現今由於能源議題浮現,節能減碳變成產品開發製造時所需考量之重要因素,而工業用離心風機大量使用且長時的運作,若可以有效改善風機之效率將可大幅減少碳排放及用電成本;另外,由於中國大陸對於可販售風機訂定風機效率之門檻,未達門檻則無法販售,因此本研究以協助台商風機廠通過大陸之效率門檻為主要目標。 本研究考慮製造過程中之公差干擾因素,利用CFD軟體,配合田口方法來改善現有後傾式離心風機之設計,以提升風機之效率,除了改良喇叭口之幾何外型及機殼高度使空氣流動可以更加順暢外,也利用田口方法將風輪葉片之入口角b1、出口角b2、入口葉片高度b1以及出口高度b2作為內直交表的因子,另外將入口角b1之公差、出口高度b2之公差以及喇叭口跟葉輪之間的間隙作為外直交表之因子用以模擬製作及安裝時所產生的公差。改良後的風機經過AMCA 210標準測試後全壓效率比原始設計提升了約7.6%,即由原63.3 %提升至約70.9 %,,若一工廠風機24小時運作,一台風機一年可省下約12900元,且可以讓一年減少了2620 Kg的CO2排放量。 另外,本研究於最後藉由CFD軟體模擬發現,喇叭口喉部的面積及入口處面積之比率縮小可使全壓效率再度提升1.9 %;不過,另一方面,研究過程中藉由等邊基法近似阿基米德螺線用來設計風機機殼,此螺線機殼設計造成全壓效率下降約1.6 %。
Recently, energy issues emerge, the energy saving and carbon reduction, into the need to consider important factors in product development. Heavy using and long operation of industrial centrifugal fans, if you can effectively improve the efficiency of the fan will be able to significantly reduce carbon emissions and electricity costs. China set the minimum efficiency threshold for selling fans, if below the threshold it cannot be sold. This study is to help the fan company in Taiwan to get through the efficiency threshold of China as the main goal. This study considers the factors of tolerance, using the CFD software and with a Taguchi method to improve the existing backward centrifugal fan design to enhance the efficiency of the fan. By Improving appearance of inlet cone and housing make air flow more smoothly. We chose the blades of the angles b1, b2, heights b1 and b2 be the factors as the Taguchi’s inner array. Moreover, we make the tolerance of angle b1, hight b2 and the overlap between inlet cone and impellers be factors in the outer array. The improved fan after tested AMCA 210, the design it enhance about 7.6 % than the original ones. In the other hand, the efficiency enhance from 63.3 % to 70.9 %. If a fan works 24-hour in a factory, we can save about 12,900 NT dollars a year, and reduce 2620 Kg of CO2 emissions a year. In addition, this study found that narrowing the ratio between the area of inlet cone throat and entrance area can enhance the efficiency about 1.9 %. On the other hand, it is found that a housing using Archimedes spiral may inference the efficiency drop about 1.6 %.