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

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

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

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

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