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수직형 실린더 내 분리 충전된 이종 PCM의 융해/응고 실험
김경훈(KyoungHun Kim),김형국(Hyungkuk Kim),박천완(ChunWan Park),백종현(JongHyeon Peck),강채동(Chaedong Kang) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
태양열 열원 축열 시스템에서 상 변화물질(PCM)은 열원이용 온도에 따라 종류를 달리할 수 있다. 본 연구에서는 냉난방 겸용 시스템에의 적용을 위해 수직 방향 이중 실린더 내에 충전된 이종 PCM의 융해/응고 실험을 수행하였다. 이종 PCM은 수직 방향의 원형 모듈 안에 분리 충전되어 있고 각각의 PCM 충전부에 열전대를 장착하여 융해/응고 동안 온도를 측정하였다. PCM 각각의 상 변화점은 78 ℃, 27.8℃ 이다. 그 결과, 융해 시 이종 PCM의 상층부부터 원추형으로 융해가 진행되는 것과, 융해/응고 동안 상 변화에 의한 열 전달이 인접한 PCM에 의해 부분 간섭을 받아 진행되는 것이 확인되었다. Phase change material(PCM) in solar heat source heat pump system is changeable to the utilizing temperature of the heat source. In the experiment, melting/solidification of the two PCMs in a vertically cylindrical heat transfer module was investigated whether to use heat pump system. The two PCMs are stored but separated to wall and the temperature of the PCM is measured to thermocouples which are installed to PCM layer. The melting point of PCMs is 27.8℃ and 78 ℃, respectively. To the results, the PCM is conically melted from top of region. Moreover, due to phase change, some interference on heat transfer between the two PCMs is observed during melting/solidification.
Lee, Hye Jin,Seo, Hyun Ook,Kim, Dong Wun,Kim, Kwang-Dae,Luo, Yuan,Lim, Dong Chan,Ju, HyungKuk,Kim, Jin Won,Lee, Jaeyoung,Kim, Young Dok Royal Society of Chemistry 2011 Chemical communications Vol.47 No.19
<P>Novel nanostructured gas filtering systems with TiO<SUB>2</SUB> thin films using atomic layer deposition (ALD) were developed for volatile organic compounds. A superior toluene adsorption efficiency was found for the nanostructured TiO<SUB>2</SUB> thin films.</P> <P>Graphic Abstract</P><P>Atomic layer deposition of TiO<SUB>2</SUB> on AAO produces a highly efficient toluene filter. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1cc10307e'> </P>
Electrocatalytic Reduction of Gas-Phased CO<sub>2</sub> on Nano-Sized Sn Electrode Surface
Lee, Seunghwa,Ju, HyungKuk,Jeon, Hongrae,Machunda, Revocatus L,Kim, Dahee,Lee, Jae Kwang,Lee, Jaeyoung The Electrochemical Society 2013 ECS transactions Vol.53 No.29
<P>Electrochemical conversion of CO<SUB>2 </SUB>(ECC) is one of the promising approaches which may produce alternative organic chemicals such as HCOOH, CH<SUB>3</SUB>OH and C<SUB>2</SUB>H<SUB>4</SUB>. Use of efficient catalysts and systems are necessarily required to obtain high selectivity and high conversion rate. In this study, nano-sized Sn electrocatalyst for producing formic acid is sprayed onto the gas diffusion electrode and a zero-gap electrolytic cell with the membrane electrode assembly is applied. A constant production of formic acid analyzed by UV-spectroscopy is obtained.</P>