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R & D of Global Multimedia Mobile Satellite Communications on NeLS Project
Ohkawa, Mitsugu,Koyama, Yoshisada,Motoyoshi, Shigeru,Watanabe, Hiroshi,Morikawa, Eihisa,Suzuki, Ryutaro,Yasuda, Yasuhiko 통신위성우주산업연구회 2002 Joint Conference on Satellite Communications Vol.2002 No.-
Next-generation LEO System Research Center (NeLS) has carried out the key technology development of global multimedia mobile satellite communications. In Phase I we studied the system definition and developed key technologies such as on-board active phased array antenna with digital beam forming, optical antenna, optical modem, wavelength division multiplexing for optical inter-satellite link system, satellite network, and variable rate modulation. In Phase 2, we plan to verify the developed technology in Phase 1 on space. In this paper, we introduce the results of development in Phase 1.
착상에 의한 휜관형 열교환기의 성능변화에 관한 실험적 연구
김정국(Jungkuk Kim),小山繁(Shigeru Koyama),桑原憲(Ken Kuwahara),박병덕(Byung-Duck Park),김동휘(Dong-Hwi Kim),사용철(Yang-Cheal Sa) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.2
The present study was investigates the effect of the parameters on the frost formation and heat transfer performance such as fin shape, air temperature and air velocity. Heat transfer rate and pressure drop by frost were experimentally investigated. Effect of the wet blub temperature and air velocity on the heat transfer performance has been also investigated. The heat transfer performance of the louver fin and tube type heat exchanger was higher by maximum of 0.85% than the corrugate fin type at the air temperature of 2.0/1.5℃. As the wet blub temperature of air were increased, the heat transfer rate, pressure drop and mass of frost of three test models were increased. Especially, the maximum heat transfer rate and maximum pressure drop were shown for the Type B louver fin heat exchanger. As an experimental result, the enhancement factor(EF) of louver fin and tube type heat exchanger was only 0.2 - 0.4 due to the high pressure drop.