The working characteristics of two-phase heat transfer devices for LED modules

To cool the high-power light emitting diode modules (LEDM) in lighting device it is promising to use two-phase heat transfer devices (TPHTD) - thermosyphons (TS) and heat pipes (HP), the equivalent thermal conductivity of which is hundreds of times greater than the thermal conductivity of metals. To this end, it is the most effective to use TPHTD as LED chandelier frame elements. The paper presents the results of experimental studies of thermal resistance and heating zone temperature in the two-phase thermosyphon with a smooth evaporation surface and in the gravitational heat pipe with thread-capillary structure in the evaporation zone, filled with freone 141b, under conditions of condensation zone cooling by natural air convection.