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박건일(Gunil Park),이진호(Jinho Lee),김문성(Munsung Kim),방창선(Changseon Bang),최재웅(Jaewoong Choi),최경순(Kyongsoon Choi) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
고유가 시대에 정보시스템의 발달과 더불어 안전하고 경제적인 항해계획의 수립을 지원하는 시스템에 대한 요구가 증대되고 있다. 이에 저자들이 개발한 최적항로평가시스템에 대하여 그 개발 내용 및 적용 사례를 소개한다. 기상예보데이터를 이용하여 소요시간 및 연료소모량 관점에서 최적화된 항해 계획을 생성하며, Parametric roll을 포함한 각종 내항성능 지표를 정량적으로 평가하여, 항해자로 하여금 항해의 안전성 및 경제성 관점에서 최적화된 항해 계획을 수립하도록 지원하는 시스템을 개발하였다. 개발된 시스템의 유효성은 실 항해중 적용한 사례 및 시뮬레이션 결과를 통해서 검증하였다. For the safety and efficiency of voyage, the demand for decision support system in route planning has been increasing with the advance of information technology and the increase of oil price. According to the needs, the authors developed an optimum route assessment system. The system assists an navigator to make an optimum route plan with respect to sailing time and fuel consumption using weather forecast data. Also, the system provides the quantitative estimation for the various safety indexes including parametric roll and etc. Using these functions, a navigator is able to design the safe and efficient voyage plan. The effectiveness of system were verified by the operation during actual voyages and the simulation studies.
박성종(Seongjong Park),이희성(Heesung Lee),박건일(Gunil Park),양유성(Yoosung Yang) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Heating Ventilation and Air Conditioning system are installed in offshore production facilities, marine vessels and buildings to create a comfortable and efficient indoor environment. Recently, as ships and buildings become larger, more precise control of the air volume supplied to each indoor space is required. Generally, the air volume is controlled by the volume control dampers that make up the duct system, therefore it is necessary to improve the airflow control function of the damper. In this study, we suggested new type of blade to improve the air volume control at the circular volume control dampers. In consideration of the control and the operation, we designed a blade shape to control the flow rate more precisely and calculated the pressure loss by computational fluid dynamics, and tested the result with a prototype damper under the same flow rate and the attack of angle of the blade. The prototype damper has outperformed the conventional damper.
유기 랜킨 사이클을 이용한 선박 주기관 폐열 회수 시스템의 열역학적 분석
진정근(Jungkun Jin),이호기(Hoki Lee),박건일(Gunil Park),최재웅(Jaewoong Choi) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.7
유기 랜킨 사이클(ORC)을 이용한 선박 주기관 폐열 회수 시스템의 열역학적 분석을 수행하고 적용 가능성 및 효과를 검토하였다. 이론 해석에서는 ORC 와 ORC 에 열을 전달하기 위한 열전달 루프, 냉각수 공급 펌프를 모두 고려하여 전체 효율을 예측하였다. ORC 사이클의 성능은 증발기와 응축기의 특성과 열전달 루프의 온도 조건을 달리하여 평가되었으며 그 특성을 사이클 효율과 시스템 효율 관점에서 비교하였다. 수에즈막스 유조선에 대하여 ORC 사이클은 250℃ 이하의 폐열 조건에 대하여 약 10%정도의 열효율을 보였다. ORC 이용하여 엔진 폐열로부터 주기관 출력의 3~4%에 해당하는 전력을 생산할 수 있으며 수에즈막스 유조선에 적용 시, 정상 운항시 필요한 전력의 59~69%를 ORC 생산 전력으로 대체하여 운항 중 연료 소모량을 절감시킬 수 있는 것으로 나타났다. A thermodynamic analysis and a feasibility study on the organic Rankine cycle (ORC) as a waste heat recovery system for a marine diesel engine were carried out. The ORC and its combined cycle with the engine were simulated, and its performance was estimated theoretically using R245fa. A parametric study on the performance of the ORC system was carried out under different temperature conditions of the heat transfer loop and specification of the heat exchanger. According to the thermodynamic analysis, ~10% of the thermal efficiency of the cycle was able to be realized with the low temperature heat source below 250°C. The electric power output of the ORC was estimated to be about 4% of the mechanical power output of the engine, considering additional pumps for cooling water and circulation of the heat transfer medium. According to the present study, the electric power generated by the ORC is about 59%?69% of the required power, and it is possible to reduce the fuel consumption under normal seagoing conditions.
선박 열원 열량 변동에 따른 Dual turbine 유기 랭킨 사이클 시스템의 성능변화 고찰
이동길(Dongkil Lee),이호기(Hoki Lee),박건일(Gunil Park),최재웅(Jaewoong Choi) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.4-3
Dual turbine organic rankine cycle were studied to maximize power output of waste heat recovery system for the marine diesel engine. In this study, two turbines were parallel applied to organic rankine cycle to have better response for multiple heat sources and its variation amount. The results of this work shows that dual turbine organic rankine cycle system has better load following power output response than single turbine organic rankine cycle with variation of heat source condition. The corresponding organic rankine cycle system were simulated and verified through experiments.
유기 랜킨 사이클을 이용한 선박 주기관 폐열 회수 시스템의 열역학적 분석
진정근(Jungkun Jin),이호기(Hoki Lee),박건일(Gunil Park),최재웅(Jaewoong Choi) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
A thermodynamic analysis and feasibility study of Organic Rankine Cycle (ORC) were carried out as a waste heat recovery system for a marine diesel engine. ORC and its combined cycle with the engine were simulated and its performance was estimated theoretically under the various engine operation conditions and cooling water conditions using R245fa as working fluid. According to the thermodynamic analysis, ~10% of thermodynamic efficiency of the cycle was able to be realized with the low temperature heat source below 250℃. The electric power output of the ORC was estimated to be about 4% of the mechanical power output of the engine considering additional pumps for cooling water and circulation of the heat transfer medium.
선박 주기관 폐열 회수를 위한 유기 랭킨 사이클 시스템 최적화
이동길(Dongkil Lee),이호기(Hoki Lee),박건일(Gunil Park),최재웅(Jaewoong Choi) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Addition of evaporator and preheater were studied to maximize output power of organic rankine cycle as a waste heat recovery system of the marine diesel engine. Exhaust gas, scavenge air and jacket cooling water were considered as possible heat sources to be recovered. Dual loop system which has multiple heat transfer loops for each waste heat source shows better performance than the single loop system which has only one heat transfer loop. By changing ORC evaporator and preheater, the output of ORC increased by 6~27%.
선박 내 폐열 회수 시스템 구성을 고려한 유기 랭킨 사이클의 열역학적 분석
이동길(Dongkil Lee),진정근(Jungkun Jin),이호기(Hoki Lee),박건일(Gunil Park) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
The present work focuses on the heat transfer loop of Organic Rankine Cycle - Waste Heat Recovery System (ORC-WHRS) for the vessel. The heat transfer loops were evaluated based on the power output of thermal cycle. Performances of ORC were calculated at the different temperature conditions of thermal loop. Calculated results were compared in terms of cycle and system efficiency. The result shows additional electricity of Maximum. 660㎾e can be produced by using ORC-WHRS, and the system has 9~13% of cycle efficiency depends on the heat transfer loop design and pinch condition of heat exchanger. In this work shows, ORC-WHRS can produce 60~73% of required electricity of Suez-max COT at the normal operation running condition and this lead to fuel saving effect.