Equivalent wall method for dynamic characterisation of thermal bridges

Martín-Escudero, Koldobika; Escudero-Revilla, C.; Erkoreka, Aitor; Flores, I.; Sala, J.M.

doi:10.1016/j.enbuild.2012.08.024

Cited by 60 publications

(28 citation statements)

References 8 publications

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“…Linear thermal bridges can be implemented through the analysis of each thermogram corresponding to an object's surface temperature [16][17][18]. Bianchi [19] said that thermographic analysis allows for the identification of thermal bridges in buildings' envelope.…”

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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“…Martin [2] beschreibt zwei mögliche Wege, um Wärme-brücken in dynamischen Gebäudesimulationen zu berück-sichtigen: erstens die direkte Lösung der zwei-und dreidimensionalen Wärmeleitung und zweitens ein äquivalenter Bauteilaufbau, der sich gleich dem dynamischen thermischen Verhalten der Wärmebrücke der Konstruktion verhält. Für die direkte Implementierung sehen die Autoren weiteren Bedarf bei der Lösungsgeschwindigkeit und der Einfachheit der Problemspezifi kation in der Software.…”

Section: Coupling Of Dynamic Thermal Bridge and Hygrothermal Buildingunclassified

Kopplung von dynamischer Wärmebrückenberechnung mit hygrothermischer Gebäudesimulation

et al. 2013

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With increasing requirements on the thermal envelope of buildings dynamic building simulation is used more and more often for the design. Contrary to balance methods thermal bridges are often not accounted for in dynamic simulation. Especially the combination of a hygrothermal building simulation with the simulation of thermal bridges would allow assessing the dynamic influence of thermal bridges on the building energy demand, but also allow analyzing a possible risk for mould growth. This article presents the simulation methods for hygrothermal whole building simulation and thermal bridge simulation as well as their coupling. After validation of the thermal bridge module, which ensures a standard-conform implementation, an exemplary application case for the new simulation software is shown. Mould growth is sometimes found in the non-insulated and before damage free apartment, in cases where one of two side-by-side apartments is retrofitted with interior insulation. It is shown, how the temperature distribution in the exterior wall is changed due to the partial interior insulation measure. The influence of room temperature, moisture production, room ventilation and insulation thickness on the relative humidity on the coldest spot in the corner is analyzed. The partial retrofit causes higher and sometimes critical moisture conditions on the connection between exterior wall and party wall. In summary a hygrothermal whole building simulation software with coupled three dimensional dynamic thermal bridge simulation is presented. The thermal bridge module is successfully validated and the combined software applied to a practical case

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“…In recent years, condensation from air-conditioning systems and other devices has become prevalent in indoor environments, especially with the emergence of new air conditioning systems such as cold air distribution systems or radiant cooling systems, which cause condensation on the exposed cold surface of indoor terminals [16]. Condensation usually occurs at local wall areas in most rooms, e.g., a thermal bridge or a roof above vapor source [17]. There are mainly two ways of preventing condensation in ventilated rooms, which are improving thermal isolation of envelope and controlling indoor air humidity.…”

Section: Introductionmentioning

confidence: 99%

An algorithm to predict the transient moisture distribution for wall condensation under a steady flow field

Ma¹,

Li²,

Shao³

et al. 2013

Building and Environment

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Equivalent wall method for dynamic characterisation of thermal bridges

Cited by 60 publications

References 8 publications

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

Kopplung von dynamischer Wärmebrückenberechnung mit hygrothermischer Gebäudesimulation

An algorithm to predict the transient moisture distribution for wall condensation under a steady flow field

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