설비공학논문집 (Korean Journal of Air-Conditioning and Refrigeration Engineering)

  • 제29권8호
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  • Pages.408-418
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  • 2017
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  • 1229-6422(pISSN)
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  • 2465-7611(eISSN)
대한설비공학회 (The Society of Air-Conditioning and Refrigerating Engineers of Korea)
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단일채널 내 임계영역 이산화탄소 가열과정의 열유동 특성에 관한 실험적 연구

Experimental Studies on Thermal-Fluidic Characteristics of Carbon Dioxide During Heating Process in the Near-Critical Region for Single Channel

  • 최현우 (과학기술연합대학원대학교) ;
  • 신정헌 (한국기계연구원 열시스템연구실) ;
  • 최준석 (한국기계연구원 열시스템연구실) ;
  • 윤석호 (과학기술연합대학원대학교)
  • Choi, Hyunwoo (Department of Plant System and Machinery, University of Science and Technology) ;
  • Shin, Jeong-Heon (Department of Thermal Systems, Korea Institute of Machinery and Materials) ;
  • Choi, Jun Seok (Department of Thermal Systems, Korea Institute of Machinery and Materials) ;
  • Yoon, Seok Ho (Department of Plant System and Machinery, University of Science and Technology)
  • 투고 : 2017.02.14
  • 심사 : 2017.05.31
  • 발행 : 2017.08.10
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초록

Supercritical carbon dioxide ($sCO_2$) power system is emerging technology because of its high cycle efficiency and compactness. Meanwhile, PCHE (Printed Circuit Heat Exchanger) is gaining attention in $sCO_2$ power system technology because PCHE with high pressure-resistance and larger heat transfer surface per unit volume is fundamentally needed. Thermo-fluidic characteristics of $sCO_2$ in the micro channel of PCHE should be investigated. In this study, heat transfer characteristics of $sCO_2$ of various inlet conditions and cross-sectional shapes of single micro channel were investigated experimentally. Experiment was conducted at supercritical state of higher than critical temperature and pressure. Test sections were made of copper and hydraulic diameter was 1 mm. Convective heat transfer coefficients were measured according to each interval of the channel and pressure drop was also measured. Convective heat transfer coefficients from experimental data were compared with existing correlation. In this study, using measured data, a new empirical correlation to predict near critical region heat transfer coefficient is developed and suggested. Test results of single channel will be used for design of PCHE.

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참고문헌

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