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首页> 外文期刊>Building and Environment >Multi-target identification for emission parameters of building materials by unsteady concentration measurement in airtight micro-cell-type chamber
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Multi-target identification for emission parameters of building materials by unsteady concentration measurement in airtight micro-cell-type chamber

机译：气密微室型室内非定常浓度测量对建筑材料排放参数的多目标识别

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摘要

The purpose of this study is to develop a concurrent determination method that can estimate multiple emission parameters, that is, the emission rate, initial concentration and effective diffusion coefficient Dc in building materials, by a single unsteady concentration measurement. This study focused on the time history of VOC concentration in the gas phase that occurred when the target building material was covered with an airtight micro-cell. The VOC concentration in the micro-cell gradually increased and finally reached an equilibrium concentration. Under the condition of uniform distribution of initial concentration, the profile of VOC concentration in the micro-cell was determined by the order of the Dc value. A chart of the time history of VOC concentration as a function of Dc and thickness of building materials was prepared in advance by numerical analysis and then Dc was estimated by overlapping the measurement result with this chart. A chart of emission rate as a function of Dc and building material thickness was also prepared and the determination procedure of the emission rate taking into account the consistency between the 20 L small chamber method with in- and out-flow and the micro-cell method under an airtight condition was proposed. The estimation results of Dc and emission rate by this method were reasonably consistent with the results of the conventional method.
机译：这项研究的目的是开发一种同时测定方法，该方法可以通过一次非恒定浓度测量来估算建筑材料中的多个排放参数，即排放速率，初始浓度和有效扩散系数Dc。这项研究的重点是当目标建筑材料被气密性微电池覆盖时，气相中VOC浓度的时间变化。微电池中的VOC浓度逐渐增加，最终达到平衡浓度。在初始浓度均匀分布的条件下，微电池中VOC浓度的分布由Dc值的顺序确定。预先通过数值分析制备了VOC浓度随Dc和建筑材料厚度变化的时间历程图，然后通过将测量结果与该图重叠来估算Dc。还绘制了排放速率随Dc和建筑材料厚度变化的图表，并考虑了流入和流出的20升小室方法与微孔方法之间的一致性，确定了排放速率的过程提出在密闭条件下。该方法对Dc和排放率的估算结果与常规方法的估算结果基本吻合。

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