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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.
연료별 자동차의 주행모드 조건에 따른 연비 및 배출가스 특성 평가
강은정(Eunjeong Kang),전문수(Mun Soo Chon),엄준식(Junsik Um),김경훈(Kyounghun Kim),서영호(Youngho Seo) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
Currently the vehicle exhaust gas regulation has been strengthened, Research to improve the exhaust gas after-treatment device development technology and the exhaust performance of the vehicle is making efforts In order to satisfy the regulatory. The purpose of this study is analysis to Characteristics evaluation of fuel economy and emission according to driving mode conditions of The vehicle by fuel type. The test vehicles were selected by each of the fuel according to the difference in displacement volume. These were used four representative mode(FTP-75, NEDC, US06 and SC03) in order to evaluation fuel economy and emission gas. Domestic certification emissions measurement test mode was conduct after the vehicle was soaking for a long time. It is standard condition. Additionally, the test conditions were carried out for warm-up air conditioner condition. Warm-up air conditioner condition was performed the test while it is running the air conditioner after the engine fully warmed up.