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Always less than h₁

Always between h₁ and h₂

Always higher than h₂

Dependent on metal resistance

Increasing temperature of the vapour

Decreasing temperature of the vapour

Increasing viscosity of the film of condensate

Increasing temperature drop

Supersaturated

Saturated

Wet

None of these

Boiling point elevations

Temperature of the feed

Rate of heat transfer

Ratio of the weight of the thin liquor to thick liquor

Boiling point

Dynamic viscosity

Kinematic viscosity

Density

165.4

167.5

172.5

175

N = 0.4 is used for heating

N = 0.3 is used for cooling

Reynolds number for the flow involved is > 10000

Reynolds number for the flow involved is < 2100

0.4 – 0.6

1-1.3

1.8-2

2 – 2.4

Reduce the capacity

Reduce the economy

Increase the economy

None of these

(ΔT)2

√ΔT

(ΔT)1/4

(ΔT)3/2