Loop heat pipe for low voltage drives

A loop heat pipe, comprising:

• an evaporator comprising an enclosure with a heat receiving side and side walls with openings forming an evaporator chamber, the openings being disposed in the side walls, the evaporator chamber comprising a primary capillary structure adjacent to the heat receiving side of the enclosure and extending to and contacting the side walls of the evaporator chamber, a plurality of grooves in the primary capillary structure, each of which begins from an opening in one of the side walls and ends at an opening in an opposite side wall to connect the respective openings, the plurality of grooves being configured to transport vapor from the primary capillary structure to the openings, the evaporator chamber further comprising a secondary capillary structure with a flat portion in direct contact with the primary capillary structure and extending to the side walls of the evaporator chamber;
• and
• a condenser comprising a plurality of condenser paths, each path having an inlet,
• wherein the loop heat pipe further comprises a plurality of vapor ducts connected to the evaporator and the condenser,
• wherein the plurality of vapor ducts connect the openings to the inlets of the condenser paths,
• wherein the plurality of vapor ducts are arranged in at least one vapor duct layer surrounding the condenser so as to form an envelope of the loop heat pipe together with the evaporator, and
• wherein each vapor duct layer of the at least one vapor duct layer starts on one side wall of the side walls and runs rectangularly along three sides of the evaporator.