Steam Boilers, Engines, Nozzles and Turbines
In recuperative 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
Heat is transferred by bleeding some gases from furnace
By direct mixing

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Steam Boilers, Engines, Nozzles and Turbines
For water, at pressures below atmospheric;

Melting point rises markedly and boiling point drops markedly
Melting point drops slightly and boiling point drops slightly
Melting point rises slightly and boiling point drops markedly
Melting point drops slightly and boiling point drops markedly

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