Abstract:
In order to make it possible, using air in particular, to cool certain high power tubes the collector of which has dimensions too small to permit of such cooling itself, the invention provides for the association with the collector, cooled by evaporation of liquid, of a large-area element delimiting a closed volume partially occupied by the liquid mass in question, the cooling of said element being responsible for producing condensation of the vapour resulting from said evaporation, and the regeneration of the liquid mass.