地板送风空调系统的热舒适性研究

Thermal Comfort Study of an Under-Floor Air-conditioning System

主要叙述了热湿环境中地板送风空调系统(UFAC)的热舒适性研究。通过测量假想平板网格节点上的热舒适性参数来预测气流的组织形式及办公室内空间的热力层特性;通过计算机来计算Fanger的舒适性指标以检测室内人员的热感觉;运用数学统计方法得出气流的速度和其他各项参数的关系。研究的主要成果显示,在地板送风空调系统中,送风口附近由于热力梯度较大存在着局部的不舒适性热感觉。另外,送风气流呈抛物线的特性将使气流形成一个滞留区。

This paper reports a thermal comfort study of an under-floor air-conditioning (UFAC) system in hot and humid climate. Thermal comfort parameters were measured at predetermined grid points within an imaginary plane to predict the airflow pattern of the supply air jet as well as to determine the occurrence of thermal stratification in the office space. Fanger's thermal comfort index was also computed to detect the occupants'thermal sensation. Statistical methods were applied to derive the relationship between air velocity and the other parameters. The main findings from the study reveal that with the UFAC system, occupants are likely to experience localised thermal discomfort near the supply diffusers due to the existence of large temperature gradients. In addition, a stagnant zone is discovered at sedentary level, which is caused by the parabolic airflow nature of the primary air jet.