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KMID : 1039220190290030343
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Journal of Korean Society of Occupational and Environmental Hygiene
2019 Volume.29 No. 3 p.343 ~ p.350
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An Experimental Study for the Improvement of Ventilation Conditions and Effectiveness in the Manufacturing Industry by Increasing the Mixing Factor (K-Factor)
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Lee Yun-Ho
Lee Seok-Won
Lee Kyoung-Ho
Kim Hyun-Wook
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Abstract
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Objectives: This study aims to identify whether ventilation conditions and their effectiveness can be significantly improved in an experimental chamber by increasing the mixing factor (K-Factor).
Methods: In a chamber with a volume of 1 m3, air velocity was measured at six different points with four roof fans in the upper part of the chamber being operated in order. The impact of the ventilation conditions was analyzed when the flow rates were increasing and the first inlet of the chamber was either open or closed. Smoke patterns were also observed at four corner points where ventilation was limited. Kruskal Wallis and Mann-Whitney tests were performed to compare air velocities measured in the chamber.
Results: The air velocities measured at only the third point increased significantly from 0.03±0.03 m/s (door open) and 0.05±0.06 m/s (door closed) with two fans, 0.08±0.08 m/s with three fans, and 0.09±0.09 m/s with four fans operating ( p <0.05). However, air velocities at the four corner points did not significantly increase. Smoke patters also showed that the open inlet of the chamber had no effect on improvement of ventilation conditions and effectiveness.
Conclusions: In this study, the air velocities at six points in the chamber did not significantly increase despite the increase in the mixing factor and flow rates of ventilation in the controlled environment. Therefore, the inflow of outdoor air throughout an open inlet and installation of a forced ventilation system can potentially increase the indoor air velocity and improve ventilation condition without an increase in the mixing factor.
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KEYWORD
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Experimental chamber, indoor air velocity, mixing factor, smoke pattern, ventilation condition
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