Modeling and test of a thermosyphon loop for the cooling of a megawatt-range power electronics converter

A thermosyphon loop, designed for the thermal management of a large Medium voltage power converter 5 MW overall, corresponding to 2.4 kW load per cooling unit) is presented. The device mainly made an evaporator, condenser and reservoir connected with plastic liquid vapor lines. Novec 649 (3M) has been chosen as working fluid due environmental electrical concerns. model loop described, its predictions are compared experiments. first comparison yields maximum mean deviation 20 % between experimental results numerical simulation at coolant temperature. main sources errors identified, improvements proposed better accuracy.