Window Sun Shade Designs for House. Direct sun can produce the same heat over each square meter of a surface as a single bar radiator, but up to 90 percent of this heat can be blocked by effective shading. We can minimize summer temperatures, enhance comfort, and save energy by shading a building and its outdoor spaces. Depending on the orientation of the building as well as the environment and latitude, a number of shading strategies may aid, from fixed or customizable shades to trees and plants.
Window Sun Shades for House
Shading glass decreases heat gain that is unwanted. The easiest way to minimize excessive heat gain is by shading glass, as unprotected glass is often the biggest source of heat entering a home. However, poorly constructed fixed shading can block winter sun, while comprehensive summer shading can decrease incoming daylight, increasing artificial lighting use. The heat load on a building can also be minimized by shading uninsulated and dark-colored walls.
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Building elements and furnishings absorb radiant heat from the sun through the glass and then re-radiate it inside the dwelling. Re-radiated heat has a longer wavelength and does not as quickly pass through the glass back out. ‘Trapping’ radiant heat is ideal for winter heating in most climates but must be avoided in summer. Window Sun Shades for House.
In order to reduce summer heat gain, shading of wall and roof surfaces is therefore necessary, especially if they are dark or heavy. Up to 70% of the summer heat gain can be reflected by light-colored roofs.
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Using external shading facilities, such as wider eaves, window awnings, and deep verandas or pergolas, over openings. More heat is reflected by lighter shading devices, and those with light-colored undersides make better use of daylight than dark-colored ones. Unless it is reflective, internal shading does not stop heat gain: only shiny surfaces will reflect short wave radiation back through the glass without absorbing it.
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Use plants to shade the building, particularly windows, to reduce undesired glare and heat gain. For warm, humid and some hot, dry climates, evergreen plants are recommended. Using deciduous vines or trees in the north, and deciduous or evergreen trees in the east and west, for all other climates.
General Guidelines for all Climates
Sun can be removed in the summer and admitted in winter using simple horizontal devices, including eaves and awnings, within the range of north orientation that enables strong passive sun control (20 ° W and 30 ° E of solar north). It is still possible to find successful shading solutions for conditions where a good northern orientation can not be achieved (e.g. current building, difficult site) (see Orientation and Passive solar heating).
In summer, north-facing openings (and south-facing ones above the tropic of Capricorn) obtain greater sun angle and thus need narrower overhead shading devices than east or west-facing openings. All that is needed is fixed horizontal shading over north-facing glazing. Eaves, awnings, and pergolas with louvers set to the correct angle (see ‘Fixed shading’ below) are examples.
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East and west-facing openings need a different approach since it is more difficult to shade the low angle morning and afternoon summer sun from these directions. Keep the glazing area to a minimum where possible in the east and west orientations, still allowing for good cross-ventilation (see Passive cooling) or using suitable shading devices. The optimum solution for these elevations is adjustable shading, such as external blinds.
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Window Sun Shade Designs for House