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For generators over 100 Mega-Watts, they were almost always hydrogen cooled. The hydrogen has good thermal transfer properties and reduced windage losses. I expect the Argon will not create convection currents as well as air. But it is marginal...
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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