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데이터센터 상구조 하부 격벽구조에 따른 서버랙 냉기류유입 영향성에 대한 수치해석 연구
양성진(Sungjin Yang),신용우(Yongwoo Shin),김주한(Joo Han Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.8
As the introduction of high-performance IT equipment is gradually increasing, the amount of power required is also continuously increasing. Since server equipment needs to be operated continuously without any rest, heat management is essential for stable operation. Accordingly, air conditioning technology is strongly emphasized. Various studies have been conducted to analyze the air conditioning characteristics through the ASHRAE performance index based on the spatial structure arrangement and specifications of the server rack located above base floor. On the other hand, research on the air conditioning characteristics related to the spatial structure underfloor structure have been relatively insignificant. In this study, the underfloor partition wall structure of the data center with air distribution system as type of server rack front intake and rear exhaust structure including CRAH has been changed. According to the change, the temperature distribution characteristics of the cold air entering the server rack under the heat load of 2.68kW/Rack were numerically analyzed.
철도터널 화재시 연결통로 및 대피로 제연을 위한 수치해석 연구
양성진(Sungjin Yang),허남건(Nahmkeon Hur),유홍선(Hong Sun Ryou),김동현(Dong Hyeon Kim),장용준(Yong Jun Jang) 대한설비공학회 2008 설비공학 논문집 Vol.20 No.1
A transient 3-D numerical simulation was performed to analyze the fire safety in a railway tunnel equipped with a mechanical ventilation system. The behavior of pollutants was studied for the emergency operation mode of ventilation system in case of fire in the center of the rescue station and near the escape route. Various schemes of escape route construction for connection angle<45°, 90°, 135°) and sloper(10°) were evaluated for the ventilation efficiency in the fire near the escape route. From the results, it was shown that the mode of the ventilation fan operation which pressurizes the tunnel not under the fire and ventilates the smoke from the tunnel under the fire is most effective for the smoke control in the tunnel in case of the fire occurrence. It was also shown that the blowing of jet fan from the rescue tunnel to the main tunnel should be in the same direction as the flow direction in the main tunnel arising from the traffic and the buoyancy.
양성진(Yang, Sungjin),서정무(Seo, Jung-Moo) 대한전기학회 2023 전기의 세계 Vol.72 No.8
본 고에서는 전동기에 사용되는 냉각 방식의 종류와 특징을 분석하고, 각 방식이 지니는 특장점과 적용 사례를 제시하고자 한다. 먼저 전동기의 주요 열원과 열 특성 분석기법을 소개하였으며 견인 및 추진 전동기에 대한 최근 개발된 열관리 기술 동향과 개발 사례를 검토하였다. 더불어, 산업용 전동기의 방열구조에 대한 소개와 함께 향후 열관리 영역에서 나아가야 할 시 사점을 끝으로 글을 마무리하였다. In this paper, we analyzed the types and characteristics of cooling methods used in motors and presented the characteristics and application examples of each cooling method. First, the primary heat source of the motor and the thermal characteristic analysis method were introduced, and the recently developed thermal management technology trends and development cases for traction and propulsion motors were reviewed. In addition, the article concluded with an introduction to the heat dissipation structure of industrial motors and the implications of moving forward in the field of thermal management in the future.