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.
Highlights
The indoor air quality and thermal comfortable are the most necessary condition for the inside environment
High indoor air quality can be obtain with using HVAC systems that supply enough quantity of fresh air to the occupied zone whilst effectively elimination contaminants
The component of Displacement Ventilation AUST (DV) is shown in figure 4 consist of air washer box that sides are closed by aluminum plates and all side of the box are insulated by cork having thermal conductivity of 0.04W/m
Summary
The indoor air quality and thermal comfortable are the most necessary condition for the inside environment. Because people remain more time inside environmental, heating, ventilation and air condition (HVAC) systems supply high indoor air quality and thermal comfortable became very important. High indoor air quality can be obtain with using HVAC systems that supply enough quantity of fresh air to the occupied zone whilst effectively elimination contaminants. HVAC, systems provide suitable air temperature by elimination heat from occupied zone while avoid large air temperature gradients and drafts. Economic side should be achieved by both thermal and indoor air quality requirements, because the largest energy consumption is done by these systems. According to recent researches more than 40% of total energy used by commercial building is consumption by HAVC systems [1]
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