Fire-induced thermal fields in window glass. I—theory

Joshi, AA; Pagni, Patrick J.

doi:10.1016/0379-7112(94)90050-7

Cited by 71 publications

(49 citation statements)

References 4 publications

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“…Shields et al heated the glass panes in an ISO room with a pool fire placed in the center and corner of the compartment [13,14]. Based on 59 tests, Joshi and Pagni [15,16] used a Weibull distribution to analyze the probability of glass breakage. Harada et al [17] conducted 50 radiant heating tests of float and wired glass with varying incident heat flux (3-9 kW/m 2 )…”

Section: Introductionmentioning

confidence: 99%

Investigation of thermal breakage and heat transfer in single, insulated and laminated glazing under fire conditions

Wang

Wen

et al. 2017

Applied Thermal Engineering

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(2017) Investigation of thermal breakage and heat transfer in single, insulated and laminated glazing under fire conditions. Applied Thermal Engineering, 125 . pp. 662-672. Permanent WRAP URL:http://wrap.warwick.ac.uk/92398 Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work by researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-for-profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP url' above for details on accessing the published version and note that access may require a subscription. glass. The thermal resistance from the air gap and fire side glass pane was found to play a key role for the ambient side pane of the insulated glazing. Although both panes of the laminated glazing broke, it could be held together by the layer of gel, effectively avoiding the formation of a new vent. Numerical simulations were performed to investigate the heat transfer process through the glazing panels and the temperatures in the glazing were predicted well. Suggestions for glass fire resistance design are proposed.

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Section: Introductionmentioning

confidence: 99%

Investigation of thermal breakage and heat transfer in single, insulated and laminated glazing under fire conditions

Wang

Wen

et al. 2017

Applied Thermal Engineering

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“…A theoretical value of ∆T=80 o C is reported for initial fracture and cracks [11]. Further theoretical studies were presented by Pagni and Joshi for a more accurate calculation of heat transferred and temperature field in the glass and the time of first crack occurrence [12,13]. To handle the non-linear radiation boundary conditions which contain terms with temperature to the power 4, a Laplace transform method is proposed to obtain the transient temperature field [12,13].…”

mentioning

confidence: 99%

“…Further theoretical studies were presented by Pagni and Joshi for a more accurate calculation of heat transferred and temperature field in the glass and the time of first crack occurrence [12,13]. To handle the non-linear radiation boundary conditions which contain terms with temperature to the power 4, a Laplace transform method is proposed to obtain the transient temperature field [12,13]. Sincaglia and Barnett [14] developed a glass fracture model with emphasis on radiation wavelength dependence which was implemented in the zone type computer code Branzfire by Parry et al [15].…”

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confidence: 99%

Thermal breakage of window glass in room fires conditions – Analysis of some important parameters

Dembele

Rosario

Wen

2012

Building and Environment

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In a compartment fire, the breakage and possible fallout of a window glass has a significant impact on the fire dynamics. The thermal breakage of glass depends on various parameters such as glass type, edge shading, edges conditions and constraints on the glass. The purpose of the present study is to investigate some of the key parameters affecting the thermal breakage of window glass in fire conditions using a recently developed and validated computer tool. Fallout is not within the scope of this study. Different boundary conditions of the glass pane (unconstrained and constrained) subjected to fire radiant heat are investigated. The analysis shows that to prevent glass thermal breakage, it is important to provide enough spacing between the frame and glass pane to accommodate the thermal expansion, and constraints on the glass structure should be avoided. The zones where the glass is likely to crack first are shown. The study also quantifies the effects of glass edge conditions on its thermal breakage in fire conditions; such analysis has not been reported in the literature due to its complexity and the statistical nature of edge flaws. The results show that an ordinary float glass mostly used in

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“…BREAK1 is based on the model developed by Pagni and Joshi [5], Joshi and Pagni [7] and uses numerical methods to solve an analytical physical description of the heat transfer to the glass. BREAK1 uses a single radiative decay length value (the inverse of the absorption coefficient) for the entire radiation spectrum.…”

Section: Break1 Comparisonmentioning

confidence: 99%

“…Joshi and Pagni [7,8] solve the heat transfer problem using a Laplace transform to produce integral equations that are then solved numerically using Newton-Raphson's method to find roots of the non-linear equations and the trapezoidal rule to approximate the integrals. This method requires evaluation of three integrals for each face of the windowpane at each time step.…”

Section: Introductionmentioning

confidence: 99%