Thermal Electric Generator - sswelm/KSP-Interstellar-Extended GitHub Wiki

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Generators convert the thermal power output by the reactor into electrical power and waste heat. Their efficiency determines what percentage of that thermal power is converted into electricity. The rest becomes waste heat.

Typical heat engines in space use closed cycle Brayton gas turbines ( wikipedia ). For traditional molten salt-based fission reactors, this type of generator gives a maximum theoretical efficiency of 31%. Upgrading the electric generators changes the theoretical efficiency to 60%!