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Open AccessArticle

Three-Dimensional Heat Transfer Analysis of Metal Fasteners in Roofing Assemblies

Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, USA
Architecture & Facilities Engineering, Walt Disney World Resort, Orlando, FL 32830, USA
M.E. Rinker, Sr. School of Construction Management, University of Florida, Gainesville, FL 32611, USA
Building Technologies Program, Energy & Transportation Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
Authors to whom correspondence should be addressed.
Academic Editor: Cinzia Buratti
Buildings 2016, 6(4), 49;
Received: 6 October 2016 / Revised: 15 November 2016 / Accepted: 23 November 2016 / Published: 29 November 2016
(This article belongs to the Special Issue Building Refurbishment and Energy Performance)
Heat transfer analysis was performed on typical roofing assemblies using HEAT3, a three-dimensional heat transfer analysis software. The difference in heat transferred through the roofing assemblies considered is compared between two cases—without any steel fasteners and with steel fasteners. In the latter case, the metal roofing fasteners were arranged as per Factor Mutual Global (FMG) approvals, in the field, perimeter, and corner zones of the roof. The temperature conditions used for the analysis represented summer and winter conditions for three separate Climate Zones (CZ) namely Climate Zone 2 or CZ2 represented by Orlando, FL; CZ3 represented by Atlanta, GA; and CZ6 zone represented by St. Paul, MN. In all the climatic conditions, higher energy transfer was observed with increase in the number of metal fasteners attributed to high thermal conductivity of metals as compared to the insulation and other materials used in the roofing assembly. This difference in heat loss was also quantified in the form of percentage change in the overall or effective insulation of the roofing assembly for better understanding of the practical aspects. Besides, a comparison of 2D heat transfer analysis (using THERM software) and 3D analysis using HEAT3 is also discussed proving the relevance of 3D over 2D heat transfer analysis. View Full-Text
Keywords: roofing assemblies; steel fasteners; heat transfer; energy impact roofing assemblies; steel fasteners; heat transfer; energy impact
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Singh, M.; Gulati, R.; Srinivasan, R.S.; Bhandari, M. Three-Dimensional Heat Transfer Analysis of Metal Fasteners in Roofing Assemblies. Buildings 2016, 6, 49.

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