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 function of a piston rod is

To guide motion of the piston rod and to prevent it from bending
To exhaust steam from the cylinder at proper moment
To transfer motion from the piston to the cross head
To convert heat energy of the steam into mechanical work

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