Cork insulation; a complete illustrated textbook on cork insulation ...

STRUCTURAL SUGGESTIONS 205
and under almost all conditions, to produce normal-minus humidity;
therefore, in order to keep the air up to normal, it is usually neces-
sary to introduce moisture, either with the fresh, ventilating air, oi
with the recirculated air. In either case, a fully saturated air may be
introduced when necessary, without danger of depositing moisture on
the goods, due to the fact that it will be mixed with a much greater
volume of normal-minus air before coming into contact with the
goods.
At certain seasons of the year, namely, during periods of low
temperature, when the refrigerating coils are not being used, except
to a very limited extent, if at all (and therefore their drying effect is
greatly reduced or stopped entirely), nature still provides ample means
FIG. 69.—INSULATED BANANA ROOM EQUIPPED WITH OVERHEAD
BUNKERS AND PATENTED CONTROL SYSTEM.
of controlling the humidity, by furnishing cold air which, when raised
to the temperature requirements of the room, will be comparatively
dry and may be introduced in sufificient volume to offset other con-
ditions, and thus maintain the circulating air in normal condition.
Theoretically, the system which would maintain ideal air condi-
tions would be one which circulated fresh, pure, conditioned air, at
the proper temperature, through the goods in ample volume, and
discharged it after one passage through the goods, but this is impracticable,
due to the great expense of purifying, conditioning and cooling
such a volume, and the enormous loss occasioned by discarding the
air at such a temperature, and unnecessarily, as practically the conditions
may be secured in another manner, that is, by introducing a
small amount, comparatively, of pure air, which will rectify the air
consumed or contaminated by the goods.