Thermal Bridges in Insulation Systems

Petránek, Vít; Šubrt, Roman; Plachý, Jan; Nevřivová, Lenka; Petříček, Tomáš; Kalousek, Lubor; Caha, Zdeněk

doi:10.4028/www.scientific.net/amr.732-733.182

Cited by 6 publications

(4 citation statements)

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“…Nevertheless, it is an important factor in the design of high-energy performance buildings. It is especially important in the design of buildings with ventilated facade systems, where profiles of thermal insulation panels are fixed directly to the bearing layer of walls or brackets are used in order to reduce the influence of a thermal bridge on the properties of the thermal insulation layer [22]. Studies show that if solid metal profiles (which penetrate the thermal insulation layer) are used to fix thermal insulation, the thermal resistance might be cut in half [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 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.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2015

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“…The ways of insulation of building envelopes in the Czech Republic and the defects caused by thermal bridges have been dealt in detail e.g. in [3]. In the past this problem in older buildings was hardly ever solved, because in the context of the whole building envelope and the high values of heat transfer coefficient, these places did not represent a substantial problem, which is visible in the results presented in Table 1, when the linear heat transfer coefficient in the uninsulated variant composes only about 1.3% of all heat transfer in the assessed detail.…”

Section: Purpose Of Studymentioning

confidence: 99%

Analysis of Thermal Bridges in Loggias of Pre-Cast Concrete Apartment Buildings

2019

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The issue of complex regeneration of old pre-cast concrete apartment buildings is still a current task of everyday construction practice in the Czech Republic. When designing a new thermal insulation for the envelope of these buildings, we often encounter with critical assembly details. The correct solution of these details requires a detailed assessment in terms of the requirements of thermal protection of buildings. A correct assessment of these critical details is often very challenging and the ordinary designer is virtually unable to do it himself. This paper presents a practical and theoretical example of the design, solution and assessment of additional insulation of loggia loadbearing structures. Using the Ansys software platform, the critical details in 3D were designed and the influence of new thermal insulation on removal of the building defects was assessed. In conclusion, several proposals for possible rehabilitations and their expected efficiency were summarized.

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“…Development of anchoring elements with telescopes is combined with growing demands to reduce the impact of spot thermal bridges that arise due to anchoring. [2] Quality, quality and design of the telescope has a significant influence on the resistance and therefore the durability and longevity of flat roofs. Poorly made plastic telescopes are often the cause of the crash roofs.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the causes of defects due to quality roofing membranes mechanical anchoring

Stodůlka¹,

Bogárová²,

Matějka³

2016

MATEC Web Conf.

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Anchoring of the layers of flat warm roofs using anchoring elements is nowadays one of the most used technology. This is a frequent technology to repair damaged roofs (total reconstruction, increasing the load on the wind loads, partial repairs etc.). In the European building market there are several suppliers of the enchoring equipment who declare their product's properties in the european technical approvements (ETA). The goal of the article is to demonstrate results of the carried out measurements and their possible impact into practical application of the mechanically anchored systems. This allows reduce the amount of defects to improving flexible watertight membranes. The topic can be considered actual and due to the large number of defects precisely for these types of roofs.

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Thermal Bridges in Insulation Systems

Abstract: The article points out and describes in detail the basic thermal bridges in contact thermal insulation systems and in ventilated facades. Thermal bridges are illustrated by means of thermal images of spot thermal bridges and the calculation of spot heat transfer coefficients.

Cited by 6 publications

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

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

Analysis of Thermal Bridges in Loggias of Pre-Cast Concrete Apartment Buildings

Analysis of the causes of defects due to quality roofing membranes mechanical anchoring

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