Horizontal Short tube

Vertical Short Tube

Climbing film evaporator

Falling film evaporator

Evaporation ProblemA small batch-evaporator evaporates water from a dilute solution of a pharmaceutical material until a concentrated solution is obtained, employing steam at 250 F . Knowing that the latent heat of steam 965 Btu/lb. and employing the underlined data in the following table, calculate the minimum area of heat transfer of the evaporator: Rate of evaporation 10 lb. of water per (min.)Boiling point of solution (F )Overall heat transfer coefficient(Btu/ hr.ft.F)

When diluteWhen conc.

6213227386

10213221265.8