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Heat Transfer

Heat Transfer
Open pan evaporators are preferred to be used, when the solution to be concentrated is

Corrosive
Scaling
Highly viscous
Salty

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Heat Transfer
The inside heat transfer co-efficient in case of turbulent flow of liquid in the tube side in a 1-2 shell and tube heat exchanger is increased by __________ times, when the number of tube passes is increased to 8.

40.4
40.8
20.8
20.4

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Heat Transfer
1 BTU/hr.ft.°F is equal to __________ kcal/hr. m.°C.

1
4.88
1.49
None of these

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Heat Transfer
Indirect contact heat exchangers are preferred over direct contact heat exchangers, because

There is no mist formation
Cost of equipment is lower
There is no risk of contamination
Heat transfer co-efficient are high

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Heat Transfer
Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the __________ zone.

transition
None of the listed here
highly turbulent
laminar

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Heat Transfer
The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m².K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m².K. The overall heat transfer co-efficient at this time is

1200W/m².K
333W/m².K
894W/m².K
287 W/m².K

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