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Heat Transfer

Heat Transfer
Economy of an evaporator is influenced by the

Feed temperature
Steam pressure
Both B & C
Number of effect

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Heat Transfer
Choose the correct equation.

Nu = (Re) (Pr) (St)
Nu = (Pr)(St)
Nu = (Re) (Pr) (Gz)
Nu = (Re)(Pr)

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Heat Transfer
The actual temperature drop across the heating surface of an evaporator depends on the

Solution being evaporated
All of these
Pressure difference between the steam chest and the vapor space above the boiling liquid
Liquid depth over the heating surface

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Heat Transfer
What is the steam economy in case of a single effect evaporator system?

>1
1
< 1
0.1

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Heat Transfer
Conductance is given by(where, x = thickness, A = heat flow area, K = thermal conductivity.)

X/KA
KA/x
K/Ax
A/Kx

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Heat Transfer
Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around __________ metres/second.

10
30
1
20

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