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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Influence of NCG Charging Mass on the Heat Transport Capacity of Variable Conductance Heat Pipe

불응축가스량이 가변전열 히트파이프의 열수송 특성에 미치는 영향

  • Suh Jeong-Se (School of Mechanical & Aerospace Engineering & ReCAPT, Gyeongsang National Univ.) ;
  • Park Young-Sik (Department of Car-Electronics, Changwon Polytechnic College) ;
  • Chung Kyung-Taek (Department of Mechanical Engineering, Gyeongsang National Univ.)
  • 서정세 (경상대학교 기계항공공학부 항공기부품기술연구소) ;
  • 박영식 (창원기능대학 카일렉트로닉스과) ;
  • 정경택 (경상대학교 대학원 기계공학과)
  • Published : 2006.04.01
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Abstract

Numerical analysis and experimental study are performed to investigate the effect of heat load and operating temperature on the thermal performance of several variable conductance heat pipe (VCHP) with screen meshed wick. The heat pipe is designed in 200 screen meshes, 500 mm length and 12.7 mm outer diameter tube of copper, water (4.8 g) is used as working fluid and nitrogen as non-condensible gas (NCG). Heat pipe used in this study has evaporator, condenser and adiabatic section, respectively. Analysis values and experimental data of wall temperature distribution along axial length are presented for heat transport capacity, condenser cooling water temperature change, degrees of an inclination angle and operating temperature. These analysis and experiment give the follow findings: For the same charging mass of working fluid, the operating temperature of heat pipe becomes to be high with the increasing of charging mass of NCG. When the heat flux at the evaporator section increases, the vapor pressure in the pipe rises and consequently compresses the NCG to the condenser end part and increases the active length of the condenser. From previous process, it is found out we can control the operating temperature effectively and also the analysis and experimental results are relatively coincided well.

Keywords

References

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