TY - JOUR
T1 - Evaluation of alternatives for reducing thermal bridges in metal panel curtain wall systems
AU - Song, Jin Hee
AU - Lim, Jae Han
AU - Song, Seung Yeong
N1 - Funding Information:
This research was supported by a grant (16RERP-B082204-03) from the Residential Environment Research Program funded by the Ministry of Land, Infrastructure and Transport of the Korean Government . This research was also supported by a KETEP grant (No. 20132010101910 ) funded by the Korean Government .
Publisher Copyright:
© 2016 Elsevier B.V. All rights reserved.
PY - 2016/9/1
Y1 - 2016/9/1
N2 - Building envelopes incorporate thermal bridges, through which heat is transferred in either two or three dimensions. These thermal bridges lead to undesirable heat transfer, thereby resulting in an overall reduction in the insulation performance. In this study, alternatives were proposed to reduce the linear and point thermal bridges found in steel truss metal panel curtain wall systems in which metal panels fabricated by covering six faces of insulation with metal are fixed to the truss. Three-dimensional heat transfer simulations and mock-up tests were conducted to evaluate the insulation performance of the alternatives. Also, life-cycle costs were analyzed to evaluate the economic feasibility of the selected alternative. The evaluation results showed that the alternative 2, in which the lengths of the aluminum molding at the sides of the metal panel were reduced and for which thermally broken brackets were used, was the most effective alternative. The mock-up test performed in winter showed that the alternative 2 largely reduced the heat loss through the thermal bridges and had better insulation performance. Assuming a lifetime of 40 years, the alternative 2 would reduce the life cycle costs by 10.9% relative to the existing case.
AB - Building envelopes incorporate thermal bridges, through which heat is transferred in either two or three dimensions. These thermal bridges lead to undesirable heat transfer, thereby resulting in an overall reduction in the insulation performance. In this study, alternatives were proposed to reduce the linear and point thermal bridges found in steel truss metal panel curtain wall systems in which metal panels fabricated by covering six faces of insulation with metal are fixed to the truss. Three-dimensional heat transfer simulations and mock-up tests were conducted to evaluate the insulation performance of the alternatives. Also, life-cycle costs were analyzed to evaluate the economic feasibility of the selected alternative. The evaluation results showed that the alternative 2, in which the lengths of the aluminum molding at the sides of the metal panel were reduced and for which thermally broken brackets were used, was the most effective alternative. The mock-up test performed in winter showed that the alternative 2 largely reduced the heat loss through the thermal bridges and had better insulation performance. Assuming a lifetime of 40 years, the alternative 2 would reduce the life cycle costs by 10.9% relative to the existing case.
KW - Economic feasibility
KW - Insulation performance
KW - Steel truss metal panel curtain wall
KW - Thermal bridge
UR - http://www.scopus.com/inward/record.url?scp=84973277737&partnerID=8YFLogxK
U2 - 10.1016/j.enbuild.2016.05.078
DO - 10.1016/j.enbuild.2016.05.078
M3 - Article
AN - SCOPUS:84973277737
SN - 0378-7788
VL - 127
SP - 138
EP - 158
JO - Energy and Buildings
JF - Energy and Buildings
ER -