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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.
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.
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.
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.
IVN 시스템을 위한 IEEE 1451 기반 중복 모듈
김현희(Hyunhee Kim),김용옥(Yongok Kim),이호기(Hoki Lee),이경창(Kyungchang Lee),이석(Suk Lee) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Drive-by-wire systems consist of bus systems, microprocessors, electrical actuators, and sensors. Replacing rigid mechanical components with dynamically configurable electronic elements triggers an almost organic, systemwide level of integration. That is, for their design safety, integration methods including reliability and fault-tolerance are required. In general, the fault-tolerance function is realized by redundancy of the communication module. In this paper, we introduced the concept and design methodology of an IEEE 1451 based dual redundant module as one method for realization of the redundancy in CAN network.
6kW급 권선형 동기 전동기를 이용한 e-Assist 시스템 개발
김기만(Kiman Kim),송춘섭(Chunsub Song),이호기(Hoki Yi),홍정표(Jungpyo Hong),이근호(Geunho Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Recently, Permanent Magnet Synchronous Motor(PMSM) are mainly used to the ISG system for high power density. Due to the cost of rare earth increasing, ensuring cost competitiveness has been to a critical issue in spite of PMSM have high power density advantage. Other types motor such as inductance motor doesn’t use rare earth, whereas have the low power density. In this paper, a developed e-Assist system that used to Wound Rotor Synchronous Motor (WRSM) is propesed to complement these drawbacks. High performance can be achieved without using the rare earth.