• 신재생에너지
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• 제17권1호
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• pp.40-49
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• 2021

In this study, the optical properties, heat transfer capabilities and chemical reaction performance of a methane thermal decomposition reactor using solar heat as a heat source were numerically analyzed on the basis of the cavity shape. The optical properties were analyzed using TracePro, a Monte Carlo ray tracing-based program, and the heat transfer analysis was performed using Fluent, a CFD program. An indirect heating tubular reactor was rotated at a constant speed to prevent damage by the heat source in the solar furnace. The inside of the reactor was filled with a porous catalyst for methane decomposition, and the outside was insulated to reduce heat loss. The performance of the reactor, based on cavity shape, was calculated when solar heat was concentrated on the reactor surface and methane was supplied into the reactor in an environment with a solar irradiance of 700 W/㎡, a wind speed of 1 m/s, and an outdoor temperature of 25℃. Thus, it was confirmed that the heat loss of the full-cavity model decreased to 13% and the methane conversion rate increased by 33.5% when compared to the semi-cavity model.

• 청정기술
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• 제20권4호
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• pp.415-424
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• 2014

본 연구는 전자주개 물질인 phenothiazine 유도체와 전자받개 물질로 quinoxaline 유도체를 Suzuki coupling reaction으로 push-pull 구조의 고분자(PPQX-2hdPTZ (P1), POPQX-2hdPTZ (P2))를 합성하였다. 용해도 향상을 위해 기본 골격에 alkoxy 사슬을 도입하였고, 반응시간을 단축시키고 중합도를 높이기 위해 마이크로웨이브 합성 반응기를 이용하여 중합시켰다. 합성된 고분자는 물리적, 열적, 광학적 및 전기화학적 특성을 확인하였다. 두 고분자의 초기분해온도는 $323-328^{\circ}C$로서 열 안정성이 우수함을 확인하였고, 추가로 alkoxy 사슬을 도입한 P2의 중합도가 더 높았다. 전기화학적 특성을 분석한 결과 두 고분자의 HOMO에너지 레벨은 유사하였다. 합성된 고분자는 ITO/PEDOT:PSS/active layer/$BaF_2$/Al 구조로 소자를 제작하여 유기박막태양전지로의 특성을 확인하였다. 각 소자는 박막의 두께를 다르게 하여 이에 따른 효율의 변화를 확인하였고, 박막의 두께가 얇아질수록 높은 효율을 나타내었다($PCE_{max}:P1=1.0%$, P2 = 1.1%).