From Sensidyne, LP
Most large electrical generating equipment has a pressurized direct or indirect hydrogen cooling system for the generator. Hydrogen conducts heat 7 times better than aire, making it an ideal coolant for the generators. Its low density (0.07 relative to air of 1.0) minimizes windage losses, as long as purity is maintained above 90%.
Analytical equipment is used to measure and control h2 purity, as well as measure CO2, which is used to purge the generator of air during start-up, and purge the hydrogen during shutdown. This prevents the formation of a flammable mixture.
Direct h2 cooling systems circulate the hydrogen through the generator shell for heat dissipation, although, and external heat exchanger is sometimes employed.
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