الفهرس 
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Abstract
The present study is directed toward investigating experimentally the room air distribution behaviour, and the influence of the governing parameters on air flow pattern. Also I air diffusion system performance for a certain type of openings is evaluated. Moreover, conditioned air characteristics in the occupied zone are studied to have better insight into the effective parameters contributing in comfort condi tions. A central air conditioning plant has been designed and constructed in order to supply the required conditioned air to ~ a psychrometric test chamber through different ventilating openings. Only one opening is used for each experiment whereas others are tightly closed. All openings have the same aspect ratio (3:1), but at different locations from the ceiling. The ratio of supply opening width to room width is.