洁净空调系统对初期火灾探测的影响分析

Analysis on the Effects of Air-conditioning System on the Early-stage Fire Detection in a Clean Room

运用FDS(Fire Dynamic Simulator)软件对采用上送下回式空调系统的洁净室火灾烟气运动进行了数值模拟.通过对速度场及温度场的分析,研究了上送下回式气流组织模式对烟气运动和早期火灾烟气探测的影响.模拟研究结果表明,天花板附近的温度场和浓度场均受到较大影响,与没有洁净空调作用情况下相比,火灾探测响应时间将延迟数十秒.

Smoke movement is numerically simulated using FDS（Fire Dynamic Simulator） developed by NIST in a clean room with an upper-supply and bottom-exhaust air-conditioning system.The velocity field and temperature distribution in the early stage of a fire is analyzed.The effect of the air flow pattern on smoke movement as well as the effect on early stage fire detection are discussed.The temperature and concentrations near the ceiling are affected significantly and the detector activation time will be delayed for dozens of seconds compared with that of the room without air-conditioning systems.