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

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

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Steam Boilers, Engines, Nozzles and Turbines
In designing air preheaters, the important design consideration is that

Approach temperature should be as low as possible
Handling and maintenance should be easier
Stack gases should not be cooled to the dew point
Heat transfer area should be optimum

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