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이수영(Soo-Young Lee),한재오(Jae-Oh Han),김태헌(Tae-Hun Kim),이재권(Jai-Kwon Lee),전완호(Wan-Ho Jeon) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
This paper proposes a new computational aeroacoustics method for an axial fan analysis. The major aeroacoustic noise source of an outdoor air-conditioner is the axial fan. It was revealed that the dominant noise source is the aerodynamic interactions between the rotating blade and stationary orifice. Many researches were focused on the fan only case. However, it does not fit to a real outdoor unit of air-conditioner. Especially, the inlet part of the axial fan of real system case is complex and not uniform. So, in order to identify the dominant noise source of axial fan, full outdoor unit analysis is important. Transient CFD analysis of full system was performed by commercial CFD code - SC/Tetra. Dominant noise source of the system was calculated by commercial CFN code - FlowNoise. The results show that not only BPF peaks but also broadband noise are similar to the measured data.
한재오(Jae-Oh Han),이수영(Soo-Young Lee),유승훈(Seung-Hun Yu),이재권(Jai-Kwon Lee) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
This paper was a study about noise reduction through flow stabilization in duct using experimental method and numerical analysis at the same time. To determine the fan's type three kinds of fans(axial fan, centrifugal fan, and axial fan with centrifugal type blades) was examined to investigate the suitability for in-line duct. As a result, under the equal number of rotation 2000 RPM, performance of an axial fan with centrifugal type blades was the most superior by 55㏈A at 4.3CMM among other fans. After this, analyzed the results of the numerical analysis to find out the optimum design of pitch angle such as 0°, 10°, 15° and 20°. The intensity of turbulence was low when pitch angle was 15° and air volume became peak by 5.08 CMM. It was observed that axis component of velocity increased gradually when pitch angle increased from 0° to 20°, and embodied noise reduction and improvement of air flow rate through flow stabilization.
학교 건물에서 환기시스템에 의한 교실내 공기질 측정 및 성능평가
신희수(Hee-Soo Shin),이재근(Jae-Keun Lee),이재권(Jai-Kwon Lee),이감규(Kam-Gyu Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
This paper describes to evaluate the performance of ventilation for investigating the removal of indoor pollutants as a function of ventilation rate and the number of occupants in the school classroom. Variations of the gas concentration as a function of time are measured at center point of classroom and air exchange rates with the CO₂ gas monitor. For the ventilator of 800 CMH in the classroom with the existence of 35 students, the average CO₂ concentration is 913 ppm. A ventilator of 800 CMH is sufficient to meet acceptable indoor air quality in the classroom of 35 students, a maximum number of students based on the Korea school standard below 1,000 ppm of CO₂.