This paper was studied to improve the efficiency of big fans through the modification of the impeller shape while maintaining other parameters such as casing geometry(shape), entry and exit diameter, rotation speed, number of blades, flow rate, and static pressure in accordance with the field requirements including the existing installation. Numerical calculation based on semi-empirical formula(SEF) and the methodology of computational fluid mechanics(CFD) were used. It is widely used in the chemical industry, and a large fan with a nominal flow capacity of 510,000 m/h and a static pressure of 11,000 Pa was used as a case study. In this study, the theoretical performance comparison and field measurements of the existing fan and crystal fan geometry designs were conducted. The results of the study showed that the modified geometric design can contribute to reducing the absorption power by up to 135 kW, thereby increasing the fan efficiency by up to 5.87%.

Abstract
1. 서 론
2. 수치해석 방법
    2.1 임펠러 개선 모델 수치분석
    2.2 기존 모델 및 제원
    2.3 수정 매개변수 및 해석
    2.4 해석결과 및 고찰
3. 결 론
후 기
References

• 정연준(Senior Researcher at Argentervo Corporation) | Yeon-Jun Jung
• 정덕화(Professor, Dept. of Liberal Education Paichai University) | Duk-Hwa Jung Corresponding author