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IoT기반의 자외선(UVC) 책 살균 장치 시스템 개발
황병훈(Byunghun Hwang),김언규(Eon-Gyu Kim),장용수(Yongsoo Jang) 대한전자공학회 2020 대한전자공학회 학술대회 Vol.2020 No.8
This paper presents the development of an IoT system for online monitoring and management of book sterilizer using Ultraviolet(UVC) LEDs. We developed OMS(Online Maintenance System) to store, manage, and analyze daily operation data of major parts collected through the data collection board. This system allows to evaluate the failure of the maJor components of the book sterilizer and predict the remaining life for predictive maintenance.
EGR cooler로 유입되는 냉각수 온도의 변화에 따른 NOx 및 PM의 배출 특성에 관한 실험적 연구
공호정(Hojeong Gong),황인구(In Goo Hwang),박심수(Simsoo Park),장용수(Yongsoo Jang),임창식(Changsik Lim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Diesel engine has advantages in point of carbon dioxide reduction than gasoline engine. But NOx emitted from diesel engine is still an important issue, Cooled EGR System is widely used in diesel engine for reducing NOx, As EGR rate is incresed, combustion stability was worse and PM level was increased. So it is important to determine optimal control point of EGR rate. In this research, NOx and PM emission was analyzed with various coolant temperature supplied to the EGR cooler at several positions such as downstream of turbocharger and upstream and downstream of DPF. And CO₂ was measured in exhaust pipe and intake manifold to calculate EGR rate at each engine operating condition. Also combustion analysis was performed in each engine operating condition.
알루미늄 다이캐스팅 EGR Cooler의 열유동 특성 평가
황재순(Jaesoon Hwang),허형석(Hyungseok Heo),이헌균(Heonkyun Lee),배석정(Sukjung Bae),이춘범(Chunbeom Lee),임창식(Changsik Lim),장용수(Yongsoo Jang) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Cooled EGR is an effective method for the reduction of NOx from a diesel engine. EGR cooler is the key component of the EGR system. Recently, high efficiency, high performance and compactness are required for the EGR cooler to meet the Euro-5 emission regulation. Besides, the cutdown of the price of EGR cooler is highlighted. Until now, most of EGR cooler are shell and tube type heat exchangers made of stainless steel. This study investigates the heat transfer performance characteristics according to the design modification of low-cost ALDC(aluminum die-casting) EGR cooler in the same volume basis, whose basic model consists of laminated tubes with rectangular cross section and flow pattern is U-flow.
LP EGR Cooler의 튜브 형상에 따른 열유동 성능 평가
황재순(Jaesoon Hwang),허형석(Hyungseok Heo),이헌균(Heonkyun Lee),이동혁(Donghyeok Lee),배석정(Sukjung Bae),정영대(Youngdae Choung),장용수(Yongsoo Jang) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Recently, high efficiency, high performance and compactness are required for the EGR cooler to meet the Euro-5 emission regulation. This study aimed to CFD analysis for design of LP EGR cooler which is key components of dual loop EGR system. For the design of EGR cooler, the heat transfer performance characteristics of single tube according to various design parameters are analyzed and compared. LP EGR cooler which is piled up tubes is simulated in the same volume basis.