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

  • 제17권1호
  • /
  • Pages.1-7
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  • 2005
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  • 1229-6422(pISSN)
  • /
  • 2465-7611(eISSN)
대한설비공학회 (The Society of Air-Conditioning and Refrigerating Engineers of Korea)
권호 표지

Hardy-Cross법을 이용한 $CO_2$ 냉동기용 내부열교환기의 열전달 특성 연구

Analysis of Heat Transfer Characteristics of Internal Heat Exchanger for $CO_2$ Refrigerator using the Hardy-Cross Method

  • 강희동 (인하대학교 기계공학과 대학원) ;
  • 김욱중 (한국기계연구원 열유체공정기술연구부) ;
  • 서태범 (인하대학교 기계공학과)
  • Kang Hee-Dong (The Graduate School of Department of Mechanical Engineering, Inha University) ;
  • Kim Ook Joong (Thermo-fluid Department, Korea Institute of Machinary & Materials) ;
  • Seo Tae-Beom (Department of Mechanical Engineering, Inha University)
  • 발행 : 2005.01.01
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초록

The heat transfer characteristics of an internal heat exchanger for $CO_2$ refrigeration cycle are numerically investigated. The numerical model is verified using the published experimental results for the concentric tube type internal heat exchanger. The Hardy-Cross Method gives very good agreement between the calculation and experimental results on the heat transfer rates and exit temperatures. Also, appropriate combination of heat transfer correlations is found. The operating parameters of the heat exchanger are calculated at transcritical region of $CO_2.$ The heat transfer rate of the counter flow type heat exchanger shows the $32\%$ greater than that of the parallel flow type heat exchanger. The increase of heat exchanger length enhances the heat transfer rate. The thermodynamic characteristics and heat transfer coefficient of $CO_2$ in the internal heat exchanger are estimated.

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참고문헌

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