| Summary: | 碩士 === 國立臺北科技大學 === 能源與冷凍空調工程系碩士班 === 104 === Recently, the global warming effect is getting worse. People spend 90% life time in the indoors, and staying in the space with insufficient ventilation for a long time will affect their health. Therefore, the fan technology is applied to improve the effectiveness of the ventilation fan in the bathroom, strengthen ventilation performance and promote the air quality for their life.
In this thesis, the effects of the inlet nozzle diameter and axial clearance between the impeller on the performance of bathroom exhaust fan are examined in details. Besides, the geometric design of air intake is also examined. The parameters of the original fan were improved by the analysis of the experimental data of AMCA 210 standard. When the original axial gap used by manufacturer A was reduced to 3mm, the flow rate was increased by 3.1%. Iif the inlet nozzle diameter was reduced from 94mm to 84mm with fixed axial gas, the flow rate, static pressure and the total pressure efficiency were increased by 5.7%, 10.3% and 7.1%, respectively. If the flow rate is needed to be further increased independently, reducing the axial gap to 3mm would result in an increase of 8.9% flow rate. It is clear from the measure data that after changing the experimental parameters of the original fan, the fan efficiency can be improved and upgraded, contributing to energy saving and carbon reduction.
The measured results showed that the inlet diameter of the bathroom exhaust fan is the one of the parameters affecting the fan efficiency. The axial gap has less effect than the air inlet diameter does. In addition, the streamlined geometry at the inlet, compared with the original geometry, behaves a better fan performance. The author suggests that when changing the inlet diameter, the streamlined geometry can be adopted. Meanwhile, the noise measurement of the bathroom exhaust fan may be considered in the future study for the industrial reference.
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