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Computational investigation on the factors influencing thermal comfort for impinging jet ventilation

机译：影响射流通风的热舒适性因素的计算研究

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摘要

Impinging jet ventilation (IJV) has been proposed to achieve an effective ventilation of an occupied zone in office and industrial buildings. For IJV systems, draught discomfort is the issue of most concern since it supplies cooled air directly to the occupied zone. This study investigated a number of factors influencing draught discomfort and temperature stratification in an office environment equipped with IJV. The factors considered were: shape of air supply device, discharge height, supply airflow rate and supply air temperature. The Response Surface Methodology (RSM) was used to identify the level of the significance of the parameters studied, as well as to develop the predictive models for the local thermal discomfort. Computational fluid dynamics (CFD) was employed to perform a set of required studies, and each simulation condition was determined by the Box-Behnken design (BBD) method. The results indicated that at a low discharge height, the shape of air supply device had a major impact on the flow pattern in the vicinity of the supply device because of the footprint from impinging jet, which consequently affected the draught risk level in the occupied zone. A square-shaped air supply device was found to result in lower overall draught discomfort than rectangular and semi-elliptic shapes. The RSM analysis revealed that the supply airflow rate had a significant impact on the draught discomfort, while the shape of air supply device and discharge height had moderate effects. The temperature stratification in the occupied zone was mostly influenced by the supply air temperature within the range studied.
机译：已提出冲击射流通风（IJV）以实现办公室和工业建筑物中占用区域的有效通风。对于IJV系统，通风困难是最令人关注的问题，因为它直接将冷空气供应到占用区域。这项研究调查了在配备IJV的办公室环境中影响吃水不适和温度分层的许多因素。考虑的因素包括：送风装置的形状，排气高度，送风量和送风温度。响应表面方法学（RSM）用于确定所研究参数的显着性水平，并开发局部热不适的预测模型。计算流体动力学（CFD）用于执行一组必需的研究，并且每种模拟条件都是通过Box-Behnken设计（BBD）方法确定的。结果表明，在低排放高度下，空气供给装置的形状对空气供给装置附近的流型有重大影响，这是因为射流撞击造成的足迹，从而影响了所占区域的通风风险水平。 。发现方形的空气供应装置比矩形和半椭圆形的总通风感更低。 RSM分析显示，送风量对吃水不舒适感有显着影响，而送风装置的形状和排气高度则有中等程度的影响。在所研究的范围内，占领区的温度分层主要受送风温度的影响。

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  • 来源
    《Building and Environment》 |2013年第8期|29-41|共13页
  • 作者

    Huijuan Chen; Bahram Moshfegh; Mathias Cehlin;

  • 作者单位

    Department of Building, Energy and Environmental Engineering,Faculty of Engineering and Sustainable Development, University of Gavle, 801 76 Caevle, Sweden,Division of Energy Systems, Department of Management and Engineering, Linkoping University, Linkb'ping, Sweden;

    Department of Building, Energy and Environmental Engineering,Faculty of Engineering and Sustainable Development, University of Gavle, 801 76 Caevle, Sweden,Division of Energy Systems, Department of Management and Engineering, Linkoping University, Linkb'ping, Sweden;

    Department of Building, Energy and Environmental Engineering,Faculty of Engineering and Sustainable Development, University of Gavle, 801 76 Caevle, Sweden;

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

    Computational fluid dynamics (CFD); Response Surface Methodology (RSM); Draught discomfort; Temperature stratification; impinging jet ventilation;

    机译：计算流体力学（CFD）;响应面方法（RSM）;吃水不适;温度分层;冲击射流通风;

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