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우남섭,권재기,박종명,김상식,김영주,Woo, Nam-Sub,Kwon, Jae-Ki,Park, Jong-Myung,Kim, Sang-Shik,Kim, Young-Ju 대한기계학회 2013 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.1 No.1
해상에서의 시추작업은 해저면을 통해서 시추되는 유정에서 이루어지는 일련의 기계적 프로세스라 할 수 있다. 해양 시추설비는 해저에 매장된 석유나 가스의 매장량 확인을 위한 테스트 유정(well)과 이를 경제성 있는 생산용 유정으로 만들기 위해 사용되는 시설로 해양에서의 시추작업은 대부분 타 지역으로의 이동을 위해 이동식으로 제작되며, 작업 해역의 수심에 따라 크게 리그(jack-up, semi-submersible)와 드릴십(drillship)으로 구분할 수 있다. 최근에는 석유와 가스의 개발을 위한 시추작업이 급진적으로 심해로 옮겨가고 있으며 작업 가능 수심이 3,000 m에 이르고 있다. 본 논문에서는 이러한 해상 시추설비에 탑재되는 대표적 해양플랜트 기자재인 시추시스템을 소개하고 최근의 기술개발 동향을 알아보고자 한다. Offshore drilling refers to a mechanical process where a wellbore is drilled through a seabed. It is typically carried out in order to explore for and subsequently extract petroleum which lies in rock formations beneath the seabed. There are many different type of facilities from which offshore drilling operations take place. These include bottom founded drilling rigs, combined drilling and production facilities either bottom founded or floating platforms, and deepwater mobile offshore drilling units including semi-submersibles and drillships. These are capable of operating in water depths up to 3,000 m. In this paper, we introduce the drilling system, which is mounted on the offshore drilling facilities.
지열-태양열원 복합이용시스템의 운전성능 평가에 관한 연구
우남섭(Nam-Sub Woo),황인주(In-Ju Hwang),이홍철(Hong-Chul Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
This study investigated the performance of a hybrid energy system with ground and solar heat source for hot water, space heating and cooling of experimental house. The system was commissioned in August 2004 and the performance tests have been carried out since then. From the annual experiment, the average cooling and heating coefficient of performance of hybrid energy system are measured as 4.5 and 3.8, respectively. And the average annual efficiency of solar hot water supply system is measured as about 35 percent. The energy supply characteristics of the hybrid energy system were also evaluated.
Slim hole 환형관내 고-액 2상 헬리컬 유동에 관한 연구
우남섭(Nam-Sub Woo),황영규(Young-Kyu Hwang),윤치호(Chi-Ho Yun),김영주(Young-Ju Kim) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
An experimental investigation is carried out to study 2-phase vertically upward hydraulic transport of solid particles by water and non-Newtonian fluids in a slim hole concentric annulus with rotation of the inner cylinder. Rheology of particulate suspensions in viscoelastic fluids is of importance in many applications such as particle removal from surfaces, transport of proppants in fractured reservoir and cleaning of drilling holes, etc. In this study a clear acrylic pipe was used in order to observe the movement of solid particles. Annular fluid velocities varied from 0.2 ㎧ to 3.0 ㎧. Pressure drops and average flow rate and particle rising velocity are measured. For both water and 0.2% CMC solutions, the higher the concentration of the solid particles is, the larger the pressure gradients become.
우남섭(Nam-Sub Woo),서병택(Byung-Taek Seo),배경수(Kyung-Su Bae),황영규(Young-Kyu Hwang) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The present study concerns a computational study of fully developed laminar flow of a Newtonian fluid through an eccentric annulus with a combined bulk axial flow and inner cylinder rotation. This study considers the identical flow geometry as in the calculation of Escudier et al. An unexpected feature of the calculations for eccentricity ε=0.7 is the appearance of a second peak in the axial velocity, located in the narrowing gap. The distribution of the axial component of the surface shear stress has a maximum in the narrowing gap and a minimum in the widening gap.
환형관내 고 액- 2상 유동의 압력손실 변화특성에 대한 연구
우남섭(Nam-Sub Woo),한상목(Sang-Mok Han),황영규(Young-Kyu Hwang),윤치호(Chi-Ho Yoon),김영주(Young-Ju Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Field measurements have revealed that the pressure drop over a borehole during drilling of a slim oil well or a well with a long reach can depend significantly on the rotation speed of the drill pipe. An accurate prediction of the annular frictional pressure drop is therefore important for conditions where the annular clearance is small. An experimental study was carried out to study solid-liquid two phase flow in a slim hole annulus. Annular velocities of carrier fluids varied from 0.2 ㎧ to 1.5 ㎧. The carrier fluids which were utilized included tap water and CMC water solutions. Pressure drops and average flow rates were measured for the parameters such as inner-pipe rotary speed, carrier fluid velocity, hole inclination and particle injection rate. For both water and CMC solutions, the higher the concentration of the solid particles is, the larger the pressure gradients become.
지역냉방 도입을 위한 시스템 구성 및 최적화 방안 연구
우남섭(Nam-Sub Woo),이태원(Tae-Won Lee),김용기(Yong-Ki Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Demands for the high efficient and high performance energy supply system having been continuously increased according to the rise of quality of life and rapid increases of energy cost all over the world. District cooling system with combined heat and power plant offers massive and collective cooling energy production, which is higher in efficiency than conventional systems. But the district cooling system in Korea mainly consists of absorption type chiller, located in the demand sides and district hot water is supplied to the absorption type chiller. This study proposes new district cooling system configuration for district cooling with combined heat and power plant in order to maximize its benefits to a new urban development. The calculated results show that the new district cooling system is able to reduce operating costs and to get higher energy efficiency compared with conventional system.