Abstract
Abstract The gradual exploitation of the natural environment has forced most developed countries to promote ecological solutions and the development of sustainable construction. Ventilated facades perfectly match into this trend, and with their appropriate design, they bring real energy savings. This paper analyzes numerically the influence of the inflowing air, mimicking the wind, on the efficiency of heat removal from the ventilated space and heat transmission by thermal radiation and conduction through the consecutive layers of the external wall. For the purpose of comparison, two variants of ventilated facade were adopted: open and closed joints, at different wind speeds prevailing outside. The results obtained show that in windless weather, the ventilated facade with open joints shows higher heat removal efficiency and thus lower heat transmission to the building interior. At higher wind speeds of 5 m/s, the open-joint and closed-joint ventilated facades achieve similar heat transfer efficiency, and the prevailing temperature inside the building for the two technologies is almost identical. Subsequent increments of incoming wind on the building result in minimal differences in the heat transmission to the building interior, representing changes of about 0.1°C at increments of another 5 m/s of incoming wind. Conscious use of this facade technology, along with appropriate urban design of cities, can help reduce the energy needed to cool buildings during the summer period.
Highlights
Gradual exploitation of the natural environment has forced most developed countries to promote ecological solutions, including lower energy consumption and promotion of renewable energy sources
In order to verify the scientific issue, measurement points were located in two technological variants of the ventilated facade: closed and open joints
It can be observed that for both closed and open joints, the wind speed prevailing outside affects the efficiency of heat removal from the ventilation space, and in turn affects the lower temperatures inside the room
Summary
Gradual exploitation of the natural environment has forced most developed countries to promote ecological solutions, including lower energy consumption and promotion of renewable energy sources. A ventilated facade ensures that the effect of heat transfer from the environment, especially on summer and sunny days, to the building interior is reduced. This is caused by limited thermal conduction. Thermal conduction, i.e., heat transfer through solids in the case of an ETICS facade, takes place through the entire surface, while in the case of a ventilated facade, it takes place only through consoles, which mediate between the external facade cladding and the external wall
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