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Open AccessArticle

Experimental Study of Thermal Behavior of Insulation Material Rigid Polyurethane in Parallel, Symmetric, and Adjacent Building Façade Constructions

1
College of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230022, China
2
College of Mechanical Engineering and Automation, Huaqiao University, Xiamen 361021, China
3
State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China
*
Authors to whom correspondence should be addressed.
Polymers 2018, 10(10), 1104; https://doi.org/10.3390/polym10101104
Received: 5 September 2018 / Revised: 30 September 2018 / Accepted: 3 October 2018 / Published: 6 October 2018
(This article belongs to the Special Issue Polymeric Foams)
Both experimental and theoretical methods were proposed to assess the effects of adjacent, parallel, and symmetric exterior wall structures on the combustion and flame spreading characteristics of rigid polyurethane (PUR) foam insulation. During the combustion of PUR specimens, the flame leading edge was found to transfer from a unique inverted ‘W’ shape to an inverted ‘V’ during flame propagation. This phenomenon is attributed to edge effects related to boundary layer theory. The effects of the adjacent façade angle on flame spreading rate and flame height were shown to be nonlinear, as a result of the combined influences of heat transfer, radiation angle, and the chimney restriction effects. A critical angle around 90 degree with maximum thermal hazards outwards by parallel fire was observed and consistent with the mass loss rate and flame height tendencies. For narrow spacing configurations or angles (e.g., 60 and 90 degrees), phenomenological two-pass processing in conjunction showed that increased preheating lengths were associated with enhanced heat transfer. The results of this study have implications concerning the design of safe façade structures for high-rise buildings, and provide a better understanding of downward flame spreading over PUR. View Full-Text
Keywords: adjacent façade; PUR; energy conservation; heat transfer; burning characteristic adjacent façade; PUR; energy conservation; heat transfer; burning characteristic
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MDPI and ACS Style

Ma, X.; Tu, R.; Cheng, X.; Zhu, S.; Ma, J.; Fang, T. Experimental Study of Thermal Behavior of Insulation Material Rigid Polyurethane in Parallel, Symmetric, and Adjacent Building Façade Constructions. Polymers 2018, 10, 1104.

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