Design, Development, and Testing of an Automated Window Shade Controller

[+] Author and Article Information
G. R. Luecke, J. Slaughter

Department of Mechanical Engineering, Iowa State University, Ames, IA 50010

J. Sol. Energy Eng 117(4), 326-332 (Nov 01, 1995) (7 pages) doi:10.1115/1.2847872 History: Received August 01, 1994; Revised September 01, 1995; Online February 14, 2008


An approach to the design of active window shades is developed to control the direct solar gain through a window. Using simple actuation hardware and sensors, a control strategy is presented that automatically adjusts window shades to save HVAC energy by controlling direct solar radiation passing through a window. The control algorithm is based on a simple approach that admits direct light in the winter and blocks the direct light in the summer, while providing shade adjustment that affords maximum visibility through the window. Cloudy skies or indirect sun result in horizontal placement of the shades, and the shades close at night. The implementation uses two thinfilm photovoltaic cells as sensors and a control algorithm that is independent of the window orientation, latitude, or solar time, so that it operates properly in any installation location. Preliminary analytic and test results show significant energy savings when the automatic window shades are compared with a window without shades, and with a window outfitted with fixed horizontal shades.

Copyright © 1995 by The American Society of Mechanical Engineers
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