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
When the inlet pressure of steam is equal to the exit pressure, then

There is a pressure drop in the nozzle
Pressure drops and fluid flows through the nozzle
There is no pressure drop and fluid does not flow through the nozzle
Fluid flows through the nozzle

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