Heat Transfer
Multiple effect evaporation is generally recommended, when the

Fuel is cheaply available
Corrosive liquids are to be concentrated
Evaporation on small scale is to be done
Large scale evaporation of liquor is needed

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Heat Transfer
1000 Kg of liquid at 30°C in a well stirred vessel has to be heated to 120°C, using immersed coils carrying condensing steam at 150°C. The area of the steam coils is 1.2 m² and the overall heat transfer co-efficient to the liquid is 1500 W/m².°C. Assuming negligible heat loss to the surrounding and specific heat capacity of the liquid to be 4 kJ/kg.°C, the time taken for the liquid to reach desired temperature will be

44 min
51 min
22 min
15 min

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