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모바일 전자장비 냉각을 위한 micro-CPL의 열성능 해석
배찬효(C.H. Bae),김병기(B.G. Kim),서정세(J.S. Suh),황건(G. Hwang),문석환(S.H. Moon) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
As more high power wide band gap devices are being utilized, the thermal management issues associated with these devices need to be resolved. High power small devices dissipate excessive heat that must be cooled, but traditional cooling methods are insufficient to provide such a cooling means. This paper will evaluate a micro-capillary pumped loop thermal management system that is incorporated into the shim of the device, taking advantage of phase-change to increase the thermal conductivity of the system. The results of the modeling of the thermal management system will be discussed.
그루브 히트파이프형 이중진공관 태양열 집열기 시스템의 성능 예측
배찬효(C.H. Bae),강창호(C.H. Kang),홍정규(J.K. Hong),정경택(K.T. Chung),서정세(J.S. Suh) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In the present study, Axially Grooved Heat Pipe Type Solar Collector using a Glass Concentric Evacuated Tube was investigated experimentally under the field conditions of Jinju, Korea. The mathematical models of two-phase flow in grooved heat pipe are presented for the capillary limitation in steady state. Experimental study has been carried out to find out thermal characteristics of grooved heat pipe applied to the solar collectors. The experimental result shows that the heat transfer performance of heat pipe is improved with increasing the heat input and coolant temperature. Also that has been accomplished to find out thermal characteristics of grooved heat pipe applied to the solar collectors. This paper is to analyze thermal performance data and simulation modeling for the rating of SDHWS using TRANSYS.
하절기 태양열 시스템 적용을 위한 이중진공관 히트파이프형 집열기 열성능의 실험적 연구
강창호(C.H. Kang),배찬효(C.H. Bae),홍정규(J.K. Hong),서정세(J.S. Suh) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
This paper has been carried out to find the thermal efficiency and operating characteristics of heat pipe type solar collector using a glass concentric evacuated tube(CETC) during summer. In an experiment the flow rate of water in collector are 1.5l/min. Collector efficiency is 50∼60% during time. The solar radiation appeared in a clear day is efficiency high. Efficiency curve fitted first order polynomial show that FR (τα ) and FRUL=1.316 is 0.601 and 1.316 respectively.
태양열 집열용 써모사이폰의 Geyser boiling에 대한 실험적 연구
홍정규(J.K. Hong),배찬효(C.H. Bae),정경택(K.T. Chung),서정세(J.S. Suh) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
This study has been carried out to investigate thermosyphon's geyser boiling phenomenon used to solar collector. evaporator section of thermosyphon used to solar collector is very much longer than that of condenser section. From the results from this study, Geyser boiling's cycle depends on cooling water, tilt angle and the applied heat load at the evaporator. In this study, according to heat load, the geyser boiling frequency is lower, but the amplitude higher. For the high tilt angle of heat pipe, the frequency and amplitude are lower and higher in the evaporator region, respectively. Whereas, these phenomena is in contrast in the condenser region.
태양열 집열기용 히트파이프 작동유체의 충진량 변화에 따른 열특성의 실험적 연구
정경택(K.T. Chung),배찬효(C.H. Bae),김병기(B.G. Kim),서정세(J.S. Suh) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
This experiment is performed to investigate the optimal charging quantity of working fluid of heat pipe with grooved wick in solar collector. The shape of groove is rectangle. The heat pipe used in solar collector is longer than any other heat pipe. So, the charging quantity of working fluid is very important factor to improve the performance. Working fluid of heat pipe is charged 9 ㏄ and 15 ㏄, respectively. these heat pipe are tested a㏄ording to various heat input, inclination angle and coolant temperature. At a result, With various charging quantity, We could estimate the influence of working fluid of heat pipe in solar collector and also find out the optimal charging quantity of working fluid.
조종래(J.R. Cho),권정헌(J.H Kwon),김창수(C.S. Kim),배찬효(C.H. Bae),김현준(H.J. Kim) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
The purpose of this study is to evaluate the integrity of combined LNG vaporizer. The combined LNG vaporizer is used to transfer the liquified natural gas which temperature is -160℃ and supplied pressure on LNG vaporization mode is 4bar(0.4㎫). In the present work the temperature distribution and thermal stress are calculated by the finite element method. A commercial software(ANSYS 11.0) is used in the structural analysis for combined LNG vaporizer. In design condition, calculated membrane and membrane plus bending stress are lower than allowable stresses based on the ASME boiler and pressure vessel code. In operating condition the results are satisfied with the code limits.