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A Study on the Heat Transport Limitations of a PFC(FC-72) Two-Phase Closed Thermosyphon for Cooling Power Semiconductors  

박용주 (성균관대학교 기계공학부 대학원)
홍성은 (유한대학교 건축설비과)
김철주 (성균관대학교 기계공학부)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.14, no.9, 2002 , pp. 725-733 More about this Journal
Abstract
In this study, the heat transport limitations of a two-phase closed thermosyphon were investigated. For the test, a two-phase closed thermosyphon ($L_t/: 600 mm,\;L_e:105mm,\;L_a:75mm,\;L_c:420mm,\;D_o:22.2mm,$ container: copper (inner grooved surface), working fluid: PFC ($C_6F_14$) was fabricated with a reservoir that can change the fill charge ratio. The following was imposed as the factors on the heat transport limitations of a two-phase closed thermosyphon. 1) Fill charge ratio of the working fluid. 2) Tilt angle of the longitudinal axis. From tile experimental data, some results were obtained as follows. When the fill charge ratio was relatively small ($\psi$20%), the heat transport limitation occurred about 100W by dry-out limitation. However over 40%, it shelved nearly constant value (500 W) by flooding limitation. The heat transport limitation according to the tilt angle increased smoothly until the tilt angle was $60^{\circ}$,/TEX>, after then decreased slowly.
Keywords
Two-phase closed thermosyphon; Limitation; Fill charge ratio; Tilt angle; Dry-out; Flooding;
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