• 한국생산제조학회지
• /
• 제21권4호
• /
• pp.570-574
• /
• 2012

Spread of household air conditioning system is continued to be increased. Axial fan in the external unit of air conditioning system is for ventilation and air supplying unit, and the related products have been widely adopted as household electronics, automobile engine, big sized blower in factory, tunnel, and subway. In this study, commercial 3-winged propeller fan is modified to shape and modified to 2-winged fan for the airflow increase and cost reduction. Using 3D modelling, the fan shape is modified, and analysis flow is adopted to provide the way to airflow increase and reduce cost while maintaining the same wind capacity.

• Journal of Advanced Marine Engineering and Technology
• /
• 제38권2호
• /
• pp.202-207
• /
• 2014

Recently, the study of energy saving technology of ships begins in earnest, as energy saving policies are performed all around the world. SEMS (Ship Energy Management System) is one of the techniques to increase energy efficiency by applying to a independent system like a ship and offshore. SEMS is composed of Cooling Pump Control System (CPCS), Renewable Energy Emergency Power Control System (REEPCS), Load Control System (LCS), and Heating, Ventilation, and Air Conditioning System (HVACS). SEMS is enable to increase energy efficiency and achieve integrated management through the interlocking of each system. Especially, it is possible to improve the flexibility of the selection of the generator capacity in conjunction with a rechargeable battery and renewable energy. In this paper, SEMS applied rechargeable battery is proposed and simulated. By applying the rechargeable battery, it was confirmed that SEMS applied rechargeable battery can be operated at optimum efficiency of the generator.

• 한국전산유체공학회지
• /
• 제11권4호
• /
• pp.26-31
• /
• 2006

In the present study, a numerical simulation of the subway carriage fire is performed to determine the more effective operation of Trackway Exhaust System(TES) in underground stations. The four types of possible TES operation (OSUS, OSUE, OEUS and OEUE) is simulated and compared their removal capability of smoke and hot temperature for the carriage fire of 2MW. From the results, the distribution of temperature and smoke concentration is more dependent on the operation of fans located at upper side of the platform than those at lower side. It is also found from the results that for more efficient smoke control, the fans at upper side of the platform should be operated as an exhaust system. Whereas the fans at lower side can be operated as a supply system to aid upper exhaust fans.

• 한국산학기술학회논문지
• /
• 제15권3호
• /
• pp.1681-1684
• /
• 2014

본 논문에서는 석탄화력 발전소의 보일러에서 통풍계통의 맥동을 실시간으로 측정할 수 있는 장치에 관한 것이다. 500MW급 대용량 보일러 통풍계통의 맥동 감시장치는 팬 이상 발생시 팬을 보호하기 위하여 정지시키는 기능을 한다. 그러나 맥동 감시 장치의 빈번한 고장으로 신뢰성이 저하되고 운전에 영향을 미치므로 이것을 DCS(Distributed Control System) 로직으로 구성하여 신뢰성을 향상시켰다.

• 한국화재소방학회:학술대회논문집
• /
• 한국화재소방학회 2011년도 추계학술논문발표회 논문집
• /
• pp.478-481
• /
• 2011

This study is intended to evaluate and optimize the characteristics of smoke spreading and the appropriateness of evacuation time extended by operation of smoke control system during fire within the underground space of the building structured in compliance with the smoke control system performance criteria from the local fire safety standard, which has been currently applied to the buildings in Korea. Using the heat release per unit weight of the combustibles, a numerical analysis both in case of smoke control system in operation and the system not in operation was carried out at the several different shopping malls. From the viewpoint of securing the evacuation time, the results were compared in an attempt to assess the appropriateness of the fire safety criteria.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2004년도 춘계학술대회
• /
• pp.1250-1254
• /
• 2004

To develop more compact and light generators which have high capacity, the most important thing that should be considered is the inner cooling system. Under all circumstances, the temperature of rotor and stator windings must be kept below the maximum temperature of insulation to maintain reliability and prolong durability of the machine. Therefore, the development of more effective cooling system and the exact prediction of windings are essential to produce our unique generator model which is reliable and competitive in international market. In this study, the flow of cooling air and the temperature distribution of winding is analyzed by using computational fluid dynamics. This analysis can lead to optimize the structure of cooling system and predict a local temperature rise.

• 한국실내디자인학회논문집
• /
• 제9호
• /
• pp.10-17
• /
• 1996

With the ever-increasing important of high-speed information in society as we move towards the 21 st century. Interior design and it's working condition has been changed a great deal included a sort of each special character and make a difference against the others. It used to be find a great poles asunder of worker's safety and project quality according to the environmental dimension of interior construction field as if they should be a pleasantness or poor condition. This research aimed to improvement of environmental construction field of interior with construction engineers and particular interior labors in 4 phases as : ⅠThe preparatory phase : -Secure a Budget, Environmental safety supervisor -Fix of Design quality, Construction period. -Choice of Construction method, Sub constructing Ⅱ. Starting work phase ; -Capacity , Safety of temporary power line. -Carriage, Stock of Material -Safety of Electronic tools, -Personal protector. Ⅲ. Working period ; -Ventilation, I illumination of working place. -Measurement of environmental working condition Ⅳ.Finish working phase ; -Analysis of measurement data. -Evaluation and making up for the weak point. -Keeping data.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2007년도 제38회 하계학술대회
• /
• pp.2066-2067
• /
• 2007

지중송전선로는 2006년 기준으로 전체 송전선로의 8.8%를 차지하고 있으며 그 점유비율은 점차 증가하는 추세이다. 지중송전선로의 주요 구조물 중 하나인 전력구는 "토목구조물 시공 -부대설비 시설 - 케이블 포설"의 순서로 공정이 진행된다. 전력구 부대설비 중 환기설비, 배수시설에 대한 검토는 토목 구조물의 기초설계시에 설치위치와 더불어 그 규격에 대한 검토가 이루어져여 하나 관련 기준이 명확하지 않아 정확한 검토에 어려움이 따른다. 본 논문에서는 최근 개정된 한전 설계기준 및 제정된 전력구부대설 비시설기준을 토대로 집수정의 규격에 대한 검토기준을 제시하였고 아울러 환기설비에 대한 설계방법을 구체적으로 제시하였다.

• Geomechanics and Engineering
• /
• 제17권6호
• /
• pp.573-581
• /
• 2019

Excavation of underground cavern and shaft was proposed for the construction of a ventilation facility in an urban area. A shaft connects the street-level air plenum to an underground cavern, which extends down approximately 46 m below the street surface. At the project site, the rock mass was relatively strong and well-defined joint sets were present. A kinematic block stability analysis was first performed to estimate the required reinforcement system. Then a 3-D discontinuum numerical analysis was conducted to evaluate the capacity of the initial support and the overall stability of the required excavation, followed by a 3-D continuum numerical analysis to complement the calculated result. This paper illustrates the application of detailed numerical analyses to the design of the required initial support system for the stability of underground hard rock mining at a relatively shallow depth.

• 한국철도학회논문집
• /
• 제15권6호
• /
• pp.579-587
• /
• 2012

서울 지하철 지하역사의 평상시 및 비상시(화재시)의 급배기 효율을 조사하기 위하여 대표적인 대심도역사인 신금호 역사를 선정하여 설계 용량 대비 실제 용량을 계측하여 비교분석 하였다. 신금호 역사는 심도가 43.6m(서울에서 3번째 깊이) 이며, 지하8층의 섬식 승강장과 지하 1,2층의 대합실로 이루어져 있다. 승강장과 대합실을 연결하는 통로는 1개의 비상계단을 사용하도록 되어있다. 실험을 위하여 열선유속계, capture hood, 풍향풍속계 및 데이터 수집장치 등을 이용하여 자동 계측하였다. 실험 결과 평상시 대합실에서는 급기량 및 배기량이 설계치에 비하여 실측치가 각각 34% 및 46% 감소된 환기량을 보였으며, 승강장에서는 급기량 및 배기량이 각각 66% 및 38% 감소된 환기량을 보였다. 비상시에서는 대합실에서 급기량이 42% 감소, 승강장에서는 배기량이 28% 감소된 것으로 조사되었다. 따라서 평상시에는 역사에서의 공기질 악화 및 비상시에는 제연능력 약화가 예상된다.