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트리아진 코어를 지니는 초분자 고분자의 광화학적 상전이 거동
오승환(Seungwhan Oh),Yashwardhan R. Malpani,정영식(Young-Sik Jung),김종만(Jong-Man Kim) 한국고분자학회 2016 폴리머 Vol.40 No.4
트리아진(triazine) 코어를 중심으로 아조벤젠을 말단기로 갖는 광 감응성 화합물을 합성하고, 초분자 구조체를 제조하여 용매에 따른 구조적 특성을 조사하였다. 트리아진 유도체 N2,N4,N6-tris(4-((E)-phenyldiazenyl) phenyl)-1,3,5-triazine-2,4,6-tricarboxamide(Azo-TA)를 디메틸설폭사이드와 디메틸포름아마이드 용매에 녹인 후, 증류수를 첨가해 섬유상의 초분자 고분자구조체를 만들었다. 아조벤젠의 광이성질화에 의해, 365 nm 파장의 자외선을 조사하면 초분자 구조의 분해가 일어나고, 400 nm 파장 이상의 가시광선을 조사하면 초분자 구조의 재조립이 일어나는 것을 확인하였다. A photoresponsive azobenzene derivative having a triazine core moiety was prepared. Self-assembly of the triazine containing azobenzene derivative (Azo-TA) in aqueous dimethylsulfoxide and N,N-dimethylformamide afforded fibrous supramolecular polymers. Melting and regeneration of the supramolecular polymer were observed with alternative 365 nm UV and visible light irradiation by reversible cis-trans isomerization of azobenzene moieties.
R600a를 이용한 소형 멀티형 냉장고 시스템의 성능특성에 대한 실험적 연구
안지훈(Jihoon Ahn),장용희(Yonghee Jang),김용찬(Yongchan Kim),최원섭(Wonseop Choi),오승환(Seungwhan Oh),김창년(Changnyeun Kim),이재승(Jaeseung Lee) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.4
Various types of refrigerators become popular in the market such as a common refrigerator, kimchi refrigerator and wine cellar. It is required to develop a multi type refrigerator combining these refrigerators to save space and energy consumption. In this study. the performance of a multi type refrigerator, which consists of one machine room and three evaporators, was measured in a bench type multi refrigerator. The multi type refrigerator was tested by varying the number of refrigerator cabinet, refrigerant charge, and temperature conditions. In addition, the multi type refrigerator with a suction line heat exchanger(SLHX) was tested to improve system performance. Based on the experimental data, the multi type refrigerator showed better performance than the conventional refrigerator (single type system). Besides. the COP of the single system increased from 1.0 to 1.37, and those of the dual and triple system increased from 1.29 to 1.39, and 1.22 to 1.51, respectively, by applying the SLHX.