HEAT EXCHANGERS

Heat exchange between flowing fluids takes place inside a heat exchanger. In heat exchangers, the temperature of each fluid changes as it passes through the exchanger, and hence the temparature of the dividing wall between the fluids also changes along the length of the exchanger.

There are three main types of heat exchangers :-

(a)   Recuperator, in which the flowing fluids exchanging heat are on either side of a dividing wall.     

(b)              Regenerator, in which the hot and cold fluids pass alternatively through a space
containing solid particles, these particles providing alternately a sink and a
source for heat flow.

(c)              Evaporative type, in which a liquid is cooled evaporatively and continuously in the same space as the coolant. Examples are cooling tower and Jet Condenser.

RECUPERATOR

In almost all recuperators, heat flows from a hot fluid to a cooler one through an intermediate heat conductive wall.

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