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그린리모델링 사례분석을 통한 노후 소규모 건축물의 에너지효율 개선 및 설계기법
김정명(Jungmyung Kim),배민정(Minjung Bae),강재식(Jaesik Kang),권현효(Hyunhyo Kwon) 한국생활환경학회 2021 한국생활환경학회지 Vol.28 No.6
Design guidelines for the Green remodeling project were already been operated by organizations and associations. However, it is difficult to actually apply these design guidelines, if the purpose of the project is to convert old buildings into zero-energy buildings. In this study, the process, design method, and precautions for the Green remodeling project were analyzed and arranged based on the zero energy conversion project by Seoul, which was carried out for two welfare facilities of senior citizens in Seoul.
김정명(Jungmyung Kim),조승환(Seunghwan Cho),김두수(Dusu Kim),박희성(Heesung Park) 대한기계학회 2021 大韓機械學會論文集B Vol.45 No.9
바나듐 산화/환원 유동 전지의 시스템 효율 향상을 위한 나노 유체 전해액의 동점도, 차압 및 전기화학적 특성 정량화에 관한 연구를 수행하였다. 네 가지 나노 입자와 세 가지 유체에 대한 동점도 측정은 이론식과 비교되었으며, 친수성 특성을 가지는 나노 입자의 경우 상대적으로 낮은 함량비에서 기존 유체 대비 동점도 특성이 개선되었다. VRFB 활성 영역으로 사용된 다공체 탄소 펠트에 대한 나노유체의 차압 특성은 나노 입자 함량의 증가에 비례하는 결과를 보였다. 나노 유체 전해액의 전기화학적 성능 측정은 MWCNT 나노 입자에 대하여 수행되었으며, 산화/환원 피크 전류의 경우 양극/음극 전해액 모두에서 입자 함량에 비례하여 증가하였다. 음극 전해액의 경우 나노 입자 함량에 비례하는 가역성을 확인하였다. A study was conducted on the quantification of kinematic viscosity, differential pressure, and electrochemical properties of nanofluid electrolytes to improve the efficiency of the vanadium redox flow cell system. The kinematic viscosity measurements for four nanoparticles and three fluids were compared with the theoretical equations, and the kinematic viscosity characteristics of nanoparticles with hydrophilic properties improved compared to conventional fluids at a relatively low content. The differential pressure characteristics of the nanofluid with respect to the porous carbon felt used as the VRFB active region showed a result proportional to the increase in the nanoparticle content. The electrochemical performance measurement of the nanofluidic electrolyte was performed on MWCNT nanoparticles, and the oxidation/reduction peak current increased in proportion to the particle content in both the anode/cathode electrolyte. In the case of the negative electrolyte, the reversibility was confirmed in proportion to the nanoparticle content.
Experimental Study on Heat Transfer Performance of Microchannel Applied with Manifold
김정명(Jungmyung Kim),장호용(Hoyong Jang),박희성(Heesung Park) Korean Society for Precision Engineering 2022 한국정밀공학회지 Vol.39 No.12
In this paper, theoretical and experimental studies were conducted on the cooling performance of a microchannel heat dissipation device with a manifold layer added. By adding 500 μm wide microchannels and manifold flow fields, the rheological properties of the cooling fluid were enhanced to improve the heat transfer performance. The size of the microchannel used for cooling was 40 × 40 × 5 mm, and was evaluated under a heat flux of 12.5-43.75 W/㎠ and a flow rate of 0.3-1.1 L /min conditions. As a result of the experiment, in the case of a microchannel heat sink of 500 μm compared to the existing heat sink, cooling was successfully performed under a heat flux condition of about four times
바나듐 산화/환원 유동 전지용 양극 전해액의 온도 변화에 따른 전기 화학적 반응 특성
김덕형(Deokhyeong Kim),김정명(Jungmyung Kim),박희성(Heesung Park) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In order to study the lifetime evaluation according to various temperature changes of vanadium redox flow battery, an experiment using cyclic voltammetry was conducted to compare the electrochemical characteristics. In this study, the conduct temperatures were set to -20, 10, 20, and 50℃. Cycles measured in the study were conduct and compared for each scan rate for 4, 100. It can be seen that the electrochemical performance is improved as the performance increases as the temperature and scan rate increase.