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Helical-type drag pump의 회전자의 압력측정
김도행(Do-haeng Kim),권명근(Myoung-keun Kwon),황영규(Young-kyu Hwang) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Recently, Turbo-type molecular drag pumps (MDPs) are widely used in the liquid crystal display (LCD), semiconductor and other thin film industries. Siegbahn (disk-type) molecular drag pumps are used as high-pressure stages in the hybrid-type turbomolecular pumps, where they can operate in the viscous, the transition and the free molecular flow regime. In this study is performed to investigate the pumping characteristics of helical-type molecular drag pump (HTDP) in the molecular transition flow region. The experiments are measured by using five pirani gauges around casing wall of HTDP. The test is performed with nitrogen gas (N2). We measured the ultimate pressure and compression ratio in the range of the outlet pressure 0.2 ~ 533 Pa for HTDP.
김도행(Do-haeng Kim),권명근(Myoung-keun Kwon),황영규(Young-kyu Hwang) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The present study is numerically and experimentally performed to reveal the pumping characteristics of a helical-type molecular drag pump (HTDP) in the molecular transition flow region. In the experimental study, the pressures are measured simultaneously at the 5 positions along the helical channel of rotor under various conditions of outlet pressure and throughputs, and nitrogen is used as test gas. The outlet pressure is in the range of 26 - 533 Pa. As results, the local pressure changes are checked corresponding to the various outlet pressure and throughput of HTDP. In the numerical study, Navier-Stokes equations with slip boundary conditions are employed (Re< 1000, Kn< 0.1). The local pressure distribution and the pumping speed are calculated. The numerical results are compared with the experimental results. The numerically computed value agrees with the experimental data within an error of approximately 5%.
원판형 분자 드래그 펌프와 헬리컬 분자 드래그 펌프의 회전자에 대한 압력비교
김도행(Do-haeng Kim),권명근(Myoung-keun Kwon),황영규(Young-kyu Hwang) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Recently, Turbo-type molecular drag pumps (MDPs) are widely used in the liquid crystal display (LCD), semiconductor and other thin film industries. Molecular drag pumps are used as high-pressure stages in the hybrid-type turbomolecular pumps, where they can operate in the viscous, the transition and the free molecular flow regime. In this study is performed to investigate the pumping characteristics of disk-type molecular drag pump(DTMDP) and helical-type molecular drag pump(HTMDP) in the molecular transition flow region. The experiments are measured using five vacuum pressure gauges in the positions for rotors. The test is performed with nitrogen gas (N2). The present study is performed to investigate pumping characteristics of two pumps in the outlet pressure range from 0.4 to 533 ㎩.
권명근(Kwon Myoung-Keun),김도행(Kim Do-Haeng),황영규(Hwang Young-Kyu) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Turbo-type molecular drag pumps (MDPs) are used in the liquid crystal display (LCD), semiconductor and other thin film industries. Siegbahn (disk-type) molecular drag pumps are used as high-pressure stages in the hybrid-type turbomolecular pumps, where they can operate in the viscous, the transition and the free molecular flow regime. In this study is performed to investigate the pumping characteristics of three-stage disk-type molecular drag pump (DTDP) in the molecular transition flow region. The experiments are measured using five vacuum pressure gauges in the positions for rotors of DTDP. The test is performed with nitrogen gas (N₂).
히트펌프 의류 건조기 누설 위치에 따른 건조성능 변화 분석에 관한 연구
정찬훈(Chan Hun Jeong),신현수(Hyun Soo Shin),김도행(Do Haeng Kim),권오진(Oh Jin Kwon),윤백(Baek Youn) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
Recently, countries around the world have been strengthening energy regulations to cope with climate change. Along with this trend, the regulations for home appliances are getting more tightened, and a great deal of efforts are being made to improve energy efficiency of clothes dryer. There have been studies on the effect of leakage for the vented-type clothes dryer, while little attentions have been paid to the effect of the locations of leakage on the performance for heat pump dryers. The present study aims to address the effect of the locations of leakage on the performance, i.e. drying time and energy consumption, for heat pump dryers using the analytical model combining heat and mass transfer inside drum and refrigeration cycle. A dimensionless parameter was suggested to qualitatively predict the effect of the positions of leak-in and leak-out of air for the dryer system. As a result, it was found that the drying performance was considerably affected by the location of leakage, and there exists a correlation between the dryer performance and the suggested dimensionless parameter. It is expected that the result of the present study would be helpful improving energy efficiency when designing a heat pump clothes dryer.
빨래 내 수분 함유율 및 빨래 무게에 따른 드럼 내 공기 유량에 관한 실험적 연구
강석경(Suk kyung Kang),안종혁(Jong Hyeok An),신현수(Hyun Soo Shin),윤백(Baek Youn),유재석(Jai Suk Yoo),김현정(Hyun Jung Kim),조병남(Byeong Nam Jo),위훈(Hoon Wee),김도행(Do Haeng Kim),권오진(Oh Jin Kwon) 대한설비공학회 2020 대한설비공학회 학술발표대회논문집 Vol.2020 No.6
건조기 드럼 내부에서 발생하는 빨래와 공기 사이의 열 및 물질전달 현상은 공기 유량의 지배적인 영향을 받기 때문에, 공기 유량은 건조 시간과 적산전력으로 대표되는 건조기의 성능에 큰 영향을 미친다. 또한 공기의 유량은 빨래 내 수분 함유율의 영향을 받는다. 그러나 건조기 드럼 내부의 열 및 물질전달 현상을 해석한 대부분의 연구에서는 공기의 유량이 일정하다고 가정하였다. 따라서 본 연구에서는, 16f㎏ 용량의 가정용 건조기를 대상으로, 다양한 빨래 내 수분 함유율 및 빨래 무게에 따른 유량을 측정하였으며, 공기의 유량이 빨래 내 수분 함유율의 영향을 받는다는 것을 실험적으로 확인하였다. 실험 결과 빨래 내 수분 함유율이 감소함에 따라 공기의 유량이 감소하였으며, 또한 빨래 무게가 상이함에도 불구하고 수분 함유율 변화에 따른 무차원화된 유량(수분 함유율이 최대일 때 유량 대비 유량)의 변화 경향이 유사하였다.
빨래 무게 및 수분 함유율에 따른 건조기 드럼 내부 유량 변화에 관한 실험적 연구
강석경(Suk Kyung Kang),안종혁(Jong Hyeok An),신현수(Hyun Soo Shin),윤백(Baek Youn),유재석(Jai Suk Yoo),김현정(Hyun Jung Kim),조병남(Byeong Nam Jo),위훈(Hoon Wee),김도행(Do Haeng Kim),권오진(Oh Jin Kwon) 대한설비공학회 2021 설비공학 논문집 Vol.33 No.1
The air flow rate inside drum is one of the most important factors determining the performance of clothes dryer. It is obvious that the amount of heat and mass transfer inside drum depends on the air flow rate, which shows an irregular and unsteady behavior since the flow resistance varies with the position and arrangement of clothes which move around arbitrarily inside rotating drum. Also it was found that the air flow rate varied with moisture content in clothes, and thus it varied as the clothes was dehydrated. In the present work, the effect of the weight of clothes and the moisture content on the air flow rate for various fan RPM has been studied experimentally for drums with different sizes, and normalized air flow rate correlations have been proposed. It is expected that the results of the present work would be helpful in analyzing the transfer phenomena inside drum more accurately.