| Summary: | 碩士 === 國立臺北科技大學 === 冷凍空調工程系所 === 94 === Because of the advantage of good outlook, low noise, compact size and reasonable price, the split-type air-conditioner has become the mainstream in the market of small-sized air-conditioners. In order to improve the performance and reduce the noise of the split-type air-conditioner, this study adopts the CFD software FLUENT V. 6.1 to perform the airflow simulation for both indoor and outdoor units. The analysis of the indoor unit focuses on the impact of the clearance of the rear wall and the structure of the extended wall of the tongue on the fan performance and noise generation. The simulation results reveal that the gap between the rear wall and the rotor is equal to 5.5 mm, resulting in the lowest value of blade frequency tone. However, changing the structure on the extended wall of the tongue is not helpful to improve fan performance and reduce noise. In the simulation of the outdoor unit, the effects of the position of propeller fan and the structure of bell MOUTH on the volume flow rate are our main concerns. According to the CFD simulation, it is known that suitable position of propeller fan can generate the largest volume flow rate and the structure of bell MOUTH has very tiny influence on the volume flow rate. Moreover, to investigate the installed position of the outdoor unit on the performance of the air-conditioner, velocity and temperature fields around the outdoor unit placing at different location are simulated in this study. To compare the simulation results with the experimental data available in the literature, it is found that the largest relative error between both results is less than 6%. Therefore, the results show that using the CFD method to study the optimal installed position of the outdoor unit is reliable. Also, it is a very cost-effective tool.
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