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
From a metal wall from one medium to another
By direct mixing
Heat is transferred by bleeding some gas from furnace

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Steam Boilers, Engines, Nozzles and Turbines
The nozzle efficiency is the ratio of

Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam
Workdone on the blades to the energy supplied to the blades
Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam
None of these

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