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Numerical study of the effects of human body heat on particle transport and inhalation in indoor environment

机译：人体热量对室内环境中颗粒传输和吸入影响的数值研究

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摘要

The inhalation of micron particles by a manikin standing in a ventilated indoor environment was numerically investigated using Computational Fluid Dynamics (CFD). Computations were conducted with various combinations of the free stream velocity (0.05-0.25 m/s representing typical indoor wind speeds.), occupant orientation relative to the free stream (back-to-the-wind or facing-the-wind) and heat transfer (isothermal or thermal flow). It was found that the body heat has a significant impact on the airflow field in the vicinity of the manikin by causing an upwards airflow on the downstream side of the manikin. It was also found that the effect of body heat on particle inhalation depends on the manikin orientation relative to the free stream. When the manikin is facing-the-wind, body heat has a little effect on particle inhalation and can be neglected. However for a back-to-the-wind orientation, the situation is much more complicated as the source height of inhaled particles depends on the speed of free stream. When the wind speed is low (0.05 m/s), the critical area is located near the floor level. The central height of the critical area then increases with increasing free stream speed until it reaches the nose height when the wind speed rises up to 0.25 m/s. This indicates that the body heat is an important consideration when investigating contaminant inhalation by human occupants in low-speed (typically less than 0.2 m/s) indoor environment.
机译：使用计算流体动力学（CFD）数值研究了人体模型在通风室内环境中通过人体模型吸入微米颗粒的情况。计算采用自由流速度（0.05-0.25 m / s代表典型的室内风速），相对于自由流的乘员方位（逆风或逆风）和热量的各种组合进行转移（等温或热流）。发现人体热量通过在人体模型的下游侧引起向上的气流而对人体模型附近的气流场具有显着影响。还发现体热对颗粒吸入的影响取决于人体模型相对于自由流的取向。当人体模型迎风时，人体热量对颗粒吸入的影响很小，可以忽略不计。但是对于逆风方向，情况要复杂得多，因为吸入颗粒的源高度取决于自由流的速度。当风速低（0.05 m / s）时，关键区域位于地板附近。然后，临界区域的中心高度随自由流速度的增加而增加，直到当风速上升至0.25 m / s时达到临界高度为止。这表明在调查低速（通常小于0.2 m / s）室内环境中人员吸入污染物时，人体热量是重要的考虑因素。

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  • 来源
    《Building and Environment》 |2013年第1期|1-9|共9页
  • 作者

    Qinjiang Ge; Xiangdong Li; Kiao Inthavong; Jiyuan Tu;

  • 作者单位

    School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, PO Box 71, Plenty Road, Bundoora, VIC 3083, Australia;

    School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, PO Box 71, Plenty Road, Bundoora, VIC 3083, Australia;

    School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, PO Box 71, Plenty Road, Bundoora, VIC 3083, Australia;

    School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, PO Box 71, Plenty Road, Bundoora, VIC 3083, Australia,Institute of Nuclear and New Energy Technology, Tsinghua University, PO Box 1021, Beijing 100084, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    body heat; airflow field; particle inhalation; wind speed; CFD;

    机译：体温;气流场颗粒吸入;风速;差价合约;

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