Environmental Engineering Reference
In-Depth Information
temperature can also be explained from an energy point of view by this income of energy. For
that reason, the heat flux density
q
feed
which comes from the preheating of water has been
defined and evaluated with respect to the reference temperature, taken equal to the
temperature of the condensation plate
T
c
. Thus, the heat flux density brought by the feed can
be expressed as
q
=
m
.
C
.(
T
−
T
)
(4)
a
a
p
a
Figure (3 a) presents the variation of the exchanged heat flux densities during distillation.
It appears that
q
feed
increases with temperature
T
feed
, hence the increase of
q
l
and thus of the
quantity of desalted water. The preheating of the feed water contributes to the improvement
of the yield of distillation.
a
b
Figure 4. Influence of the temperature of water feed on the distribution between the exchanged fluxes
(a) and on the yield (b). (
q
f
= 600 W/m²,
m
feed
= 1.95 l/h,
T
c
= 24.14°C).
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