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Total air age: an extension of the air age concept

机译：总空气年龄：空气年龄概念的延伸

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摘要

Air age is an important index to evaluate indoor air quality in ventilated rooms. Current definition of air age is limited to indoor part, i.e., the air age at the inlets of air supply diffusers is assumed to be zero. This work extends the air age concept to the so-called "total air age" by considering the impact of air delivery process on air age. The air age in duct is solved using one-dimensional flow characteristic, which includes the mixing process between airflows with different ages. It is then coupled with the room air age which is solved using computational fluid dynamics technique. An iterative algorithm is proposed to calculate total air age in general ventilation systems and a direct method is further derived for systems with only one air handling unit. Two examples are given to demonstrate the calculation of total air age and the distributions of total air age are compared with those of traditional air age.
机译：空气年龄是评估通风室内空气质量的重要指标。当前对空气年龄的定义仅限于室内部分，即，假定空气供应扩散器进口处的空气年龄为零。通过考虑空气输送过程对空气年龄的影响，这项工作将空气年龄概念扩展到所谓的“总空气年龄”。管道中的空气年龄是使用一维流动特性解决的，其中包括不同年龄的气流之间的混合过程。然后将其与使用计算流体动力学技术解决的室内空气年龄相结合。提出了一种迭代算法来计算一般通风系统的总空气寿命，并进一步推导了仅具有一个空气处理单元的系统的直接方法。给出两个例子来说明总空气年龄的计算，并将总空气年龄的分布与传统空气年龄的分布进行比较。

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