Generalizing Carnot To Include Fuel Cells

Carnot is almost two centuries old and only covers heat engines.

With the increasing interest in fuel cells it would be nice to have something that covers fuel cells as well as heat engines.

The similarities in processes as well as results between low pressure ratio highly recuperated gas turbines and fuel cells suggests that this may be possible:

LPR Gas Turbine: theoretical efficiency over 80%

Fuel cell: theoretical efficiency over 80%

LPRGT: even higher efficiency with ceramics that rapidly degrade

FC: even higher efficiency with materials that rapidly degrade

LPRGT: heat transfer

FC: mass transfer

LPRGT: big expensive heat exchanger area for heat transfer

FC: expensive contact area for mass transfer

Bret Cahill

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Bret Cahill
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Carnot applies to nuke, solar thermal and geo thermal -- all basically nuclear -- thermo cycles which should not be included in power from chemical oxidation - reduction / combustion reactions.

"Generalization of Carnot" isn't the best term. It should be "generalization of fuel oxidizing Carnot."

Bret Cahill

Reply to
Bret Cahill

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