Heat Transfer
To reduce the tube side pressure drop for the same flow rate, the heat exchanger recomended is

3-2 heat exchanger
1-2 heat exchanger
1-1 heat exchanger
2-4 heat exchanger

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

None of these
Through a metallic wall
By heating an intermediate material (like chequor bricks) and then heating the air from this hot material
By direct contact of hot flue gas with air

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