Abstract
The inlet and outlet size, number and location have a significant influence on the thermal environment indoor and air distribution for the temperature and velocity. In this work, numerical and experimental studies were performed to examine the influences of the inlet and outlet distribution, number and location, on the air movement and temperature distribution indoor. Also, the separation of the amount of the extracted air has been investigated in this study. To provide a comfortable environment for the occupants, important factors such as air temperature distribution, thermal sensation and draft rate should be evaluated carefully. Therefore, in this paper the occupant’s thermal sensation and the air movement and temperature distribution were used as the main evaluation index. In this investigation, three cases study were used tested. The experimental work was performed under the Iraqi weather conditions which are hot and dry in summer. The finding showed that the indoor thermal environments were significantly influenced by the opening locations of the exhaust. Also it was found that the satisfied human thermal comfort was obtained when the exhaust diffuser installed relatively far away from the supply diffuser. In addition, the best results were found by separate the amount of the exhaust air and extracted from the two exhausts opening. This will give the supplied air the ability to distribute inside room perfectly. Also, in order to prevent the air short circuit, the exhaust opening should not be located at the wall in front of the supply opening.
Highlights
The main important goal of the Heating, Ventilation, and Air Conditioning (HVAC) system is to provide a comfortable and healthy living environment and reduce the contaminant in the indoor room air
The systems of stratified air distribution (STRAD) have been attracted much attention by researches during the last two decades, which have an advantage in term of higher performance and ventilation efficiency comparing to the traditional mixing ventilation system (MV) [1]
The STRAD systems have an effective air distribution and higher thermal comfort comparing to the MV systems [1, 14,15]
Summary
The main important goal of the Heating, Ventilation, and Air Conditioning (HVAC) system is to provide a comfortable and healthy living environment and reduce the contaminant in the indoor room air. Lam et al [21] studied the temperatures distribution and air flow circulation inside the zone They numerically found that the position of exhaust has a significant impact on the human comfort of the STRAD system, in turn; it has a considerable impact on the annual load of cooling system. Kuo and Chung [25] examined numerically the influence of the air vent locations on the indoor human comfort using different ventilation methods Their results revealed that the best thermal comfort for the indoor air founded at the longer supply air throw in the working area. In this paper the influences of using a different number of the exhaust diffusers with different amount of the extracted air in an equipped office room on the human thermal comfort, velocity distribution, and indoor air temperature were investigated experimentally and numerically.
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