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  4. Experimental evaluation of the thermal performances of a thermosyphon cooling system rejecting heat by natural and forced convection
 
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research article

Experimental evaluation of the thermal performances of a thermosyphon cooling system rejecting heat by natural and forced convection

Cataldo, Filippo  
•
Thome, John R.  
2017
Applied Thermal Engineering

In the present paper, a closed-loop thermosyphon cooling system for power electronics has been developed and tested. The evaporator is a multi-microchannel heat sink designed for high heat fluxes. The power electronics module is emulated by four independent electrical heaters, which can generate a non-uniform heat flux on the evaporator. The condenser is air-cooled and is tested in both natural convection and forced convection modes. R1234ze has been selected as the working fluid. Although in natural convection mode the cooling system experiences a maximum thermal resistance of approximately 0.6 K/W, the complete passiveness makes such a system very attractive. With values of heat fluxes of 107 W/cm(2) and 25 W/cm(2) equally distributed on the four heaters, the maximum heater temperature measured is 53 degrees C at a saturation temperature of 45 degrees C. In forced convection mode, two different values of air flow have been tested. A reduction of 50% on the overall thermal resistance has been measured with an imposed air flow rate of 87.8 m(3)/h, consuming only 5.29 W to drive the fan for dissipating 70.2 W. At this condition, the maximum heater temperature is reduced to 36 degrees C. In summary, it has been demonstrated that a thermosyphon coupled with air cooling can dissipate high heat fluxes of power electronics with no or little energy consumption. (C) 2017 Elsevier Ltd. All rights reserved.

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Type
research article
DOI
10.1016/j.applthermaleng.2017.08.166
Web of Science ID

WOS:000413608400134

Author(s)
Cataldo, Filippo  
•
Thome, John R.  
Date Issued

2017

Publisher

Pergamon-Elsevier Science Ltd

Published in
Applied Thermal Engineering
Volume

127

Start page

1404

End page

1415

Subjects

Thermosyphon cooling system

•

Flow boiling

•

Natural convection

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LTCM  
Available on Infoscience
December 4, 2017
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/142507
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