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고효율 룸 에어컨 설계를 위한 유동 분포 측정에 관한 연구
이수홍(Soo-Hong Lee),라선욱(Seon-Uk Na),강근(Geun Kang),고한서(Han Seo Ko) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
Test models which have geometrical similarities with a real room air conditioner (RAC) have been manufactured including visualization windows so that a laser beam can pass through a cross flow fan. Then, flow distributions of the RAC have been investigated using a visualization technique such as a Particle Image Velocimetry (PIV) to analyze an efficiency and noise of the RAC. Pitot tubes have also been used to measure the flow velocity inside the RAC with various positions to confirm the measurement accuracy of the PIV technique. The measured flow velocities have been analyzed and new designs of the RAC have been proposed to improve the efficiency and to reduce the noise for the RAC in this study.
슈퍼 컴퓨팅 환경에서 메타 컴퓨터를 위한 전산 유체 해석 프로그램의 수행 시간 예측 도구 개발
강경우(Kyung-Woo Kang),라선욱(Seon-Uk Na) 한국전산유체공학회 1999 한국전산유체공학회 학술대회논문집 Vol.1999 No.-
A metacomputing system is constructed by integrating the heterogeneous supercomputers at KOROIC supercomputer .center. The implementation is directed toward building up' an easy-ta-use supercomputing environment for Computational Fluid Dynamics (CFD) simulations. The key feature is an automatic resource selection According to the predicted performance, the system assigns the request job to the most suitable resource which satisfies the user's demands. Verification tests are conducted by using example CFD applications. An overview of the system is given and derivation of performance prediction models is described in details. Discussion is made of the test results to illustrate applicability and usefulness of the proposed models.
이수홍(Soo-Hong Lee),라선욱(Seon-Uk Na),강근(Geun Kang),고한서(Han Seo Ko) 한국가시화정보학회 2009 한국가시화정보학회 학술발표대회 논문집 Vol.2009 No.11
Flow distributions of a room air conditioner (RAC) have been investigated using a visualization technique such as a Particle Image Velocimetry (PIV) to analyze an efficiency and noise of the RAC. Pitot tubes have also been used to measure the flow velocity inside the RAC with various positions to confirm the measurement accuracy of the PIV technique. Then, numerical analyses have been carried out by developing Computational Fluid Dynamics (CFD) programs to calculate the flow velocity inside the RAC. From the results of the experimental and numerical studies, new designs of the RAC have been proposed to improve the efficiency of the RAC. Various flow distributions by controlling the outlet flow velocity have been observed experimentally and numerically to compare the efficiencies between different RAC models in this study.
이수홍(Soo-Hong Lee),라선욱(Seon-Uk Na),강근(Geun Kang),고한서(Han Seo Ko) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Flow distributions of a room air conditioner (RAC) have been investigated using a visualization technique such as a Particle Image Velocimetry (PIV) to analyze an efficiency and noise of the RAC. Pitot tubes have also been used to measure the flow velocity inside the RAC with various positions to confirm the measurement accuracy of the PIV technique. Then, numerical analyses have been carried out by developing Computational Fluid Dynamics (CFD) programs to calculate the flow velocity inside the RAC. From the results of the experimental and numerical studies, new designs of the RAC have been proposed to improve the efficiency of the RAC. Various flow distributions by controlling the outlet flow velocity have been observed experimentally and numerically to compare the efficiencies between different RAC models in this study.
Study on Flow Structure inside Room Air Conditioner Using Visualization Technique
이수홍(Soo-Hong Lee),라선욱(Seon-Uk Na),강근(Geun Kang),고한서(Han Seo Ko) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Whole flow fields of a room air conditioner (RAC) have been visualized by a Particle Image Velocimetry (PIV) technique to analyze the flow structure with various inlet and outlet angles, and to control an eccentric vortex which affects an efficiency and noise of the RAC. A test model with 5 stages of a cross flow fan has been manufactured and a transparent acryl has been installed at the side of the test model for the PIV experiment. The inlet and outlet flows and the flow inside the cross flow fan have been analyzed by varying the inlet grill angles and outlet blade angles. The movement of the eccentric vortex has been investigated experimentally by developing the measurement technique for the inner flow field of the cross flow fan. From the visualization of the inner flows, the origins of the noise inside the RAC and the condensation points around the outlet parts of the cold air have been observed and the solution of the problems can be proposed in this study.
이아미(A-Mi Lee),한규일(Kyu-Il Han),주재만(Jaeman Joo),라선욱(Seon-Uk Na),김동원(Dong-Won Kim),고한서(Han Seo Ko) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
Internal and inlet flows of a cross-flow fan have been visualized using a particle image velocimetry(PIV) to analyze a relationship with a performance of a room air conditioner(RAC). A test model which has a geometric similarity with the real RAC has been manufactured for the experiment and the flow characteristics have been analyzed with various flow rates and inlet grill angles for the cross-flow fan. The experimental results using the PIV technique have been compared with the existing numerical results. Also, a location and movement of an eccentric vortex which can affect the performance and noise of the RAC has been investigated by the PIV with various flow rates and inlet grill angles.
유동 가시화 기법을 이용한 RAC의 이슬 맺힘 특성에 관한 연구
이아미(A-Mi Lee),김동원(Dong-Won Kim),라선욱(Seon-Uk Na),고한서(Han Seo Ko) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Although noise of a RAC can be reduced effectively by decreasing RPM, condensation problems can occur to reduce reliability of the RAC for low RPM. Thus, this research has been performed to propose a design guideline of the RAC for low-noise RPM with high reliability. The internal and external flows of the RAC have been visualized and analyzed by a PIV technique to solve the condensation problem at an outlet and impeller. Then, the design guideline has been proposed by the analyzed results and confirmed by wind-tunnel and noise tests to reduce the condensation problem. Finally the shapes of the outlet with reduced condensation problem and the impeller with low noise have been obtained in this study.
세탁기 드럼 내부의 습기 방출 메커니즘에 대한 수치 연구
정충효(Chung-Hyo Jung),손덕영(Deok-Young Sohn),라선욱(Seon-Uk Na),최윤호(Yun-Ho Choi) 한국생산제조학회 2016 한국생산제조학회지 Vol.25 No.1
Washing machine manufacturers typically advise consumers to maintain the relative humidity in the drum less than 80% for three days after the termination of a washing cycle in order to prevent bacteria proliferation. A vent installed in the back of a washing machine is used to release moisture to satisfy this condition. Up to now, the design and installation of the vent have been based on experiments without understanding its roles and physical phenomena. In this study, various CFD results are presented in order to explain the physical mechanism of moisture release in a washing machine. Two methods of moisture release (diffusion and convection) were studied; diffusion was found to be the dominant process in removing moisture. Experiments were also performed to validate this behavior. In addition, this study will aid in the efficient design of vents to keep the relative humidity low inside the drum.