Heat Transfer
Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m² .°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the

Lower pressure drop through the exchanger is desired
Temperature of the incoming vapor is very high
Higher condensing film co-efficient is desired
Condensate is corrosive in nature

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Heat Transfer
Which of the following situations can be approximated to a steady state heat transfer system?

A red hot steel slab (having outside surface temperature as 1300°C) exposed to the atmosheric air at 35°C
A sub-cooled refrigerant liquid at 8°C flowing at the rate of 6 Kg/minute through a copper pipe exposed to atmospheric air at 35°C
Boiling brine kept in open vessel when the bottom surface temperature of the vessel is maintained constant at 180°C
10 kg of dry saturated steam at 8 kgf/cm² flowing through a short length of stainless steel pipe exposed to atmospheric air at 35°C

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Heat Transfer
In a shell and tube heat exchanger,

The temperature drops in the two fluids and the wall are proportional to individual resistances
There is no relationship between temperature drop and resistance
The relationship is not generalised
The temperature drop is inversely proportional to the resistance across which the drop occurs

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