The Study of Two-Layer Zone Model for Natural Air-Inlet Vent and Space with Mezzanine
|關鍵字:||火災模擬軟體;簡易二層法;補氣口;夾層;FDS(Fire dynamic simulator);Two-layer zone model;Air-inlet vent;Mezzanine|
If the fire load in a general small room, whose area 200m2, is large enough, then the evaluation of occupancy egress safety as a fire occurs by using the technical manual of building fire-evacuation performance evaluation is very hard to pass authority requirement. Therefore, this research team has been developed a simple two-zone model for smoke layer descending in a room fire. The model divides the room an upper hot layer from a lower cold layer. The mass and energy conservation equations are used to describe the smoke movement in the room fire. The input data include the area, height, partition wall materials and fire load. This predicted results by such model have been justified the corresponding ones obtained from the Fire Dynamics Simulator (FDS) and the technical manual mentioned previously. It also shows the fairly good agreements with the related measurements from the fire experiments. Those indicate that the simple two-zone model for smoke layer descending in a room fire can predict the fire behaviors very well in a suitable space. This study proposes to add air-inlet vent on this two-zone fire model.It considers the mass of smoke layer which exhaust through air-inlet vent into air to better meet the definition of mass conservation. It is also reduces the errors in the calculation of mass fluxes. In addition, the smoke movement in a room with a mezzanine is also taken into consideration in order to evaluate its hazardous degree if a fire occurs in this space. The corresponding simulations by using FDS are also carried out to justify the model.
|Appears in Collections:||Thesis|