Mobile QR Code QR CODE : Korean Journal of Air-Conditioning and Refrigeration Engineering
Korean Journal of Air-Conditioning and Refrigeration Engineering

Korean Journal of Air-Conditioning and Refrigeration Engineering

ISO Journal TitleKorean J. Air-Cond. Refrig. Eng.
  • Open Access, Monthly
Open Access Monthly
  • ISSN : 1229-6422 (Print)
  • ISSN : 2465-7611 (Online)
Title A Study on the Chilling Start-up Characteristicsand Performance of a Gas Loaded Heat Pipe
Authors 홍성은 ; 강환국
Page pp.915-922
ISSN 12296422
Keywords Variable conductance heat pipe ; 가변전열 히트파이프 ; Chilling start-up ; 냉시동 ; Gas loaded heat pipe ; 가스내장 히트파이프 ; Thermal resistance ; 열저항
Abstract Considering heat pipe design principles in fabrication and operational performances, water is one of the most recommended working fluids to make mid to low temperature heat pipes. But the conventional water heat pipes might encounter the failure in a cold start-up operation when socked at a chilling temperature lower than the freezing point. If they are subjected to a heat supply for start-up at a temperature around -20℃, the rate of the vapor flow and the corresponding heat transfer from the evaporator to the condenser is so small that the vapor keeps to stick on the surface of the chilling condenser wall, forming an ice layer, resulting in a liquid deficiency in the evaporator. This kind of problems was resolved by Kang et al. in 2004 by adopting a gas loading heat pipe technology to the conventional water heat pipes. This study was conducted to examine a chilling start-up procedure of gas loading heat pipes by investigating the behaviors of heat pipe wall temperatures. And the thermal resistance of the gas loaded heat pipe that depends on the operating temperatures and heat loads was measured and examined.
Two water heat pipes were designed and fabricated for the comparison of performances, one conventional and the other loaded with N2 gas. They were put on start-up test at a heat supply of 30W after having been socked at an initial temperature around -20℃. It was observed that the gas loaded one had succeeded in chilling start-up operation.