대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제39권10호
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  • Pages.779-786
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  • 2015
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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초임계 이산화탄소를 작동유체로 한 PCHE의 열수력 성능 향상을 위한 수치해석적 연구

A Numerical Study on Improving the Thermal Hydraulic Performance of Printed Circuit Heat Exchanger Using the Supercritical Carbon Dioxide

  • 투고 : 2015.02.13
  • 심사 : 2015.07.29
  • 발행 : 2015.10.01
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초록

이 연구의 목적은 열수력 성능을 향상시키기 위하여 PCHE의 새로운 유로 형상을 제안하는 것이다. 기존의 Zigzag 유로는 굽힘점에서 유동 박리와 역류 영역의 발생으로 높은 압력손실을 가지고 있다. 이 단점을 개선하기 위하여 굽힘점에 직관영역을 삽입하였다. 또한 직관의 길이 변화가 열전달 및 압력손실에 미치는 영향을 분석하였다. 새로운 형상과 기존 Zigzag 유로의 열수력 성능을 Goodness Factor를 사용하여 정량적으로 비교하였다. 질량유량은 $1.41{\times}10^{-4}$에서 $2.48{\times}10^{-4}kg/s$까지 변화 하였다. 1mm 직관길이에서 평균 Goodness Factor는 Zigzag보다 약 25% 정도 증가되었다.

The objective of this study is to propose a new channel shape that improves thermal-hydraulic performance. The existing Zigzag channel has high pressure loss due to flow separation and reverse flow. To improve this disadvantage, partial straight channel is inserted into bended points. Also, the effects of straight channel's length change on heat transfer and pressure loss are analyzed. Thermal-hydraulic performance of the new shape and existing Zigzag channel are quantitatively compared in terms of Goodness Factor. Mass flow rate was changed from $1.41{\times}10^{-4}$ to $2.48{\times}10^{-4}kg/s$. The average volume goodness factor of 1mm straight channel shape was increased by 25% compared to the Zigzag channel.

키워드

참고문헌

  1. Ishizuka, T., Kato, Y., Muto, Y., Nikitin, K. and Ngo, T. L., 2006, "Thermal-Hydraulic Characteristics of a Printed Circuit Heat Exchanger in a Supercritical $CO_2$ Loop," NUCL. REACTOR, Vol. 30, pp. 109-116.
  2. Ngo, T. L., Kato, Y., Nikitin, K. and Ishizuka, T., 2007, "Heat Transfer and Pressure Drop Correlations of Micro channel Heat Exchangers with S-shaped and Zigzag Fins for Carbon Dioxide Cycles," Experimental Thermal and Fluid Science, Vol. 32, pp. 560-570. https://doi.org/10.1016/j.expthermflusci.2007.06.006
  3. Kwon, O. K., Choi, M. J. and Choi, Y. J., 2009," Heat Transfer and Pressure Drop Characteristics in Zigzag Channel Angles of Printed Circuit Heat Exchangers" Trans. Korean Soc. Mech. Eng. B, pp.1147-1152.
  4. Kim, D. E., Kim, M. H., Cha, J. E. and Kim, S.O., 2008. "Numerical Investigation on Thermal-Hydraulic Performance of New Printed Circuit Heat Exchanger Model," Nuclear Engineering and Design, 238 pp. 3269-3276. https://doi.org/10.1016/j.nucengdes.2008.08.002
  5. Lee, S. M. and Kim, K. Y., 2011 "Parametric Study on Fluid Flow and Heat Transfer in a Printed Circuit Heat Exchanger," ASME/JSME 2011 8th Thermal Engineering Joint Conference.
  6. Lee, S. M. and Kim, K. Y., 2013 Comparative Study on Performance of a Zigzag Printed Circuit Heat Exchanger with Various Channel Shapes and Configurations," Heat Mass Transfer DOI 10.1007/s00231-013-1149-4.
  7. Kim, Y. H., 2009 "Heat Transfer and Fluid Flow Characteristics on Printed Circuit Heat Exchangers with Microchannel Configurations," Dortor degre thesis Korea University.
  8. SHAH, R. K. and Sekulic, D. P., "Fundamentals of Heat Exchanger Design."