Abstract
The glazed façade of a building is the part that produces the greatest energy losses and gains. The need to reduce energy consumption and CO2 emissions was one of the reasons that gave rise to dynamic windows.The ideal window would be one with optical properties that could readily adapt in response to changing climatic conditions or occupant preferences. The emerging concept of “dynamic window” is more as a multifunctional envelope that produces and manages energy rather than simply a static piece of coated glass. These facade systems include switchable windows and shading systems such as motorized shades, switchable electrochromic or gas chromic window coatings, Suspended Particle Device (SPD) Windows and double-envelope window-wall systems that have variable optical and thermal properties that can be changed in response to climate and building system requirements. Water flow glazing is a different concept of “dynamic window”. Water flow glazing provides control over the thermal load striking the surface, without compromising on transparency. The circulating water through the chamber both absorbs infrared radiation and reduces the temperature of the interior glass pane. Alongside, it provides thermal inertia to the window and a great potential to absorb and transport energy.
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