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Its evaporation loss

Excessive corrosion

Uneconomic LMTD

Decrease in heat exchanger efficiency

Film

Sub-cooled

Saturated nucleate

None of these

Loosing sensible heat

Heat transfer to surroundings

Vaporisation due to heat loss to air

Loosing latent heat

U-tube

Double pipe

Fixed tube

Floating head

0.5

2

10

100

Absorbs

Reflects

Transmits

None of these

Large scale evaporation of liquor is needed

Corrosive liquids are to be concentrated

Fuel is cheaply available

Evaporation on small scale is to be done

Rate of heat transfer

Flow velocity

Turbulence of shell side fluid

All of the above

Occupies smaller space

Is more economical

Is easy to operate and maintain

All of the above

Nst α f

Nst α NRe

NNu α f

NRe α f