Question

Which of the following can be evaporated in plate-and-frame or agitated thin-film evaporator?

(a) High viscosity, heavy solids, high tendency to foul

(b) Heavy solids, high tendency to foul

(c) High viscosity, heavy solids,

(d) High viscosity, high tendency to foul

The question was asked in an interview for internship.

Query is from Evaporation of Heat Sensitive Materials in portion Evaporation of Food Processing Unit Operations

Answer 1

Right answer is (a) High viscosity, heavy solids, high tendency to foul

Easiest explanation: Car radiator and air conditioner evaporator coil uses crossflow heat exchangers. Crossflow heat exchangers are widely used for transfer of heat between a gas and a liquid. In air conditioner evaporator coil, the air flows past the evaporator coils are cooled by the cold refrigerant that is flowing inside the tubes of the coil.