Theoretical and Experimental Study of Combined System: Chilled Ceiling and Displacement Ventilation

Abstract

The present experimental study presents the of performance of the combine cooling system (chilled ceiling and displacement ventilation). The experimental study included the effect of different temperatures of chilled ceiling of (20 and 16)℃ and different supplied air temperatures of (18, 20, 22 and 24)℃ with constant internal load of 1600W and constant supplied air velocity of 0.75m/s. The theoretical study content studying the air flow pattern through occupant zone and temperatures contours in different directions X, Y and Z at supplied air temperature (18)℃ and internal load, mean plate temperature and supplied air velocity of (1600W, 20℃ and 0.75m/s) respectively. The experimental results show that the cooling capacity of air decreases as temperature of supplied air increases. At temperature of supplied air increase by 33.3%, the cooling capacity of air decreases by (22.7 and 22.54)% for chilled ceiling temperature of (20 and 16)℃ respectively. While cooling capacity of chilled ceiling increases as supplied air temperature increases. At supplied air increases by 33.3%, the cooling capacity of chilled ceiling increase by (14 and 15.28)% for chilled ceiling temperatures of (20 and 16)℃ respectively. The theoretical results show that the air velocity and temperatures contours for supplied air temperature in different direction are approximated constant.