![]() ![]() Depending on the demand of the fire dynamic simulator, this tunnel will be divided into several small cells to operate and cumulate, with the diameter of the cells as 0.5 m³ per cell. The thickness of the ceiling and floor is 0.5m. Model F is designed as 120×20×5 (L×W×H) with the mechanical ventilation system. Among these six models, the function of model F shows prefect representation. Focusing on the mechanical ventilation in underground spaces, especially tunnels, six models is conducted to search for the relationship between the control of fire spread and the various parameters including ventilation volume, critical velocity, the concentration of toxic gases and the heat release rate. ![]() When increasing the height of the underground spaces, the storage capacity of the smoke will be larger than the underground spaces with a lower height. The smoke layer on the altitude depends mostly on the heat release rate of the fire source. ![]() Statistically, it has been found that the height of the underground space is one of the most important parameters for the underground spaces without mechanical ventilation. In this study, a six-tunnel mechanical ventilation system model is established by applying the fire dynamic simulator Pyrosim 2019. Based on the working experience in designing the metro stations, in this paper, the mechanical ventilation system is reorganized to reduce the length of smoke layering and the time of smoke chaos following the operation of the ventilation system in underground spaces. A suitable Mechanical ventilation system is selected to address the fire prevention and protection problem of the smoke and fire spread representation. In this paper, a simulation studies on the optimal ventilation system for the control of fire spread in underground space will be conducted, especially in tunnels. Over recent decades, a large number of cities of various countries have engaged in building metro lines, huge underground garages and tunnels, in order to enhance transportation capacity and address car-parking problems. Hong Kong Polytechnic University - Dissertationsĭepartment of Building Services Engineering Fire spread in underground spaces in the presence of mechanical ventilation ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |