http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Feasibility Study on Cold Water Pipe Diameter by Friction Loss and Energy Conversion on OTEC
정훈(Jung, Hoon),허균영(Heo, Gyunyoung) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
The energy conversion from the temperature difference between hot and cold source like ocean thermal energy conversion (OTEC), requires a long and large-diameter pipe (about 1000 to 10,000 meters long) to reach the deep water. The pipe diameter ranges from 2.8 meter for proposed early test systems, to 5 meter for large, commercial power generation systems. The pipe must be designed to resist collapsing pressures produced by water temperature and density differences, and the reduced pressure required to induce flow up the pipe. Other design considerations include the external-drag effect on the pipe due to ocean currents, and the wave-induced motions of the platform to which the pipe is attached. Various approaches to the pipe construction have been proposed, including aluminum, steel, concrete, and fiberglass. More recently, a flexible pipe construction involving the use of fiberglass reinforced plastic has been proposed. This report presents the results of a scaled fixed cold water pipe (CWP) model test program performed by EES(Engineering Equation Solver) to demonstrate the feasibility of this pipe approach.
시뮬레이션 모델을 이용한 복합화력발전소 실시간 성능감시시스템의 개발
유용현(Yong Hyun Yu),최준식(Joon Sik Choi),허균영(Gyunyoung Heo),김태형(Taehyung Kim) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
With the advantages such as high efficiency, fast start-up and the supply of both electricity and heat, Combined Cycle Power Plant(CCPP) plays a critical role in the national energy mix. The efficiency management is critical because it uses expensive fuel while it is used for peak power management. However the efficiency management is technically difficult because its operation modes are frequently variable. Thus the limited analysis of thermal efficiency in a specific operation mode is normal practice in industries. The performance monitoring system suggested in this paper analyzes the thermal efficiency using the data obtained from field-installed sensors and ultimately supports condition-based maintenance. Furthermore, it enables 1) to validate the signals from the sensors installed on the site using physical/empirical models, 2) to detect the variation of efficiency on the basis of the expected performance using simulation rather than corrected performance using manufacture’s curves, and 3) to establish the strategies for expected electricity and heat supply on the basis of future weather conditions. Real-time thermal efficiency analysis which was not achieved by conventional technologies in the past is expected to contribute to optimize operation and maintenance. The suggestions made in this paper are the products from the joint project with Bundang CCCP of Korea South-East Power Company.