Steam Boilers, Engines, Nozzles and Turbines
The indicated thermal efficiency is defined as the

Ratio of brake power to the indicated power
Product of thermal efficiency and Rankine efficiency
Ratio of heat equivalent to indicated power to the energy supplied in steam
Ratio of thermal efficiency to the Rankine efficiency

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Steam Boilers, Engines, Nozzles and Turbines
In regenerative air preheaters, the heat is transferred

Heat is transferred by bleeding some gas from furnace
By direct mixing
From a metal wall from one medium to another
From heating an intermediate material and then heating the air from this material

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