HEAT EXCHANGERS TYPES :
Heat Exchangers: Regenerators and
Recuperators
A heat exchanger is an
equipment where heat energy is transferred from a hot fluid to a colder fluid.
The transfer of heat energy between the two fluids could be carried out (i)
either by direct mixing of the two fluids and the mixed fluids leave at an
intermediate temperature determined from the principles of conservation of
energy, (ii) or by transmission through a wall separating the two fluids. The
former types are called direct contact heat exchangers such as water cooling
towers and jet condensers. The latter types are called regenerators,
recuperator surface exchangers.
In
a regenerator, hot and cold fluids alternately flow over a surface which
provides alternately a sink and source for heat flow. Fig. 10.1 (a) shows a
cylinder containing a matrix that rotates in such a way that it passes
alternately through cold and hot gas streams which are sealed from eac other.
Fig. 10.1 (b) shows a stationary matrix regenerator ill which hot and cold
gases flow through them alternately.
Fig.
3.1 (a) Rotating matrix regenerator
In a recuperator, hot
and cold fluids flow continuously following he same path. The heat transfer
process consists of convection between the fluid and the separating wall,
conduction through the wall and convection between the wall and the other
fluid. Most common heat exchangers are of recuperative type having a Wide
variety of geometries:
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