Effects of air inlet or outlet position of a fan coil unit ventilation system on smoke movement and fire severity

Effects of Time to Unactuate Air Conditioning on Fire Growth

“…Whether the fire growth is enhanced or suppressed depends on which factor plays the main role. To further understand fire growth in confined spaces affected by ventilation, many previous studies have investigated the heat release rate (HRR) of fire sources [18][19][20][21][22][23][24][25], the fuel mass loss rate [19,[26][27][28], the burning rate [13,17,29], the temperature [13,18,22,23,25,[28][29][30][31][32] and visibility [30,32] of the confined space, the thickness of the hot smoke layer [19,25,27,31], the heat fluxes on the floor [28] and the time to flashover (t fo ) [18,32]. A complete description of these studies can be found in Wang and Tsai [32].…”

“…The effects of both natural and mechanical ventilation on fire growth must be addressed. [22] 3 × 3.6 × 2.3M erci and Maele [23] 3 × 3.6 × 2.3Ľ assus et al [24] 2 × 2 × 2Ǧ omez et al [25] 32 × 17 × 8ˇŤ homas and Bennetts [26] 1.5 × 0.6 × 0.3P ierce and Moss [27] 1.8 × 1.2 × 1.2Ť ofilo et al [28] 1.2 × 0.8 × 0.8Ǩ umar and Naveen [29] 2.79 × 2.24 × 1.62Ȟ uang et al [30] 22.5 × 16 × 12Š u et al [31] 2.3 ×1.3 × 2.5ˇW ang and Tsai [32] 3.8 × 3.8 × 2.4ˇŠ u et al [31] utilized the Fire Dynamics Simulator (FDS) to analyze the position of air inlet and air exhaust in small vestibules of high-rise buildings. In their fire simulation scenario, the front door and rear door of the confined space were open, and the smoke exhaust and air supply rates were both 4.0 m 3 /s in the confined space.…”

“…Wang and Tsai [32] explored the effect of a change of ventilation position on fire growth under three rooms. The fire simulation scenario was that the door of the confined space was open, and the air supply rate was set as 0.5 m/s in the confined space.…”

“…The air outlet immediately exhausts the smoke; however, the air inlet takes some time to push the accumulated smoke to the air outlet and subsequently reduced the smoke layer thickness. Wang and Tsai [32] only considered the effect of air inlet/outlet positions on smoky air movement in a confined space with an opened door. Furthermore, the HRR was fixed in their scenario.…”

“…The distance from each air inlet/outlet to nearby wall was 0.6 m. Figure 2 shows the location of the air inlets and return air outlets on the ceiling. The arrangement of the inlet and outlet followed Wang and Tsai [32], who revealed that the best arrangement for fire safety is to install the air inlet near the door and the return air outlet far from the door on the ceiling. The two actions of the air inlet were set as "turn on an FCU", and "turn off an FCU".…”