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에너지 구조재 적용을 위한 알루미늄/섬유강화 복합재의 표면처리
이경엽(K. Y. Rhee),강용태(Y. T. Kang),양준호(J. H. Yang) 한국표면공학회 2001 한국표면공학회지 Vol.34 No.1
In this work, the surface treatment of aluminum/composites (graphite-epoxy composites) was investigated. The surface of composites was treated by Ar? ion beam under oxygen environment. The surface of aluminum was treated by DC plasma. The optimal condition of surface treatment for the composites was determined by measuring the contact angle as a function of ion dose. The optimal treament condition of the aluminum was determined by measuring the contact angle and T-peel strength as a function of mixture ratio of acetylene gas to nitrogen gas. The mixture ratios used were 1:9, 3:7, 5:5, 7:3, and 9:1 The results showed that the contact angle of composites decreased from 81° to 8° as the ion dose increased from zero to 1×10¹? ion/㎠. The optimal condition of ion dose was 1×10¹?ions/㎠. The results also showed that the contact angle of aluminum was a minimum for the mixture ratio of 5:5. Similarly, the T-peel strength was a maximum for the mixture ratio of 5:5, which indicates that the optimal condition of mixture ratio of acetylene gas to nitrogen gas is 5:5.
태양열에 의한 냉방 및 난방시스템의 성능향상(I) - TRNSYS에 의한 동직열부하 계산과 태양열 시스템의 최적화 -
강용태,김효경,노승탁,Kang, Y.T.,Kim, H.K.,Ro, S.T. 대한설비공학회 1988 설비저널 Vol.17 No.6
This study simulates a typical solar system using the transient simulation program TRNSYS, and calculates the maximum cooling load of the model room of $50m^2$. In this study, energy rate control method is used in calculating a maximum cooling load. On the ground of the maximum cooling load of the model room, the variables that have an effect on the solar collection performance of the solar system are made a selection. Also in this study the trend of the solar collection performance is shown as the variables change. The results show that the variables which have an effect on the collection performance are collector area, collector mass flow rate, collector slope and the volume of storage tank, and the optimal value of Ac/Vt is not constant but varies as the collector area and the collector mass flow rate. Also the results show that for cooling system the optimal value of the collector slope is latitude minus $15^{\circ}$ during the seasonal operations, and twenty percent of the maximum cooling load is saved with the aid of the solar energy.