Analysis on The Effectiveness of Detection and Alarm of Cable Corridor

Abstract

For analyzing the effectiveness of fire detection alarm system in the underground pipe gallery, different types of detection alarm system (space detection and object detection) is installed in the model of L type and T type cable corridor. By changing fire source position and the environment air velocity, the writer compares the fire temperature field and smoke concentretion under different working conditions to the influence of detection alarm system effectiveness. The results show that when the corridor space structure is T-shaped, the detection system is more likely to get fire signal and alarm. When the position of the fire source changes, the fire source energy at the corner of the L-shaped tunnel is first monitored by the cable-type linear temperature detector. In the L-type tunnel, when the wind speed increases, the time of point-type temperature detector and cable-type linear temperature detector increases, and the wind speed keeps increasing, the point-type temperature detector fails to alarm. In the T-type tunnel, the time of point-type smoke detector and cable-type linear temperature detector increases as the wind speed increases.