engleski

Numerical model of point thermal bridges

As part of a thermal assessment of the building envelope, heat losses due to penetrations or similar local effects have to be calculated and where necessary minimized, so that the thermal efficiency of the building envelope is within acceptable limits. There are two types of thermal bridges: linear and point (singular) thermal bridges. Usually they can be identified using thermal imaging cameras. Some thermal bridges can be characterized as singular or point thermal bridges. They only occur in one spot. Typical examples include steel balconies, canopies, roof extensions, fastening elements, such as dowels or curtain wall supports and anchor bolts that penetrate the insulating layer. This study investigates the effects of thermal bridges caused by steel rods in prefabricated elements and their minimisation. To show the efficiency of the model temperature was measured over time (since May 2016) on internal and external side of the wall and in 6 other places inside the cross section of the wall. During construction probes were put inside each layer for temperature measurement. Internal and external temperature are used as boundary conditions, and other 6 measuring places are used for comparison and to determine efficiency of the panel. Panel is made out of 4 layers, facade concrete element made with recycled brick aggregates (6 cm), ventilated air layer (4 cm), mineral wool (20 cm) and load bearing concrete element made with recycled aggregates (12 cm). Facade concrete element is supported by steel rods that go through thermal insulation and into load bearing concrete element.

Thermal bridges, numerical model, FEM model

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