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基于浓度守恒原理建立了一次回风空调系统室内PM_(2.5)浓度模型,研究了过滤器分别安装在新风段、回风段和送风段时过滤效率和新风量的变化对室内PM_(2.5)浓度的影响。模拟结果表明:在室外PM_(2.5)浓度大于室内初始值的条件下,过滤器安装在送风段或回风段时,减少新风有利于室内PM_(2.5)污染控制,过滤器安装在新风段时,根据过滤器效率调节新风,过滤效率小于临界效率,减小新风有利于室内污染控制;在室外PM_(2.5)浓度小于室内初始值的条件下,过滤器安装在送风段或新风段时,增加新风有利于室内PM_(2.5)污染控制,过滤器安装在回风段时,也存在临界效率,过滤效率小于临界值,增加新风有利于室内PM_(2.5)污染控制。
Based on the principle of concentration conservation, a indoor PM_ (2.5) concentration model of a return air conditioning system was set up. The effects of filtration efficiency and fresh air volume on PM_ (2.5) Effect of concentration. The simulation results show that when the PM_ (2.5) concentration is higher than the indoor initial value, when the filter is installed in the air supply section or return air section, reducing the fresh air is beneficial to the indoor PM 2.5 pollution control. The filter is installed in the fresh air section , Adjust the fresh air according to the filter efficiency, the filtration efficiency is less than the critical efficiency, reduce the fresh air is conducive to indoor pollution control; when the outdoor PM_ (2.5) concentration is less than the indoor initial value, the filter is installed in the air supply section or the fresh air section The increase of fresh air is beneficial to the indoor PM 2.5 pollution control. When the filter is installed in the return air section, there is also a critical efficiency. The filtration efficiency is less than the critical value. Adding fresh air is beneficial to the indoor PM 2.5 pollution control.