THE COMBINATION OF FIRE EXTINGUISH SYSTEM AND LOCAL EXHAUST SYSTEM IN FUME HOOD

Working with volatile chemicals creates numerous hazards for scientists in laboratory. Therefore, it isrestricted to do such works in a fume hood, which is designed to draw fresh air from the room into thehood and then out into the ventilation system, in order to prevent the accidents happened.According to the laboratory fire incidents investigation, the authors observed that a fire occurred infume hood will be a serious problem which has the potential to get much worse in the future as moreand complex laboratories are used and as the hood usage density increase. In this paper, the authorsconducted the numerical experiments by using 3D Computational Fluid Dynamics (CFD) method toevaluate the fire extinguish performance of CO2 system in fume hood. The simulation results showedthat the position of CO2 nozzle, exhaust air volume, position of sash had a significant effect on fireextinguish in hood. The innovative hybrid system combined fire extinguish system and local exhaustsystem was designed to ensure the flow pattern in hood could be well-controlled to prevent thecontaminant leakage from hood sash as the CO2 system is activated.