Study on the Effects of Activation Time on Window Glass Protection with Water Mist Curtain under a Fire Scenario
The protection effect of water mist curtain (WMC) on the float glass is alterative with the different time to act WMC.Improper activation of the sprinkler or the cold water sprayed from the fire-fighting lance may accelerate the crack even fallout of the heated glass when encounter a fire.Twenty five tests were conducted to investigate the optimum time to act WMC in this study.The effect of activation time on 6 mm float glass protection with WMC had been studied.The results illustrate that the cracking of the float glass is not accelerated when the temperature of the glass surface outnumbered to that of acting WMC system.Delaying acting WMC has no influence on fire protection of the window glass pane.The optimum time to act WMC is the time that when the maximum temperature of the glass pane is priors to critical breaking temperature.It is also found that delaying acting the water film may not accelerate the crack but the protecting efficiency of WMC becomes poorer.Its initial breakage time decreases from 600 s to 525 s when acting the water film at the maximum temperature of the glass pane of 90 ℃ (145 s after ignition).Therefore, it is optimum to act the water film at the beginning of the fire.
water mist curtain water film acting time window glass protection float glass
TAN Qiong WANG Xishi WANG Zhigang
State Key Lab.of Fire Science, University of Science & Technology of China, Anhui Province, Hefei 23 State Key Lab.of Fire Science, University of Science & Technology of China, Anhui Province, Hefei 23
国际会议
The 2016 International Symposium on Safety Science and Technology(2016安全科学与技术国际会议)
昆明
英文
366-372
2016-10-17（万方平台首次上网日期，不代表论文的发表时间）