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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.
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.
The Effects of Digital Transformation Intention of Small Traders in Domestic Traditional Industries
Dongkil Lee(이동길),Yenyoo You(유연우) 한국산업경영시스템학회 2017 한국산업경영시스템학회지 Vol.40 No.4
With the advent of the fourth industrial revolution, the digital transformation craze has intensified in diverse industries, such as finance, automotive, health care and agriculture. However, relative to industry demand, there is only few domestic research on digital transformation of small traders and no one has implemented empirical study on this field at all. Thus, the study conducted an empirical study to measure the digital transformation intention of domestic small traders. In the early days of domestic business start-ups, we searched for factors affecting the digital conversion intention of small business owners and designed an integrated framework to explain the causal relationship between factors. This study not only expanded and refined the scope of related research but also suggested the direction of another research that was not presented in previous research. However, there are limitations in many ways as much as the initial stage of a specific field of small business owners. There are limitations in explaining the overall perception of Korean small business owners. Therefore, in future studies, it is necessary to study more deeply by presenting more specific and various variables. In addition, although the number of respondents was sufficient in the process of empirical analysis, it is considered that the respondents are not enough to universalize the research result as a traditional small business person who did not convert all digital. It is necessary to carry out a comparative analysis by dividing the two groups in more detail and more specifically in the future study. The result of this study can suggest the direction for accelerating small traders’ digital transformation intention in terms of practical view, and provide useful references which can support the theoretical foundation for researchers who will perform future related research in terms of academic view.
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%.