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노홍구,이재헌,고철균 대한설비공학회 1999 설비공학 논문집 Vol.11 No.5
Heat dissipation in the domestic switching room has been gradually increased. Therefore, numerical study on the cooling characteristics of the telecommunication system in a switching room for three kinds of the air supply and return flow system was investigated to develop effective flow system. As a result, the cooling performance of the under floor air supply and overhead return flow system was the best.
노홍구,정영숙,Noh, H.K.,Jung, Y.S. 한국전자통신연구원 1998 전자통신동향분석 Vol.13 No.4
점차적으로 고발열화되고 있는 국내 전화국사의 교환기실을 효율적으로 냉각할 수 있는 새로운 국내 교환기실의 급배기 방식의 개발에 이용하고자, 실제 국내 교환기실의 모델을 대상으로 한 수치적인 연구방법으로써 각 급배기 방식에 따른 속도 분포 및 교환기 내의 전자부품 온도 분포 등 각 급배기 방식에 따른 냉각 특성을 조사 비교하였다. 본 연구에서 제시한 결과들은 고발열화되는 국내 교환기실의 새로운 급배기 방식 설정을 결정하기 위해 효과적으로 이용될 수 있을 것이다.
히트 싱크 부착 전자부품을 가진 통신시스템의 냉각성능 연구
노홍구,이재헌,No, Hong-Gu,Lee, Jae-Heon 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.2
A numerical study on the cooling performance for electronic components mounted with heat sink in an electronic system has been performed. The model of electronic system consisted with lower and upper modules in which the electronic components mounted with heat sink were arrayed. To find better configuration under a given fan power for effective cooling, the cases called 'No heat sink','Both heat sinks','Lower heat sinks', and 'Upper heat sinks' were tested. The results showed that the cooling performance in 'Upper heat sinks' was the best among four cases.
노홍구,Noh, H.K. 한국전자통신연구원 1999 전자통신동향분석 Vol.14 No.5
전화국사 내 교환기의 신설이나 증설 시에 최적의 열부하 산정이 필요하다. 이를 위해 전화국사의 특성에 알맞은 열부하 계산 프로그램을 윈도우용으로 개발하여 비전문가들도 쉽게 사용할 수 있도록 하고자 한다. 프로그램 구성은 기본자료입력부, 전화국사의 자료입력부, 입력된 데이터를 이용하여 국사의 냉방부하와 냉방시스템의 용량을 계산하는 부분 그리고 출력부분으로 크게 4부분으로 나눌 수 있다. 본 프로그램을 이용하여 한국통신 중앙전화국 5ESS실의 냉방기기용량을 산정해 본 결과, 기존 냉방기기 69USRT의 49%에 해당되는 33.5USRT로 나타나 기존 냉방기기의 용량이 너무 과다하게 선정되었음이 판명되었다. 본 프로그램은 전화국사의 에너지 절약에 기여할 수 있을 것으로 판단된다.
히트 스프레더가 사용된 노트북 PC의 냉각성능에 관한 수치적 연구
노홍구,임경빈,박만흥,No, Hong-Gu,Im, Gyeong-Bin,Park, Man-Heung 대한기계학회 2001 大韓機械學會論文集B Vol.25 No.6
Parametric study to investigate the cooling performance of a notebook PC mounted with heat spreader has been numerically performed. Two cases of air-blowing and air-exhaust at inlet were tested. The cooling effect on parameters such as, inlet velocities in the cases of air-blowing and air-exhaust, materials of heat spreader, and CPU powers were simulated for two cases. Cooling performance in the case of air-blowing was better than the case of air-exhaust.
다수의 균일발열부품이 접촉된 광대역 회선분배 시스템 냉각용 히트파이프 시스템의 비정상 동작특성에 관한 수치적 연구
노홍구,이재헌,No, Hong-Gu,Lee, Jae-Heon 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.6
A numerical study t predict the characteristics on transient operation of the heat pipe cooling system with multiple heaters for electronic system has been performed. The heat pipe cooling system of 45 cm length and 16 mm diameter was composed of evaporator section with four heaters which simulate electronic components, insulated transport section, and condenser section with a conductor which was cooled under the constant heat flux boundary condition. Two test cases were investigated in present study; Case 1 indicated that the 1st and 2nd heaters among four heaters were heated off, while the 3rd and the 4th heaters were heated on. Case 2 was the inverse situation switched from heating locations of Case 1. Case 3 indicated that the 1st and 4th heaters among four heaters were heated off, while the 2nd and 3rd heaters were heated on. The results showed that the transient time to reach the steady state is shorter for Case 1 than for Case 2. Especially, the maximum temperature among the heaters which simulate electronic components during switching operation is relatively small compared to the maximum allowable operating temperature in electronic system. It is concluded that the heat pipe cooling system in present study operate with the good thermal reliability even for sudden switching situation of the heaters.
DPH(Dual Pack Heater)방식 차량공조장치연구
노홍구(Hongkoo Roh),임경빈(Kyungbin Lim),노종호(Jong-Ho Noh),이영기(Youngki Lee) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The study aims to analyzed and identify the heat transfer characteristics of heating unit for car in order to design DPH. The temperature comparison processes were done with various experimental and numerical study. As results, the optimal conditions of DPH design were proposed as field test in real car, hot air flow, iso-thermal contours.