On the bidirectional flow across an atrium ceiling vent

Chow, Wan Ki; Li, J.

doi:10.1016/j.buildenv.2011.06.018

Cited by 21 publications

(8 citation statements)

References 10 publications

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“…It has been observed that the flow pattern through horizontal vents for compartment fire scenarios is complex (Chen 2011) and hard to obtain by several velocity sensors. Cooper (1995) developed an algorithm to calculate the flow across horizontal ceiling vents, which has been systematically summarised in Chow and Li (2011).…”

Section: Ceiling Vented Compartment Firementioning

confidence: 99%

“…The heat loss through the wall and the opening could be determined by empirical models, while those models could also be validated and may be modified when being used. For instance, Cooper (1995) developed an algorithm to calculate the flow across horizontal ceiling vent, which is the most acceptable method in calculating vent flow of horizontal openings and has been applied by several scientists in atrium fires (Li et al 2002;Chow and Li 2011). While the applicability of the algorithm in obtaining the vent flow for fires at different locations is still unclear, especially for fires positioned directly under the vent which would lead to strong buoyancy driven by the fire plume.…”

Section: Introductionmentioning

confidence: 98%

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Performance of overall heat transfer coefficient and exploring heat transfer through the ceiling vent of compartment fire in ship structures with A60 constructions

Zhang

et al. 2014

Ships and Offshore Structures

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Exploratory investigations on overall heat transfer coefficient of compartment fires in ship structures with A60 constructions were conducted, as well as heat transfer through ceiling vented compartments in such constructions. The results indicated that the overall heat transfer coefficient decreased with the burning process, as well as the cooling process after the extinction. From the view of temperature difference, the overall heat transfer coefficient decreased exponentially with the rising temperature difference for "temperature rise" stage, and increased linearly with the increase of the temperature difference for "temperature drop" stage. For the tested cabin, the average overall heat transfer coefficient was in proportion to one-third power of the heat release rate. In addition, care should be taken in applying Cooper algorithm to calculate the mass flow out of the ceiling vented compartment for fires directly beneath the ceiling vent, under which the plume-induced flow may be the dominant factor under such circumstance. Finally, a potential method was suggested to deal with the ceiling vent flow for fires positioned directly under the ceiling vent.

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Section: Ceiling Vented Compartment Firementioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Performance of overall heat transfer coefficient and exploring heat transfer through the ceiling vent of compartment fire in ship structures with A60 constructions

Zhang

et al. 2014

Ships and Offshore Structures

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“…In recent years, more attention on the study (Fan et al 2013;Chow and Li 2011;Chow and Gao 2009) of tunnel fire is the smoke spread under the natural ventilation. Chen et al (2015) reveals the effect of the distance between ceiling extraction (opening) distance and heat source on the thermally-driven smoke back-layering flow length beneath the ceiling in a tunnel with combination of ceiling extraction and longitudinal ventilation.…”

Section: ．Introductionmentioning

confidence: 99%

Maximum Smoke Temperature in Non-Smoke Model Evacuation Region for Semi-Transverse Tunnel Fire

Lou

Qiu

Long

2017

JAFM

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Smoke temperature distribution in non-smoke evacuation under different mechanical smoke exhaust rates of semi-transverse tunnel fire were studied by FDS numerical simulation in this paper. The effect of fire heat release rate (10MW 20MW and 30MW) and exhaust rate (from 0 to 160m 3 /s) on the maximum smoke temperature in non-smoke evacuation region was discussed. Results show that the maximum smoke temperature in non-smoke evacuation region decreased with smoke exhaust rate. Plug-holing was observed below the smoke vent when smoke exhaust rate increased to a certain value. Smoke spreading distance can be divided into three stages according to changes of smoke exhaust rate. The maximum smoke temperature model concluded that the peak temperature rise at tunnel vault is proportional to 0.75 power of dimensionless fire power. The maximum temperature in non-smoke evacuation region decays exponentially with the increase of smoke exhaust rate. However smoke vent interval influences the dimensionless maximum temperature in nonsmoke evacuation region slightly. Smoke vent interval influences the dimensionless maximum temperature in non-smoke evacuation region slightly.

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“…Ji et al [8] numerically investigated the buoyancy-driven natural ventilation flows in a single-storey space connected to an atrium. Chow and Li [9] discussed the bidirectional flow across a ceiling vent in an atrium on the smoke layer interface height for the purpose of fire defects in a typical atrium. Wang et al [10] recommended using smoke screen and mechanical exhaust facilities to achieve virtual fire district.…”

Section: Introductionmentioning

confidence: 99%

Effects of outdoor temperature on the natural smoke extraction strategy in an atrium

Zhen

Ran

2015

Proceedings of the 2015 International Industrial Informatics and Computer Engineering Conference

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Natural smoke extraction strategy in an atrium connecting a subway station and commercial building is numerically studied in this article. Different outdoor temperatures ranged from-10°C to 35°C during the fire-induced smoke development in the atrium are studied in detail. The t-square fire curve is assumed and the time averaged from 300s to 350s is adopted for quantitative comparisons of visibility and temperature profiles after HRR reaches the maximum 4MW. It is shown from the simulation results that the natural smoke extraction scheme is effective in the range of outdoor temperature from 35°C to 25°C. When the outdoor temperature decreases to 20°C, the effect of natural smoke extraction is less significant. After further decreasing to 10°C or lower, the natural smoke extraction scheme does not work anymore.

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On the bidirectional flow across an atrium ceiling vent

Cited by 21 publications

References 10 publications

Performance of overall heat transfer coefficient and exploring heat transfer through the ceiling vent of compartment fire in ship structures with A60 constructions

Performance of overall heat transfer coefficient and exploring heat transfer through the ceiling vent of compartment fire in ship structures with A60 constructions

Maximum Smoke Temperature in Non-Smoke Model Evacuation Region for Semi-Transverse Tunnel Fire

Effects of outdoor temperature on the natural smoke extraction strategy in an atrium

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