Chemical Engineering - Heat Transfer

The purpose of floating head in a heat exchanger is to

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

Overall thermal resistance for conductive heat transfer through a series of flat resistances is equal to the

Double pipe heat exchangers are preferably useful, when

Removal of __________ heat is involved in the condensation of a vapor under saturated conditions.