In a recuperative air preheater, the heat is transferred____________________?

Steam Boilers, Engines, Nozzles and Turbines 12/08/2020

A. from a metal wall from one medium to another
B. from heating an itermediate material and then heating the air from this material
C. by direct mixing ,
D. heat is transferred by bleeding some gases from furnace
E. none of the above

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