What was the typical peak thermal efficiency range achieved by highly optimized triple-expansion reciprocating engines?

Answer

18% to 20%

When designed for applications like marine propulsion, the pinnacle of triple-expansion reciprocating designs could achieve thermal efficiencies in the range of 18% to 20% under ideal, large-scale conditions.

What was the typical peak thermal efficiency range achieved by highly optimized triple-expansion reciprocating engines?

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