07-10-1996 Council Agenda - Laserfiche WebLink

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Kilmarnock, Va. 22482 -0247 May 3, 1982 TECHNICAL REPORT SUBJECT: Comparative Performance of Solar Films, Solar Screens, and Bare Glass. OBJECT: To Measure the Solar Energy Absorbed into Bare Glass and into Glass Shaded by Solar Films and Solar Screens. PROCEDURE: On Saturday, May I, 1982, sample panels of shading materials were applied to a set of four (4) aluminum - framed, 1 /8" clear double- strength awning window panes in the closed position, facing SW, for the purpose of measuring the temperatures on the inner surfaces of the glazing, at 3:00 PM. Solar films, both standard dark - tinted and metalized reflective polyester, were mounted on the inside surfaces as recommended, while solar screens were mounted externally at approximately I" clearance from the glass. Solar intensity at 3 :00 PM was measured at approximately 250 Btu /Hr. /ft.2 on a Model 776 dp Solar Meter. Interior surface temperatures were measured on Model SUR -15 Omega DialTemp Surface Thermometers. Adjacent sets of Awning Windows were fully opened to equalize indoor and outdoor temperatures at 78 °F. There was-no roof overhang or other protections above the test windows. Wind velocity at the time was 8 MPH for the SSE. OBSERVATIONS: All shading materials tested has equivalent shading effects . - - -- approximately 75% - -- From the sun's glare. Solar films reflected substantial amounts of the solar energy intercepted back into the glazing, where it was stored, requiring expenditure of air- conditioning energy to remove it. Special - patterned fiberglass solar screens, mounted externally, allowed a smaller heat buildup in the glass, since most of the solar radiation was rejected to the outdoors before reaching the glazing. Attached graphs Indicate the temoeratures measured, and the potential winter U- factors under Industry standard test sondltlons. HJHZhs Encl. Page 29 Respectfully submitted, c_SAvu/�(117 law Harvey J,: Famlet,P.E.