Abstract
ABSTRACTTo determine the thermal effects of an oscillating mist fan (spraying 86 L/h of droplets with 25 µm mean diameter) on worker comfort, its effects on the thermal environment were measured in a large indoor space (37,500 m2/525,000 m3). It was found that the temperature dropped by 0.2–2.5 K, with local humidity increasing by 5%. Ventilation air-exchange calculations indicate that in hot summer conditions, an 8-h shift could be continuously cooled without creating high humidity, recovering to initial values after 16 h of ventilation at 0.3 ach. The cooling effect of the mist and fan was measured and compared with that of the fan. The mist and fan-cooling effect exceeded 100 W/m2 in all cases, while the mist and fan cooling exceeded the fan alone by 18 W/m2 on average, 24 W/m2 at the peak values and 11 W/m2 average during oscillation. The ASHRAE 55-2013 model is modified to include this additional cooling. Standard effective temperatures (SETs) are calculated with and without the mist fan-cooling effect. Linear approximations for reduction in SET were developed as a function of air temperature and mist-cooling effect. The deployment of this technology would improve thermal comfort for factory workers on hot summer days.
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