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Abstract
‘Supply Air’ windows work as a heat reclaim device by intercepting a substantial proportion of incident solar energy as well as entraining beat escaping from rooms. This series of experiments was to determine if laminar flow could be achieved with a constant gap width across the range of window sizes commonly manufactured for domestic use. Ue-values were calculated from whole test cell energy balances during the day (the windows being un-shaded) and at night time the pressure-controlled vents were also tested for their effectiveness at regulating airflow through the window. Two windows of different aspect ratios were tests. Both achieved very low Ue-values with statistical upper limits of 0.6 and 0.5 W/m2K.