The Carnot Limit

The Carnot limit caps the efficiency of any heat engine. Direct energy conversion sidesteps it entirely — the efficiency case for the Kronos approach.

What

Maximum efficiency of a heat engine

Formula

1 − T_cold / T_hot

Steam plants

Bound by it (~33–45%)

DEC

Bypasses it — not a heat engine

The Carnot limit is a hard law of thermodynamics: any engine that makes work by moving heat from a hot reservoir to a cold one can convert, at most, a fraction 1 − T_cold/T_hot of that heat into useful work. It is why conventional thermal power plants — coal, gas, fission, and D–T fusion with a steam cycle — top out around 33–45% efficiency no matter how well engineered.

The Kronos direct-energy-conversion strategy sidesteps the Carnot limit entirely, because it is not a heat engine: it captures the energy of charged particles and radiation as electricity without ever boiling water. That is the fundamental efficiency argument for pairing DEC with a low-neutron fuel — and a major reason the design's engineering gain can exceed what a thermal fusion plant would reach.