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

Jolanta Šadauskienė, Juozas Ramanauskas, Lina Šeduikytė, Mindaugas Daukšys and Algimantas Vasylius
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Jolanta Šadauskienė: Faculty of Civil Engineering and Architecture, Kaunas University of Technology, Studentų st. 48, Kaunas LT-51367, Lithuania
Juozas Ramanauskas: Faculty of Civil Engineering and Architecture, Kaunas University of Technology, Studentų st. 48, Kaunas LT-51367, Lithuania
Lina Šeduikytė: Faculty of Civil Engineering and Architecture, Kaunas University of Technology, Studentų st. 48, Kaunas LT-51367, Lithuania
Mindaugas Daukšys: Faculty of Civil Engineering and Architecture, Kaunas University of Technology, Studentų st. 48, Kaunas LT-51367, Lithuania
Algimantas Vasylius: Faculty of Civil Engineering and Architecture, Kaunas University of Technology, Studentų st. 48, Kaunas LT-51367, Lithuania

Sustainability, 2015, vol. 7, issue 12, 1-16

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 ? -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 ? -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.

Keywords: passive house; thermal bridge; point thermal transmittance; sustainable building; ventilated facade systems (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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