Heat Transfer
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is

Shell and tube heat exchanger with air inside tubes and steam on shell side
Shell and tube heat exchanger with air on shell side and steam inside tubes
Finned tube heat exchanger with air inside and steam outside
Finned tube heat exchanger with air outside and steam inside

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Heat Transfer
Leidenfrost point is a term concerned with the

Condensation of the saturated vapor on a cold surface
Boiling of a liquid on a hot surface
Heat transfer between two highly viscous liquids
Concentration of a corrosive solution by evaporation

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Heat Transfer
A process stream of dilute aqueous solution flowing at the rate of10 Kg.s⁻¹ is to be heated. Steam condensate at 95°C is available for heating purpose, also at a rate of 10 Kg.s⁻¹. A 1 - 1 shell and tube heat exchanger is available. The best arrangement is

Counter flow with process stream on tube side
Parallel flow with process stream on shell side
Parallel flow with process stream on tube side
Counter flow with process stream on shell side

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