Experimental investigation of a copper-water loop heat pipe with additional sources


Аuthors

Pastukhov V. G.*, Maydanik Y. F.**

Institute of Thermal Physics of the Ural Branch of the Russian Academy of Sciences , Amundsena St., 107a Ekaterinburg, 620016, Russia

*e-mail: pastukhov@itp.uran.ru
**e-mail: maidanik@itp.uran.ru

Abstract

The problem of thermal regulation of current electronics is often associated with the presence

of many spatially distributed elements with different power dissipation. Two-phase heat

transfer devices — heat pipes are already widely used in thermal control systems. However, not

all of them are able to effectively remove heat from distributed sources and satisfy the requirements

for weight and size parameters. This paper presents the results of experimental investigations

of a loop heat pipe (LHP) intended for a simultaneous cooling of several heat sources of

different capacity. The LHP had a flat evaporator and a serpentine-shaped condenser joined by a

vapor line and liquid line. The evaporator was in thermal contact with the main heat source.

Two additional, less powerful heat sources were in contact with the heat exchangers located on

the vapor line and the liquid line. The structural material of the LHP and the capillary structure

was copper, and water was used as a working fluid. The LHP efficiency was evaluated by the

ratio of the maximum value of the heat load on the additional sources to the heat load of the

main source. The limiting condition for each of the sources was a temperature of 100°C. Tests

were conducted at a temperature of the liquid cooling the condenser equal 20°C. The maximum

LHP capacity without any additional heat sources was 750 W. It has been shown that at a nominal

heat load on the main source of 400 W the maximum load on the additional source located

on the liquid line was 70 W (17%) and on the source on the vapor line 9 W (~2%).

Keywords:

loop heat pipe, cooling system, heat source, heat exchange.

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