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물과 Al₂O₃ 나노유체 적용 평판형, U-tube, 히트파이프 태양열 집열기의 성능 비교
강우빈(Woobin Kang),신윤찬(Yunchan Shin),이민정(Minjung Lee),조홍현(Honghyun Cho) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
In this study, the performance of three kinds of solar collectors was analyzed according to operating conditions through theoretical method. The flat plate, U-tube, and heat pipe solar collector was used to compare the performance with operating condition. As a result, the maximum efficiency of flat plate, U-tube, and Heat pipe solar collector was 61.3%, 59.7%, and 69.2%, respectively, when the water was used as the working fluid in the solar collector. The highest efficiency of heat pipe was 7.9% and 10.8% higher than that of flat plate and the U-tube solar collector. When the Al₂O₃ nanofluid was applied in the solar collector, the maximum efficiency of flat-plate, U-tube, heat pipe solar collector was increased by 17.9%, 16.9% and 11.3%, respectively, compared to that when the water was used.
R134a와 R1234yf 냉매 적용에 따른 냉동탑차 냉장시스템 성능비교
강우빈(Woobin Kang),신윤찬(yunchan Shin),조홍현(Honghyun Cho) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.11
Recently, the importance of delivery is being magnified according to grow online and mobile shopping market. Especially, transport of frozen food by online and home shopping is increasing, therefore, the demand of refrigeration truck is increasing. This study was to compare the performance characteristics of refrigeration system using R134a and R1234yf in a refrigeration truck. When the refrigerant charging amounts increased from 1.1 to 1.4 kg, COP of R134a system was increased and the maximum COP was 2.63 at the charge of 1.4 kg. And that of R1234yf system was 2.493 at the charge of 1.3 kg. The optimal EEV opening of COP of R134a and R1234yf system was 60% and 50%, respectively. Besides, the COP was 2.751 and 2.493 for 134a and R1234yf at the optimal EEV opening. When the compressor rotating speed increased from 1000 to 2000 rpm, the system COP of R134a and R1234yf decreased by 38.8% and 35.9%, respectively.
자율주행용 고정밀 지도를 위한 차로단위 교통정보 제공방안에 관한 연구
백창엽(Changyeob Baek),박수홍(Soohong Park),강우빈(Woobin Kang),이은일(Eunin Lee) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
This paper propose a method to provide lane-based traffic information by improving the previously constructed node-link system. The link structure set along the centerline of the road has limitations to support the route planning and route guidance of lane level for autonomous driving. Therefore, this study analyzes domestic and international standards and research cases, and applied the method to add / expand lane links to the existing node-link so as to be compatible with the existing node-link system. The additional and extended feature consists of seven attributes: LANE_ID, LINK_ID, F_NODE, T_NODE, GROUP_ID, LANE_NO, and LANES. It can be linked with previous node-link system through by foreign key. Moreover, additional and extended can be possible to provide traffic information of lane level.