In the shade, low air relative humidity and sky radiation is conducive to the evaporation of porous media surface. Moisture porous tube internal water evaporation and water vapor condensation, and its internal temperature, temperature gradient, moisture content and wet content gradient associated. Influenced by the arrangement of the wetted porous tubes, the cooling characteristics of the composite wall body are affected by the differences in the airflow distribution in the composite wall, the manner in which the air flows around the porous material tube, and the contact time between the airflow and the porous tube surface. The height of the liquid drain pipe of the porous liquid drain pipe is less affected by the inclination angle.