Effect of air flow rate on capture air ventilation system

Effect of air flow rate on capture air ventilation system
Ventilation; Capture air ventilation system
Issue Date
The 11th International Conference on Air Distribution in Rooms
, 1807-1813
The object of this research is to investigate the performance variation of Capture Air Ventilation (CAV) system with respect to air flow rate. CAV system blocks the contaminated air from entering the inner space by supplying fresh air horizontally towards the hood where the overflowed contaminated gas tends to diffuse to other part of the room. It captures contaminated air in an area near the ceiling and this captured air is then exhausted through the ceiling outlet. For quantitative evaluation, heat and gas capture efficiencies are defined and calculated. Experiments are performed to obtain heat and gas capture efficiencies from the temperature and SF6 concentration that are measured at the exhaust locations. To find optimum driving conditions for a CAV system, numerical analysis is carried out. When the numerical results are checked with the experiment, they are in good agreement. Maximum differences between the two methods are 17% for hood system and 10% for CAV. It has been found that capture efficiency increases according to an increase of exhaust flow rate of the hood. Supply flow rate of ceiling nozzle, however, showed an optimum value for maximum efficiency, which has been found to be 100 cmh.
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