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연료전지 분리판의 리브 높이 변화에 따른 응답성 변화에 관한 실험적 연구
윤성호(Sungho Yun),최남현(Namhyeon Choi),남기훈(Kihoon Nam),이장일(Jangil Lee),최영돈(Youngdon Choi) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.6
In the present study, using a variation of rib height, the transient response and the performance are investigated. The cell voltage is acquired according to the current density change(0.8A/cm2 to 1.0A/cm2) under same stoichiometry and relative humidity. The different level of undershoots appeared at the different clamping pressure(1.5MPa and 2.0MPa) and different rib height. At 1.5MPa clamping pressure, rib manufactured cutting 100μm height goes to steady state faster than reference plate and has lower maximum undershoot voltage. But performance is lower than reference plate due to increasing contact resistance.
외기온도 변화에 따른 집단에너지 다중 열공급 최적제어 알고리즘 개발에 관한 수치해석적 연구
변재기(Jaeki Byun),최남현(Namhyeon Choi),남기훈(Kihoon Nam),최영돈(Youngdon Choi),신종근(Jongkeun Shin) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
In the present study, we developed optimal heat supply algorithm which minimize the heat loss through the distribution pipe line in group energy apartment. Heating load variation of group energy apartment building in accordance with outdoor air temperature was predicted by the correlation obtained from calorimeter measurements of whole households of apartment building. Supply water temperature and mass flow rate were conjugately controlled to minimize the heat loss rate through distribution pipe line. Group heating apartment located in Hwaseong city, Korea, which has 1,473 households devided in 4 regions, was selected as the object apartment for verifing the present heat supply control algorithm. Compared to the original heat supply system, 10.4% heat loss rate reduction can be accomplished by employing the present control algorithm.