Specifications

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FREQUENTLY ASKED QUESTIONS
additional outdoor ventilation air requirement for the
spectators. The extra outdoor air gets added to the
baseline requirement.
Condensate
Can I return condensate from the Seresco
dehumidifier back to my pool?
It is recommended that the condensate from the
dehumidifier be returned to the pool when local codes
permit. This is worth LEED points. The amount of
condensation recovered in one year is equivalent to one
complete pool fill. When allowed, the condensate is
returned to the pool filtration loop either upstream of the
filter or into the skimmer.
Cooling
Can I upsize my Seresco dehumidifier
for more cooling?
Yes. If the model initially selected has a sensible cooling
capacity less than what is required, a larger unit is
usually the most cost effective solution. Two compressor
systems can also be staged to help deliver only as much
cooling as is required at any given time.
Air Direction
Should there be air movement
at the water surface?
Yes. The U.S. Olympic Committee (USOC) does
recommend some air movement at the water surface
for its facilities to dilute a higher concentration of
chemicals where the swimmers breathe. Significant
air movement at the water surface (above 30 fpm per
ASHRAE) is not recommended however, as it does not
improve the IAQ and increases the evaporation rate and
affects bather comfort.
Return Air Intake Location
Where should I locate my return duct intake?
Ideally it should be located in a position to compliment
the supply duct air distribution pattern. If you
have overhead supply duct, then low returns are
effective. If the facility is large, several return intakes
are recommended.
Do not place a return intake near a whirlpool. Whirlpools
spew high concentrations of chemical and you don’t
want those introduced to you HVAC system. It is
recommended that these chemicals be source captured
with exhaust air intake and removed from the space
before they have a chance to diffuse instead.
Duct Insulation
Why do I need duct insulation?
When ductwork passes through unconditioned areas
it should be thermally insulated with duct wrap on
the outside. This will prevent condensation and heat
gain/loss.
Acoustic insulation from the unit up to the first supply
and return duct turns can help reduce air noise.
Indoor Water Parks
What are the key design recommendations?
These facilities are considerably more complex than
a traditional Natatorium. They generally have unique
architectural and water features. The high occupant
density and large dehumidification load makes it
additionally challenging. The experts at Seresco are
ready to assist with this complex task!
All Glass Structures
What are some of the design challenges?
Condensation and the large volumes of supply air
required to condition the space are big challenges.
Condensation is obvious. The entire structure is
essentially a window and must be blanketed with air.
The heating and cooling requirements will be very
high. To address these issues a significant amount of
supply air will be required. It is not uncommon to see air
changes well in excess of 12 per hour in these facilities.