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- 저자 : 구본철(Boncheol Ku) (검색결과 4 건)
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나노 윤활유를 이용한 압축기 습동부 재질의 경도에 따른 윤활특성 평가
한영철(Youngcheol Han),구본철(Boncheol Ku),이광호(Kwangho Lee),황유진(Yujin Hwang),이재근(Jaekeun Lee) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
In this study, lubrication characteristics of sliding members were compared with the change of the hardness of friction surfaces and the application of nano-oil. The materials of the specimens were gray cast iron (AISI 35, AISI 60) and nickel chromium molybdenum steel (AISI 4320). The Friction coefficients and the temperature variations of on the frictional surfaces were measured by disk-on-disk tribotester under the condition of fixed rotating speed. The friction surfaces were observed by scanning electron microscope (SEM). In the results, the friction coefficients of the disk surface were increased as hardness difference was increased. The friction coefficient lubricated in nano-oil was less than mineral oil. This is because a spherical nano particle plays a tiny ball bearing between the frictional surfaces, improved the lubrication characteristics.
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고체 윤활제와 나노 오일 적용을 통한 압축기 습동부 윤활특성 평가
박정훈(Junghoon Park),구본철(Boncheol Ku),이재근(Jaekeun Lee) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
The effects of nano-oil(C??, 0.1vol%) and solid lubricants(bare, Mn-phosphate, MoS₂, steam coated on the rotating plate) on wear and friction characteristics of friction materials were studied using a Disk-on-disk type friction tester for different normal loads. Tribological properties were evaluated by measuring friction surface temperature and the friction coefficient, and interpreted in terms of the Stribeck curve. In addition, the topography of friction surface was analyzed by scanning electron microscopy(SEM). Result of this work showed that the friction coefficient of the mineral oil and nano-oil increased as following the MoS₂ on the list were Mn-phosphate, bare, steam and the friction coefficients for all nano-oil were higher than those of mineral oil. Also, we have found that the difference of friction coefficient between mineral oil and nano-oil was outstanding when the property of solid lubricants coated on the friction member of mineral oil was soft and the normal load is high. Our results indicate that the addition of fullerene additives in lubricant was more effective when the property of solid lubricants coated on the friction member of mineral oil was soft under the higher normal load conditions.
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학교 기숙사 순시 부하 패턴에 따른 소형열병합발전 경제성 분석
박종규(Jonggyu Park),구본철(Boncheol Ku),송재도(Jaedo Song),이정언(Jungeun Lee),이재근(Jaekeun Lee) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
Cogeneration systems can simultaneously produce electricity and heat energy. Applications of cogeneration systems have been increased in residential buildings and factories in Korea. In order to optimize the configuration of cogeneration, a capacity based on the pattern of annual demands of electricity, heating and cooling of application site are considered. This paper describes energy demands patterns and rate of power to heat based on electricity and heat loads in dormitory. In addition, It describes the optimal a capacity of the cogeneration system and payback period in university dormitory. The optimal design for cogeneration system with the increase of the capacity considering life cycle cost(LCC) analysis has been performed in the dormitory. In spite of the fact that previous LCC analysis was based on the monthly energy consumption, the developed LCC analysis was based on the heat-power rate according to hourly energy consumption. So developed LCC analysis anticipated the operation rate of cogeneration system more correctly. Variables used in LCC analysis are electricity cost escalation rate, interest rate, and service lives. In addition, the payback period for the optimal cogeneration system depending on the energy tariff system was calculated. When cost of electricity system multiplies 2.2, a payback period becomes 10 years in 60 kW capacity of a cogeneration system.
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LCC 분석을 고려한 일반 시설물에서 소형열병합발전의 최적 설계
강율호(Yulho Kang),구본철(Boncheol Ku),황유진(Yujin Hwang),송재도(Jaedo Song),정성일(Seongir Cheong),이재근(Jaekeun Lee) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.8
Cogeneration system produces power as well as heat recovered from waste heat during power generation process. This system has higher energy efficiency than that of the power plant. In this study the optimal design for the cogeneration system with the increase of the capacity considering life cycle cost(LCC) analysis has been performed in the general facilities such as hotels and hospitals under the assumption of electricity cost of 95 won/㎾h, the initial cost of cogeneration system of 1,500,000 won/kW and the value of 0.5~1.0 in the ratio of heat to power. The optimal ratio of cogeneration capacity divided by average electricity load of facility was found out more than 0.5 in case of electricity cost with the increase of > 30%, and the percentage of CO₂ reduction was about 9%. The most important factors in the economic analysis of cogeneration system was found out the electrity cost and the initial cost of cogeneration system. Also the ratio of heat to power at the value of > 0.5 was not affected in the economy of cogeneration system, but was very important in the CO₂ reduction.
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