A Practical Manual On Sea Water Distillation
With A Description Of The Necessary Machinery For The Process
Forfatter: Frank Normandy
År: 1909
Forlag: Charles Griffen & Co., LTD.
Sted: London
Sider: 244
UDK: 663.6
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THE EVAPORATOR.
II9
To meet the above requirement, the heat available is—
927 units, for every lb. of primary steam converted
into water—latent heat.
116 units, for cooling down the primary water
from 266 to 150—sensible heat.
1,0 43 units, available.
Therefore, as 1,043 : 1,104 :: 1 : T06 (nearly)—i.e., l‘O6
lbs. of primary steam will be converted into primary
water for the production of every lb. of gained water,
and the primary water will leave the heater at 150°.
111. But if the feed-water had not been heated by using
the 116 units out of the primary water heat, the economy
would have been as follows :—As 927 : 1,104 :: 1 : T19—
i.e., 119 lbs. of primary water for every lb. weight of
gained steam produced.
112. The economy of 1’06 is, of course, ideal, as no
allowance is made for waste of heat by radiation, which
is considerable, especially if the evaporators (during trials)
are not lagged on the outside of the casing, a recent
condition sometimes imposed (but the reason of it is
difficult to account for).
113. The economy, in actual practice, will, therefore, be
more than 1'06, and the specified limit imposed by the
Admiralty of 1’2 will be much nearer actual results than
the ideal of 1'06.
Heaters, Lagging of—Position.
114. The heater should be lagged on the outside, and
such lagging may consist of the same material used for the
evaporator shell, and the heater should be placed close
to the evaporator, where it is fed, so that the feed-water