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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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An Experimental Study on Heat Transfer and Pressure Drop Characteristics during Supercritical Process of Carbon Dioxide in a Horizontal Tube

수평관 내에서 이산화탄소 초임계 가스냉각 과정의 열전달 및 압력강하 특성에 관한 실험적 연구

  • 최이철 (국민대학교 대학원) ;
  • 강병하 (국민대학교 기계ㆍ자동차공학) ;
  • 김석현 (국민대학교 기계ㆍ자동차공학부)
  • Published : 2004.05.01
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Abstract

The heat transfer and pressure drop characteristics associated with the gas cooling of the supercritical carbon dioxide in a horizontal tube have been investigated experimentally. This problem is of particular interest in the design of a gas cooler of cooling systems using $CO_2$refrigerant. The test section is consisted of 6 series of 455 mm in length, 4.15 mm ID copper tube, respectively. The effects of the inlet temperature, pressure and mass flow rate on the heat transfer and pressure drop of $CO_2$in a horizontal tube is studied in detail. The heat transfer coefficient of $CO_2$is varied by temperature, inlet pressure, and mass flow rate of $CO_2$. This has maximum value at near the pseudocritical temperature. The pressure drop is changed by inlet pressure and mass flow rate of $CO_2$. The results have been compared with those of previous work. The heat transfer correlation at the supercritical gas cooling process is also suggested.

Keywords

References

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