Heat Transfer
Steady state one dimensional heat flow by conduction as given by Fourier's low does not assume that

There is no internal heat generation
Boundary surfaces are isothermal
Constant temperature gradient exists
Material is anisotropic

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

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

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