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박동삼(D. S. Park),성은제(E. J. Seong),한진용(J. Y. Han),황상순(S. S. Hwang) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
In this study, introduce about processing method of microchannel in fuel processor. For the comparison of heat transfer performance of methanol evaporator, numerical analysis using FLUENT code was carried out. Channel shape and condition which could determine the heat transfer performance according to the channel conditions were obtained. For channel forming, besides the conventional etching method, mechanical machining methods of end milling and powder blasting was introduced. It was shown that end mining could reduce machining error remarkably and surface treatment by powder blasting could improve the performance of catalyst coating.
박동성(D.-S. Park),주재준(J.-J. Joo),문경모(K.-M. Moon),장용복(Y.-B. Chang),박영민(Y.-M. Park),김남원(N.-W. Kim),이현정(H.-J. Lee),곽상우(S.-W. Kwag),송낙형(N.-H. Song),우인식(I.-S. Woo),양형렬(H.-L. Yang) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Korea Superconducting Tokamak Advanced Research (KSTAR) was constructed for Korean fusion research and has been operated successfully since 2008. Different from other tokamak devices, KSTAR is fully superconducting (SC) magnet tokamak which consists of 30 magnets and is made of Nb₃Sn and NbTi superconductor. To reach appropriate operating condition of the KSTAR SC magnets, the magnets temperature should be cooled down to liquid helium temperature. A Helium Refrigeration System(HRS) with an exegetic equivalent cooling power of 9㎾ at 4.5K is dedicated to cool down and keep the KSTAR SC magnets in cryogenic temperature. Since the commissioning period and the first campaign of KSTAR, the HRS has showed sufficient performance for the KSTAR SC magnets operation. The estimated time of cool-down for KSTAR cold components was 30 days, but the KSTAR SC magnets were reached to cryogenic temperature in 23 days at the first cool-down operation. Due to the long period of the KSTAR campaign, the reliable operation of the HRS is as important as its performance. During the past 4 years of campaign, the abnormal events were occurred several times and they were influenced to the reliability of the KSTAR HRS and the system availability was decreased. This paper will present the operation result of the KSTAR HRS since the first campaign and the record of the abnormal events and reliability will be discussed.