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

  • 제25권11호
  • /
  • Pages.1492-1499
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  • 2001
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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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극세관 헬리컬 코일형 열교환기에 관한 연구

A Study on the Helically Coiled Heat Exchanger of Small Diameter Tubes

  • Kim, Ju-Won (Dept.of Mechanical Engineering, Graduate School of Pukyong National University) ;
  • Kim, Jeong-Hun (Engineering Research Center, Pukyong National University) ;
  • Kim, Jong-Su
  • 발행 : 2001.11.01
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초록

In order to develop the compact and flexible heat exchangers, we made the helically coiled heat exchangers. They can be manufactured with small diameter copper tubes without the need for fins; inner diameter=1.0 mm, straight tube length=1.5 m. The experiments were carried out with the following conditions; evaporation pressure=0.6 MPa, air velocity=0.7 ∼ 1.7 m/s, and working fluid=R-22. Pressure drop and heat transfer coefficient of heat exchangers were experimented according to the air velocity. The results of heat transfer coefficient show a 35% beneficial increase fur these heat exchangers over the other covered fin-tube heat exchangers. A cooling capacity of about 3 kW was obtained with an air velocity of 1.5 m/s. The distribution header has also been designed fur efficient distribution of refrigerant flow.

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참고문헌

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