Abstract

In some countries, test standards have been adopted which measure the effectiveness of smoke exhaust systems in clearing out heat and smoke produced separately. However, because these standards provide no quantitative provisions for dealing with the amount of visual smoke, there is an unclear correlation between the amount of smoke generated and the fire load. This paper applied the homogeneity concept of using a smoke collection box to examine the smoke generation rate of a smoke generator using CO2 as the driving gas. To avoid using the previous visual method of judging the rates, this research used measurement equipment to conduct a scientific analysis. Thus, the results were more objective. The equipment used included a Closed-Circuit Television (CCTV) Camera, a thermocouple, a traditional P-type smoke detector, a digital R-type smoke detector, and light attenuation measurement equipment. Under release pressures of 40, 60 and 80 psi, a 15% smoke density required smoke generation at 6.50, 8.42 and 10.46 m³/s, respectively. Achieving a homogeneous distribution of smoke within the space was accomplished. The data obtained in the test could be used not only to judge the efficiency of a smoke exhaust system but also provide adjustment information for a smoke exhaust system.

摘要

在一些国家，已采用测试标准来衡量排烟系统在清除单独产生的热量和烟雾方面的有效性。然而，由于这些标准没有提供处理视觉烟雾量的定量规定，因此产生的烟雾量与火灾负荷之间的相关性不明确。本文运用烟气收集箱的均质性概念，考察了以 CO2 为驱动气体的烟气发生器的烟气生成率。为了避免使用以往的视觉判断费率的方法，本研究使用测量设备进行科学分析。因此，结果更加客观。使用的设备包括闭路电视 (CCTV) 摄像机、热电偶、传统 P 型烟雾探测器、数字 R 型烟雾探测器、和光衰减测量设备。在 40、60 和 80 psi 的释放压力下，15​​% 的烟雾密度需要在 6.50、8.42 和 10.46 m 处产生烟雾³ / s，分别。实现了空间内烟雾的均匀分布。测试得到的数据不仅可以用来判断排烟系统的效率，还可以为排烟系统提供调整信息。