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Numerical evaluation of the effect of air distribution system and location on performance of a portable air cleaner

机译：空气分配系统与便携式空气净化器性能影响的数值评价

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摘要

Indoor air quality (IAQ) has been an important issue in air conditioning researches. Ventilation and air cleaning are two approaches to improve the air quality in closed spaces. Portable air cleaners (PACs) are devices, which are very efficient in removing air pollutants and recently have gained much attention in IAQ applications. In this study, a numerical study was developed to investigate the gas removal of a portable air cleaner under different air distribution systems. SF6 was used as a tracer gas to model the dispersion of gaseous pollutants in a simulated office involving a thermal manikin as an occupant. Clean air delivery rate (CADR) exposure reduction effectiveness and age of air are the concepts that were used to evaluate the air cleaner performance. Simulation results showed that the cleaner was more efficient under mixing and the wall-mounted system and did not perform well under under-floor air distribution system (UFAD) system. Location of the device is a key parameter affecting its air purification when there is a ventilation system, and it had great influence on CADR in UFAD and mixing system. The cleaner must be located in high concentration zones, which have high age of air.
机译：室内空气质量（IAQ）是空调研究中的一个重要问题。通风和空气清洁是改善封闭空间内的空气质量的两种方法。便携式空气清洁剂（PAC）是设备，可在拆除空气污染物方面非常有效，最近在IAQ应用中获得了很多关注。在这项研究中，开发了一种数值研究，以研究在不同的空气分配系统下的便携式空气滤清器的气体去除。 SF6用作示踪气体，以模拟气态污染物在模拟办公室中的分散，涉及热人体作为乘员。清洁空气输送率（CADR）曝光缩减效率和空气年龄是用于评估空气净化器性能的概念。仿真结果表明，清洁剂在混合和壁挂系统下更有效，并且在地下空气分配系统（UFAD）系统下没有表现良好。当有通风系统时，该装置的位置是影响其空气净化的关键参数，并且对UFAD和混合系统的CADR有很大影响。清洁剂必须位于高浓度区域，其空气高。

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