Performance Evaluation for Operation Scenarios of Supply and Exhaust System in Delaying Smoke Spread in MLCC Factory

Abstract

Downdrafts are generated indoors because of the water supply and exhaust equipment installed in the clean room of the MLCC factory. In the event of a fire, this downdraft may interfere with the exposure of combustion products, such as heat, smoke, and toxic gases generated from the fire source, to the smoke detector installed on the ceiling. There is a high risk of this adversely affecting people and damaging property, depending on the diffusion of the combustion product. In this study, we analyzed the smoke diffusion patterns according to the operation methods of the supply and exhaust facilities. Modeling was performed using a fire simulation program, and the performance of the water supply and exhaust facilities installed at the analysis site were investigated based on the actual testing, adjusting, and balancing test results to increase the reliability of the modeling results. The analysis indicated that the downdraft from the air-conditioning supply system prevented smoke from the fire source from spreading to the ceiling.