Case Study Shows Energy Saving Impact of Window Shades

Cooling costs can be cut by as much as 50% through the use of window shading systems, according to a case study conducted by an American shade manufacturer.

Cooling costs can be cut by as much as 50% through the use of window shading systems, according to a case study conducted by an American shade manufacturer.


Draper, Inc. studied energy efficiency by creating a computer model of the same building in 16 cities throughout the United States. The case study shows the proper selection and use of standard, single -color mesh shades reduced the amount of energy required for cooling up to 32 percent. The study shows the greatest savings come from the use of so -called duplex mesh fabrics -fabrics with a darker color on the inside and lighter on the outside. Using these fabrics saved as much as 75% in the study.

The key factors in the amount of savings are sun intensity, daylight hours and energy cost.

Study Criteria
-Fabric: 5% Basket Weave fabric is a charcoal color. 5% Duplex fabric is a charcoal/white color.
-Solar shading: The horizon is presumed to be at a vertical level of 5. No other obstacles or buildings are taken into account.
-Glazed surface in facade(s): 50% of the facade total surface.
-U -value of glazing: 2.9 W/mK (i.e. 0.15" (4 mm) glass).
-Ventilation: The Landscape Office is ventilated with external air through the whole year.
-The air change rate is a constant of 1 Volume/hour.
-Calculation period: One full year. Average of all four facades.
-Base orientation: Average of North, South, East and West facades.

For more information on the study, go to www.draperinc.com/moreinfo/windowshades/green.

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