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금속박판 접합용 고분자화합물시트를 이용한 박형 히트파이프 내압성 및 유효열전도율 평가에 관한 연구
유병석 ( Byeong-seok Yu ),김정훈 ( Jeong-hun Kim ),김동규 ( Dong-gyu Kim ) 한국산업융합학회 2021 한국산업융합학회 논문집 Vol.24 No.4
In this study, a pressure vessel for a heat pipe was fabricated by bonding a metal thin film using a polymer compound sheet. In order to confirm the applicability of the experimentally manufactured copper material thin heat pipe of 0.6 mm or less, the pressure resistance and effective thermal conductivity for pressure generated according to the type of the working fluid of the heat pipe were evaluated to suggest the commercialization potential of the thin heat pipe. As a result of evaluating the pressure resistance and effective thermal conductivity performance of the thin heat pipe, the following conclusions were drawn. 1) Using a PEEK-based polymer compound sheet, it was possible to fabricate a pressure vessel for a thin heat pipe with a pressure resistance of up to 1.0 MPa by bonding a copper thin film, and the possibility of commercialization was confirmed at a temperature below 120 ℃. 2) In the case of the effective thermal conductivity performance evaluation test, the effective thermal conductivity of ethanol was higher than that of FC72 and Novec7000, and in the case of ethanol, the maximum effective thermal conductivity was 2,851 W/mK at 3.0 W of heating.
파력발전기 지지구조의 강도평가 및 형상 Guideline 제시
정한별(Han Byeol Jeong),김대현(Dae Hyeon Kim),오근원(Keun Won Oh),임재한(Jae Han Lim),유병석(Byeong Seok Yu),홍기용(Key Yong Hong),이강수(Kang Su Lee) 한국해양환경·에너지학회 2016 한국해양환경·에너지학회 학술대회논문집 Vol.2016 No.5
부유식 파력-해상풍력 연계형 발전시스템 중 파력발전기 지지구조물은 설계수명동안 파랑에 의한 압축력, 굽힘하중, 전단력 등의 하중을 받는다. 이는 파력발전기 지지구조물의 최종강도에 영향을 미치게 되며, 한 장소에 장기간 머무는 구조물의 특성상 최종강도를 만족하는 구조물을 설계하는 것은 매우 중요한 요소이다. 본 연구에서는 다양한 형상의 파력발전기 지지구조물에 대해 검토하였으며, 정적해석을 통하여 강도평가를 수행하였다. 더 나아가 파력발전기의 유지보수가 용이한 형상의 파력발전기 지지구조물에 대한 guideline을 제시하고자 한다. Wave Energy Converter(WEC) guide frame, among the wave-offshore wind hybrid power generation system, is pressured by compression, bending and shear load from the waves during its design life. These factors affect the ultimate strength of the WEC guide frame; and considering the nature of a structure which stays in one place for a long time, it is highly significant to design such structure satisfying the characteristics of ultimate strength. This study examined the WEC guide frame in various forms and strength assessment was conducted through linear static analysis. Furthermore, this study proposes a guideline for the WEC guide frame in a form where maintenance work is facile.