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Sustainability 2015, 7(12), 16687-16702; doi:10.3390/su71215840

A Simplified Methodology for Evaluating the Impact of Point Thermal Bridges on the High-Energy Performance of a Passive House

1
Faculty of Civil Engineering and Architecture, Kaunas University of Technology, Studentų st. 48, Kaunas LT-51367, Lithuania
2
Institute of Architecture and Construction of Kaunas University of Technology, Tunelio st. 60, Kaunas LT-44405, Lithuania
*
Author to whom correspondence should be addressed.
Academic Editor: Adrian Pitts
Received: 9 November 2015 / Revised: 10 December 2015 / Accepted: 14 December 2015 / Published: 17 December 2015
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Abstract

In the design of high-energy performance buildings with ventilated facade systems, the evaluation of point thermal bridges is complicated and is often ignored in practice. This paper analyzes the relationship between the point thermal bridges resulting from aluminum fasteners, which are used for installation facades cladding, and the thermal properties of materials that are used in external walls layers and dimension of layers. Research has shown that the influence of the point thermal bridges on the U-value of the entire wall may achieve an average of up to 30% regarding thermal properties of materials of the external wall layers and the dimension of layers. With the increase in thermal conductivity of the bearing layer material and the thickness of the thermal insulation layer, the point thermal transmittance χ-value increased. For this reason, the U-value of the entire wall may increase by up to 35%. With the increase of the thickness of the bearing layer and thermal conductivity value of thermal insulation layer, the point thermal transmittance χ-value decreased by up to 28%. A simplified methodology is presented for the evaluation of point thermal bridges based on the thermal and geometrical properties of external wall layers. View Full-Text
Keywords: passive house; thermal bridge; point thermal transmittance; sustainable building; ventilated facade systems passive house; thermal bridge; point thermal transmittance; sustainable building; ventilated facade systems
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Šadauskienė, J.; Ramanauskas, J.; Šeduikytė, L.; Daukšys, M.; Vasylius, A. A Simplified Methodology for Evaluating the Impact of Point Thermal Bridges on the High-Energy Performance of a Passive House. Sustainability 2015, 7, 16687-16702.

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