Wndows are account for the most of the heat gain in buildings, and to reduce the heat gain, exterior metallic shutters are commonly installed in residential buildings in hot climates. The shutter is typically partially opened to illuminate the indoor space, but potentially reduces the thermal effectiveness of the shutter. Since the temperature difference between the window glass and shutter is high, natural convection, flow in induced in the space between the window and shutter. Experimental measurements are employed to study the effect of the shatter on the heat gain through the window during the month of June. The results indicate that when the shutter is partially opened, the heat gain through window is increased significantly, depending on the shutter opening distance.
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