TY - JOUR
T1 - Three-dimensional heat transfer analysis of metal fasteners in roofing assemblies
AU - Singh, Manan
AU - Gulati, Rupesh
AU - Srinivasan, Ravi S.
AU - Bhandari, Mahabir
N1 - Publisher Copyright:
© 2016 by the authors.
PY - 2016
Y1 - 2016
N2 - 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.
AB - 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.
KW - Energy impact
KW - Heat transfer
KW - Roofing assemblies
KW - Steel fasteners
UR - http://www.scopus.com/inward/record.url?scp=85007502612&partnerID=8YFLogxK
U2 - 10.3390/buildings6040049
DO - 10.3390/buildings6040049
M3 - Article
AN - SCOPUS:85007502612
SN - 2075-5309
VL - 6
JO - Buildings
JF - Buildings
IS - 4
M1 - 49
ER -