Heat Transfer
Fouling factor

Does not provide a safety factor for design
Is a dimensionless quantity
Accounts for additional resistances to heat flow
None of these

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

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

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