| Summary: | 碩士 === 國立中央大學 === 機械工程研究所 === 100 === The cooling of space depends on the configuration of the air conditioners. Considering the numbers of persons and their positions, we can change the mode of operation to reduce the energy consumption. In this study, the computational fluid dynamics (CFD) methods are used to analyze the influences of thermal comfort on the cooling target at different locations, such as, the location under inlet, the location between two inlets and the location on the center of four inlets by various working parameters, such as: the numbers of inlets at different velocities and temperature.
When the cooling target is under the inlet, results show that a single inlet is better to yield better thermal comfort and reduce energy cost. This is beacause that the increasing of the number of air inlet generates lots of turbulence in the flow field, which mix hot and cold air and therefore cause the deterioration of thermal comfort. The assessment of energy efficiency depends on the temperature and velocity in inlet, outlet, and the inside environment. When the cooling target is in the location bwtween two inlets, the best way for the target to maintain the same thermal comfort level but reduce the energy comsuption is to open one inlet with a certain angle. When the target is on the center of the four inlets, it is better to open two inlets with certain angles to yield better thermal comfort and reduce energy comsuption.
Comparing the influences of velocity and temperature on thermal comfort, by it is found that the temperature of the inlet has larger impact than the velocity of the inlet. Withing the thermal comfort region, reducing the inlet temperature will save the energy comsumption more than reducing the inlet velocity. For the purpose of reducing the energy comsuption, the best way is to feed air with low temperature and low velocity in the beginning, and then feed air with a higher temperature and velocity after the temperature reaching a certain value.
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