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2단압축 상분리 사이클을 적용한 이산화탄소 시스템의성능향상에 관한 해석적 연구
류창기,이호성,김용찬,조홍현,조성욱 대한설비공학회 2006 설비공학 논문집 Vol.18 No.8
In this study, a two-stage phase-separate cycle was investigated analytically to improve the performance of the CO2 system in the cooling mode. The simulation results were verified with the measured data. The predictions using the simulation model were consistent with the measured data within ±20% deviations. The performance of the modified CO2 system with the two-stage phase-separated cycle was analyzed with the variations of outdoor temperature and EEV opening. The cooling COP decreased with the increase of compressor frequency. The highest COP was 2.7 at compressor frequencies of 30Hz and 30Hz for the first and second compressors, respectively. In addition, the cooling COP increased by 9.3% with an application of optimum control of the first and second-stage EEV openings.
부분 탄성기초를 갖고 종동력을 받는 보의 플러터 불안정
류봉조,류시웅,조창기,이종원 한밭대학교 생산융합기술연구소 2004 생산기반기술연구소 논문집 Vol.4 No.1
In this paper, the dynamic stability of a cantilevered beam partially attached to elastic foundations and subjected to a follower force is studied. The beam has a concentrated mass at an arbitrary position on it. Governing equations are derived by extended Hamilton's principle and the finite element formulations are applied to obtain discretized equations. The influence of some parameters, such as the elastic foundation parameter, the position of partial elastic foundations, mass ratios and rotary inertia of the concentrated mass on the critical flutter load is investigated. Finally, the optimal attachment ratio of partial elastic foundation which maximizes the critical flutter load is found.