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강명철(Kang, Myeongcheol),강용혁(Kang, Yongheack),윤환기(Yoon, Hwanki),유창균(Yu, Changkyun) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
This experimental study represents the results of an analysis on the characteristics of flux density distribution in the focal region of solar concentrator. The characteristics of flux density distributions are investigated to optimally design and position a cavity receiver. This was deemed very useful to find and correct various errors associated with a dish concentrator. We estimated the flux density distribution on the target placed along with focal lengths from the dish vertex to experimentally determine the focal length. It is observed that the actual focal point exists when the focal length is 2.17m. The total integrated power and percent power was 2467W and 85.8%, respectively, in the case of small dish, and also 2095W and 79%, respectively, in the case of KIERDISH II. As a result of the percent power within radius, approximately 90% of the incident radiation is intercepted by about 0.06 m radius. The minimum radius of receiver in KIERDISH II is found to be 0.15m and approximately 90% of the incident radiation is intercepted by receiver aperture.
실작업 굴삭기에 장착한 연비계를 이용한 공회전 정지에 따른 연료 소비량 저감 효과 연구
강명철(Myeongcheol Kang),정진범(Jinbeom Jeong),이종혁(Jonghyeok Lee),이진학(Jinhak Lee),이대엽(Daeyup Lee) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Since the fuel economy of an excavator will be regulated in near future, it is required to study measures to reduce fuel consumption. Currently, idle stop technology is widely used in vehicles worldwide, however, its effect in an excavator in real work sites has hardly been studied. In this work, In order to study the effect of idle stop in an excavator at real work sites, fuel consumptions of both engine idling and starting are experimentally measured. Using the on board fuel meter built in this work, the fuel consumption of an excavator in real work sites is investigated. This work concludes that, throughout six real work sites, an enhancement of fuel economy up to 5.5% is estimated using the fuel consumptions of engine idle and starting measured in this work.