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채호병,서석호,정용찬,이수열,Chae, Hobyung,Seo, Sukho,Jung, Yong Chan,Lee, Soo Yeol 한국전력공사 2015 KEPCO Journal on electric power and energy Vol.1 No.1
초임계 이산화탄소 발전 시스템 구축을 위해서는 고온, 고압의 열악한 환경에 노출되는 터빈, 열 교환기, 압축기와 같은 핵심 부품들의 내식성 평가는 반드시 수행되어야 한다. 이를 위해 후보소재 3종 Ferritic-Martensitic Steel (T92), Austenitic Steel (SS316L), Ni-based Alloy (IN738LC)를 선정하여 고온의 유사 초임계 $CO_2$ 발전 환경에서의 내식성 평가를 진행하였다. $600^{\circ}C$, $700^{\circ}C$의 2개의 온도 구간에서 $CO_2$ 분위기를 조성하여 800 시간 동안 노출시킨 뒤, Weight Change, Surface Morphology, Cross Section, Composition을 분석하였다. Cr-rich Protective Layer를 형성하는 Ni-based Alloy와 Fe/Cr-rich oxide를 형성하는 Austenitic Steel은 우수한 부식 저항성을 보인 반면에 Ferritic-Martensitic Steel은 높은 Weight Change와 Fe-rich Non-Protective Oxide가 관찰되어 상대적으로 낮은 부식 저항성을 보였다.
고온 이산화탄소 분위기에서 316 L 스테인리스강의 부식 거동
채호병,서석호,정용찬,이수열,Chae, Hobyung,Seo, Sukho,Jung, Yong Chan,Lee, Soo Yeol 한국재료학회 2017 한국재료학회지 Vol.27 No.10
Evaluation of the durability and stability of materials used in power plants is of great importance because parts or components for turbines, heat exchangers and compressors are often exposed to extreme environments such as high temperature and pressure. In this work, high-temperature corrosion behavior of 316 L stainless steel in a carbon dioxide environment was studied to examine the applicability of a material for a supercritical carbon dioxide Brayton cycle as the next generation power plant system. The specimens were exposed in a high-purity carbon dioxide environment at temperatures ranging from 500 to $800^{\circ}C$ during 1000 hours. The features of the corroded products were examined by optical microscope and scanning electron microscope, and the chemical compound was determined by x-ray photoelectron spectroscopy. The results show that while the 316 L stainless steel had good corrosion resistance in the range of $500-700^{\circ}C$ in the carbon dioxide environment, the corrosion resistance at $800^{\circ}C$ was very poor due to chipping the corroded products off, which resulted in a considerable loss in weight.
에너지파일 이용 지열시스템의 채열성능 예측수법에 관한 연구
채호병(Chae, Ho-byung),남유진(Nam, Yujin) 한국건축친환경설비학회 2012 한국건축친환경설비학회 학술발표대회 논문집 Vol.2012 No.10
Recently, ground source heat pump systems(GSHP) utilizing annualy stable ground temperature for energy saving have been attracted in many buildings. these systems can achieve higher performance of system by supply more efficient heat source to the heat pump than the conventional air-source heat pump system. But, GSHP systems have disadventage due to increase of initial installation and boring cost. In onder to reduce the initial cost, many researches have focused on the energy-pile system using the structure of the building as a heat exchanger. However, there are few studies on the prediction method of heat exchange rate for energy piles. In this study, the prediction methood using the ground heat transfer model and ground heat exchanger model has been developed for the energy pile system using barrette pile.
Barrette 파일을 이용한 지열시스템의 채열 성능 예측 및 경제성 분석에 관한 연구
채호병(Ho-Byung Chae),남유진(Yujin Nam),박용부(Yong-Boo Park) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.11
Ground source heat pump systems (GSHP) can achieve higher performance of the system, by supplying more efficient heat source to the heat pump, than the conventional air-source heat pump system. But building clients and designers have hesitated to use GSHP systems, due to expensive initial cost, and uncertain economic feasibility. In order to reduce the initial cost, many researches have focused on the energy-pile system, using the structure of the building as a heat exchanger. Even though several experimental studies for the energy-pile system have been conducted, there was not enough data of quantitative evaluation with economic analysis and comprehensive analysis for the energy-pile. In this study, a prediction method has been developed for the energy pile system with barrette pile, using the ground heat transfer model and ground heat exchanger model. Moreover, a feasibility study for the energy pile system with barrette pile was conducted, by performance analysis and LCC assessment. As a result, it was found that the heat exchange rate of a barrette pile was 2.55 kW, and the payback period using LCC analysis was 8.8 years.
채호병 ( Hobyung Chae ),김우철 ( Woo Cheol Kim ),김희산 ( Heesan Kim ),김정구 ( Jung-gu Kim ),김경민 ( Kyung Min Kim ),이수열 ( Soo Yeol Lee ) 한국부식방식학회(구 한국부식학회) 2021 Corrosion Science and Technology Vol.20 No.2
In this work, we have performed a corrosion failure analysis of a leaking tube connected to an upper header of a condensate pre-heater in a heat recovery steam generator. It was revealed that the leakage position in the tube was the location where the materials were easily vulnerable due to tensile residual stresses induced by the material manufacturing process and welding process. In addition to an imbalance in the module induced by temperature difference during operation of the pre-heater, the weight of the modules and thermal fatigue provoked a type of stress of tensile-tensile fatigue on the tube. Thus, the leakage position of the pre-heater was exposed to the tensile stress on the inner surface of the tube facing the gas, which rendered the unstable oxide layer susceptible to corrosion and the formation of pits on the water side. The cracks propagated along with the degraded microstructure in a transgranular cracking mode under fatigue loading and finally resulted in water leakage.
채호병(Ho-Byeong Chae),김환용(Hwan Yong Kim),박태형(Tae Hyoung Park) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.10
We propose a path planning method to decrease a inspection lead time of line scan camera in SMT(surface mount technology) in-line system. The inspection window area of printed circuit board should be minimized to consider the FOV(field of view) of line scan camera so that line scan inspector is going to find a optimal solution of path planning. We propose one of the hierarchical clustrering algorithm for a given board. Comparative simulation results are presented to verify the usefulness of proposed method.