In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred

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In a regenerative air preheater, heat is transferred by heating an intermediate material (such as chequor bricks) with hot flue gas. This hot material then transfers the heat to the air, effectively preheating it before it enters the combustion process or space to be heated, like coke ovens. This method does not involve direct contact between the hot flue gas and the air, nor does it rely solely on a metallic wall for heat transfer.

In Regenerative Air Preheater (As Practised in Heating of Coke