Abstract
Abstract The article deals with the issue of double skin transparent facades as a new technological-operational system of transparent exterior walls. Especially of high-rise buildings, which with its operating modes ingeniously uses a renewable source of solar energy to reduce the energy needs of the building. The basic precondition for the correct function of the double skin facade is its functional aerodynamics in any climatic conditions of the outdoor climate. In the critical state of windlessness, the aerodynamic quantification of a double skin facade is the total aerodynamic resistance of the cavity, which consists of the aerodynamic frictional resistances along the length of the air flow line and local aerodynamic resistances of the cavity. The article analyses the functional aerodynamics on two frequented types of double skin facades with a narrow type and corridor type cavity. At the end it confronts functional aerodynamics with the results of their temperature, aerodynamic and energy regime obtained from in-situ experiments.
Highlights
At the end of the 20th century, double skinned transparent facades began to be applied in the facade technology of buildings in the developed countries of the world
The theory of cavities results in a double skin facade in the quantification of the physical regime of its cavity. It is a matter of knowing the aerodynamic, temperature and energy regime in time, while it should be noted that there are strong bonds between them expressed by the laws of physics
Functioning double skin transparent facade has to be able to eliminate the thermal load from shortwave solar radiation through its transformation into long-wave thermal radiation in the physical cavity
Summary
At the end of the 20th century, double skinned transparent facades began to be applied in the facade technology of buildings in the developed countries of the world. The functional aerodynamics of the double skin facades (DSF) comes from their correct geometryconstruction design (width and effective height of the cavity, geometry of the inlet and outlet openings including the rain louvers and protective screen against birds and insects, type and position of the sun protection device at the cavity and glazing properties), ventilation mode, building orientation, structure and façade design [5]. The results showed that the shading device can effectively reduce the total solar energy transmission to the building in summer period even with slightly opened blinds, for both cases simple and double skin facade. In order to determine the degree of accuracy of the algorithm, a double facade has been monitored under controlled conditions and the results have been compared with the predicted values for several design situations
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