**6. Evaluation of the thermal performance**

To summarize the analysis of the thermal performance of the heat pipes and the thermosyphon, different types of passive heat transfer devices were experimentally evaluated and compared. The considered devices were a rod, a thermosyphon, a mesh heat pipe, a grooved heat pipe, and a sintered heat pipe. The analyzed operating positions were vertical and horizontal. The experimental tests were repeated three times and the errors were compared taking into account the difference between the mean values less than 0.5°C. The tests were performed at increasing heat loads of 5 W, ranging from 5 to 45 W for both positions.
