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Heat Pipe Science and Technology, An International Journal

ISSN Print: 2151-7975
ISSN Online: 2151-7991

Archives: Volume 1, 2010 to Volume 8, 2017

Heat Pipe Science and Technology, An International Journal

DOI: 10.1615/HeatPipeScieTech.v2.i1-4.130
pages 121-131

TWO-PHASE SYSTEMS FOR LIGHT-EMITTING DIODES COOLING

Valery M. Kiseev
Ural Federal University, Department of Thermophysics and Surface Phenomena, Lenin av. 51, 620083, Ekaterinburg, Russia
Dmitry S. Aminev
Ural Federal University, Department of Thermophysics and Surface Phenomena, Lenin av. 51, 620083, Ekaterinburg, Russia
Victor G. Cherkashin
Ural Federal University, Department of Thermophysics and Surface Phenomena, Lenin av. 51, 620083, Ekaterinburg, Russia

ABSTRACT

Extensive development of the light-emitting diode (LED) devices on the basis of LED matrix offers capabilities for LED to occupy an increasingly important place for street and industrial lighting as more reliable and energy-efficient. However, there are not enough experimental data on the optimization of the cooling systems for LED devices. Traditionally, the cooling systems for LED devices are designed with even pitch of LED locations on the radiator's surface. By the increase of LED power the radiator's surface and the distance between the LED locations grows correspondingly. It results in the increase of the mass and size of the LED device. This paper presents some designs of twophase thermal control systems for the LED cooling on the basis of conventional thermosyphon, loop thermosyphon, and heat pipe and studies the experimental data, which were investigated for the twophase systems considering the gravity influence. The presented results include: some designs of the two-phase systems for the LED cooling; start-up characteristics under low, high, and intermediate powers; power cycling (monotonic and random) and sink temperature cycling behavior; and temperature drop and temperature oscillations during startup and working regime.


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