Abstract
The purpose of the current article is to investigate the influence of air change number on the airflow homogeneity in a single office full-scale model room, where tangential air-distribution systems were used. Air speed, turbulence intensity, and air temperature measurements were performed. Then, different statistical methods were applied to evaluate the airflow homogeneity. Results showed that the average of turbulence intensity was independent of the air change number at ankle, knee heights, and head height of seated and head height of standing person. The draught rate numbers were calculated to evaluate the discomfort due to draught using Fanger's model and its maximum value was independent of the air change number. The draught at ankle height was within category A, while at the other heights was within category B and C. The transformed distribution function of the measured air speed was created in each measurement point to describe the airflow homogeneity. Results showed that the airflow was homogenous at ankle height. At knee height and head height of seated and standing person, the fluctuation tendency of air speed was the same. Our results could help designers to predict the airflow homogeneity in a tangential air-distribution system for room air distribution.
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