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An investigation of air inlet types in mixing ventilation

机译：混合通风中进气口类型的研究

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Previous studies have shown that dispersion of contaminant concentrations strongly depends on air inlet types. However, these studies were performed computationally, not experimentally. Thus, the purpose of the current research is to obtain contaminant concentrations in a room, to perform qualitative and quantitative comparison for a wall jet (WJ) air inlet and a ceiling diffuser (CD) air inlet, and to determine more efficient inlet and outlet configuration. Here, the effect of air inlet types in mixing ventilation was investigated in an experimental room under two conditions, with no occupant and with an occupant present north of the source. A heated mannequin, producing a total heat load of 120 W, represented an occupant. Tracer gas (99.5% propylene) concentrations were monitored automatically at 144 sampling points with a photoionization detector. Three flow rates (5.5, 3.3, and 0.9 m~3/min) were employed. Experimental results for the 0.9 m~3/min are not reported here because concentration measurements with time in preliminary tests did not reach a stationary condition even over periods of 5 h due to dominant airflow by natural convection rather than by forced convection. Results have shown that the air inlet type is an important physical determinant to the distribution of airborne contaminant concentrations because they generate different airflow patterns and thus different spatial concentration patterns. This investigation enhanced understanding of the interactions of concentration field, airflow, and air inlet types. The findings of the study can be applied to practical areas; for example, it was shown that CD air supply system minimizes occupant exposure from hazards in office buildings, hospitals, and schools, if sources are located under ceiling diffuser inlets.
机译：先前的研究表明，污染物浓度的分散在很大程度上取决于进气口的类型。但是，这些研究是通过计算而非实验进行的。因此，当前研究的目的是获得房间内的污染物浓度，对壁式射流（WJ）进气口和天花板扩散器（CD）进气口进行定性和定量比较，并确定更有效的进气口和出气口组态。在这里，在两种情况下，在实验室内，没有乘员且乘员源位于源头以北的情况下，研究了进气口类型对混合通风的影响。加热的人体模型产生了一个乘员，该人体模型产生的总热负荷为120W。用光电离检测器在144个采样点自动监测示踪气体（99.5％的丙烯）浓度。采用三种流速（5.5、3.3和0.9 m〜3 / min）。这里没有报告0.9 m〜3 / min的实验结果，因为在初步测试中，随时间进行的浓度测量即使由于自然对流而不是强制对流的主导气流，甚至在5小时内都没有达到稳定状态。结果表明，进气口类型是决定空气中污染物浓度分布的重要物理决定因素，因为它们产生不同的气流模式，从而产生不同的空间浓度模式。这项研究增强了对浓度场，气流和进气口类型相互作用的理解。研究结果可应用于实际领域；例如，研究表明，如果空气源位于天花板扩散器入口下方，则CD空气供应系统可最大程度地减少办公楼，医院和学校中乘员受到危害的暴露。

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