Thermal performance of a closed advanced two-phase thermosyphon loop for cooling of radio base stations at different operating conditions

Abstract In this investigation an advanced thermosyphon loop with extended evaporator and condenser surfaces has been tested at high heat fluxes. The thermosyphon investigated is designed for the cooling of three parallel high heat flux electronic components. The tested evaporators were made from small blocks of copper in which five vertical channels with a diameter of 1.5 mm and length of 14.6 mm were drilled. The riser and downcomer connected the evaporators to the condenser, which is an air-cooled roll-bond type with a total surface area of 1.5 m 2 on the airside. Tests were done with Isobutane (R600a) at heat loads in the range of 10–90 W/cm 2 to each of the components with forced convection condenser cooling and with natural convection with heat loads of 10–70 W.

[1]  Ulrich Gross,et al.  Reflux condensation heat transfer inside a closed thermosyphon , 1992 .

[2]  Issam Mudawar,et al.  Assessment of high-heat-flux thermal management schemes , 2000, ITHERM 2000. The Seventh Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (Cat. No.00CH37069).

[3]  Milorad Bojić,et al.  Controlling evaporative three finger thermosyphon , 2002 .

[4]  Yogendra Joshi,et al.  Performance of a Compact Two-Chamber Two-Phase Thermosyphon : Effect of Evaporator Inclination , Liquid Fill Volume and Contact Resistance , 1998 .

[5]  A. E. Bergles.  Heat transfer in electronic and microelectronic equipment , 1990 .

[6]  Rahmatollah Khodabandeh.  Pressure drop in riser and evaporator in an advanced two-phase thermosyphon loop , 2005 .

[7]  K. S. Ong,et al.  Experimental investigation on the hysteresis effect in vertical two-phase closed thermosyphons , 1999 .

[8]  I. Mudawar,et al.  Optimization of Enhanced Surfaces for High Flux Chip Cooling by Pool Boiling , 1993 .

[9]  Pradit Terdtoon,et al.  Correlations to predict heat transfer characteristics of an inclined closed two-phase thermosyphon at normal operating conditions , 2000 .

[10]  Rahmatollah Khodabandeh,et al.  An Experimental Investigation of Critical Heat Flux (CHF) in a Vertical Narrow Channel in an Advanced Thermosyphon Loop , 2001 .

[11]  Rahmatollah Khodabandeh.  Heat transfer in the evaporator of an advanced two-phase thermosyphon loop , 2005 .

[12]  Said I. Abdel-Khalik,et al.  Hydrodynamic characteristics of counter-current two-phase flow in vertical and inclined channels: effects of liquid properties , 1997 .

[13]  Amir Faghri,et al.  An analysis of two-phase flow stability in a thermosyphon with tube separator , 1998 .

[14]  Rahmatollah Khodabandeh,et al.  An Experimental Investigation of the Influence of System Pressure on the Boiling Heat Transfer Coefficient in a Closed Two-Phase Thermosyphon Loop , 2002 .

[15]  Avram Bar-Cohen,et al.  Thermal management of electronic components with dielectric liquids , 1993 .

[16]  Hosny Z. Abou-Ziyan,et al.  Performance of stationary and vibrated thermosyphon working with water and R134a , 2001 .

[17]  Rahmatollah Khodabandeh,et al.  AN EXPERIMENTAL INVESTIGATION OF THE INFLUENCE OF THREADED SURFACE ON THE BOILING HEAT TRANSFER COEFFICIENTS IN VERTICAL NARROW CHANNELS , 2002 .

[18]  Amir Faghri,et al.  Steady-state performance in a thermosyphon with tube separator , 1997 .

[19]  Wei-Keng Lin,et al.  The application of capillary pumped loop for cooling of electronic components , 2001 .

[20]  Rahmatollah Khodabandeh,et al.  Choosing Working Fluid for Two-Phase Thermosyphon Systems for Cooling of Electronics , 2003 .