COPYRIGHT
_
DRI-EAZ PRODUCTS, INC. 1997
4
outdoors. The unit achieves this benefit without
causing security problems or excess energy loss.
Two airstreams pass through the Dri-X. They
introduce outdoor air to the restoration environ-
ment, while at the same time expelling indoor air
from the building.
One airstream takes air from a room and blows
it outdoors. This airstream not only carries the ex-
cess humidity, it also exhausts pollutants including
odors, mold spores, dust, allergens and pathogens.
All are removed harmlessly to the outdoors.
Meanwhile, in the second airstream, dry, fresh,
clean air from outside the room or building is
pulled through the Dri-X in the other direction and
blown into the room.
While passing through the Energy Exchange
Core, the airstreams exchange heat, thus retaining
the energy of the building's heating or air condi-
tioning systems.
The difference between indoor and outdoor
temperature and specific humidity conditions is
measured in grains per pound (specific humidity).
This difference determines the Dri-X's efficiency
in reducing humidity. The greater the difference,
the more effective the unit. That is, the drier the
air outdoors, compared to the air indoors, the
faster the Dri-X reduces indoor humidity and
speeds the drying process.
Operating Position and Storage Position
The Dri-X must always be
operated
in the horizontal position. It
can be
transported or stored
in the upright position as shown.
When the air is much colder outdoors than in-
doors, and the indoor air is very humid, some of
the outgoing moisture condenses in the Energy
Exchange Core. This condensed water drains out
of the Core into the drip tray, where it collects and
is pumped out. A 40-foot hose from the unit is
placed in any convenient drain.
The amount of moisture being pumped out is
only a small percentage of the water being re-
moved from the room. A much greater amount is
being removed as invisible water vapor in the air-
stream passing to the outdoors. You cannot judge
the effectiveness of the Dri-X by measuring the
water coming from the pump hose; you can only
judge it by calculation. See the section on Esti-
mating Water Removal.
Use When Outdoor Air is Dry
To know if the Dri-X Airchanger will efficient-
ly remove humidity on any job, you must know
that the outdoor air is actually drier than the indoor
air. You can do this easily using a thermo-
hygrometer, plus the Calculator provided with the
Dri-X or a standard psychrometric chart.
Outdoor air is quite often drier than indoor air,
especially in restorative drying situations. The
section on Water Removal Rates will help you un-
derstand this fact. In many areas of the country, at
many times, outdoor air is drier that the air indoors
during a water damage situation with high indoor
humidity.
When outdoor air is "wetter" than indoor air
(again, as measured in grains per pound), the Dri-
X should not be used because it would actually
raise the indoor humidity. This would sometimes
be the case in areas such as the South Atlantic and
Gulf Coast states, or the Midwest in the summer
on days of high humidity. When outdoor air is
wetter, the Dri-X should be turned off.
When the specific humidity or grains per pound
of the outdoor air and the indoor air are the same,
no change in the indoor humidity will result.
However, at these times the Dri-X can still be used
to improve IAQ by exchanging the indoor and
outdoor air.
Outdoor Air is Usually Cleaner
Indoor air quality in a water-damaged building
can be uncomfortable and even unhealthy. Con-
taminants may include offensive odors activated
and released by water, dust from moving furniture
During
Operation
During
Storage