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

  • 제12권10호
  • /
  • Pages.932-940
  • /
  • 2000
  • /
  • 1229-6422(pISSN)
  • /
  • 2465-7611(eISSN)
대한설비공학회 (The Society of Air-Conditioning and Refrigerating Engineers of Korea)
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마이크로핀관의 확관 전후 증발열전달 특성에 관한 실험적 연구

An Experimental Study on Evaporative Heat Transfer Characteristics in Micro-Fin Tubes Before and After Expansion Process

  • 전상희 (서울대학교 기계항공공학부) ;
  • 황윤욱 (서울대학교 기계항공공학부) ;
  • 윤석호 (서울대학교 기계항공공학부) ;
  • 김민수 (서울대학교 기계항공공학부)
  • 발행 : 2000.10.01
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초록

An experimental study on evaporative heat transfer characteristics in micro-fin tubes before and after expansion process has been performed with R-22. Single-grooved micro-fin tubes with outer diameter of 9.52 mm were used as test sections, and it was uniformly heated by applying direct current to the test tubes. Experiments were conducted at mass flow rates of 20 and 30 kg/hr. For each mass flow rate condition, evaporation temperature was set at 5 and $15^{\circ}C$and heat flux was changed from 6 to 11 kW/$m^2$ The evaporative heat transfer coefficient of micro-fin tubes after expansion is decreased because of the crush of fins and enlargement of inner diameter compared to that before expansion. Convective boiling effect decreased remarkably at higher quality range in the micro-fin tube after expansion, and the difference of the heat transfer coefficient in micro-fin tubes before and after expansion was greater for higher quality region. The evaporative heat transfer coefficient of the micro-fin tube after expansion was 19.9% smaller on the average than that before expansion.

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참고문헌

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