Steam Boilers, Engines, Nozzles and Turbines
Relative percentage of heat absorbed through the heat transfer of(i) Furnace water wall(ii) Boiler tank(iii) Superheater(iv) Economizer(v) Air-heater of a typical boiler of 200 MW capacity would be of the order of

20 : 48 : 7 : 15 : 10
7 : 15 : 20 : 10 : 48
10 : 7 : 15 : 20 : 48
48 : 20 : 15 : 7 : 10

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

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