Specifications

21
ENERGY CONSUMPTION CONSIDERATIONS
introduces a lot of moisture and increases the
dehumidification load.
In northern regions outdoor air in winter may need
to be heated 100°F just to get neutral to the space
temperature in the pool!
The designer has several energy issues to consider:
• Introducing more outdoor air than codes is not
recommended:
- In winter it will increase space heating and pool
water heating costs significantly.
- Too much outdoor air in winter can also lower the
relative humidity levels to uncomfortable levels for
the patrons. Yes, the pool room can actually be
too dry!
- In summer it can introduce so much additional
moisture that larger equipment could be needed.
• Warm “energy rich” air is required to be exhausted
from the space to maintain negative pressure and
good IAQ.
Energy recovery from the “energy rich” exhaust air to
outdoor air should be considered.
Air-to-air heat exchangers are available for both sensible
heat recovery and total energy recovery. Sensible only
devices are used in Natatoriums. All sensible recovery
devices are effective but some are better suited to
provide a cost effective solution. Figure 12 shows
two examples. There are several considerations to
determining the need and feasibility of heat recovery:
• Is the installation in a northern application?
• Does the outdoor ventilation air need to be
conditioned in order to avoid condensation when
blended with the room air in summer and winter?
• Are the outdoor ventilation air and exhaust air
streams within close proximity to each other?
• What is the payback on this investment?
Heat recovery is generally packaged as part of a
dehumidifier when outdoor or rooftop installations
are specified. Figure 13 shows a schematic of the
preferred heat recovery method used by Seresco. The
heat recovery devices in Figure 12 require special and
complicated air paths within the unit. This increases the
unit size and cost and also has a large airside pressure
drop which increase blower motor sizes and operating
costs. Seresco has chosen a better solution and
opted for a heat recovery option that can be packaged
seamlessly within the standard dehumidifier or can be
remotely installed in the ductwork.
Seresco provides unit mounted heat recovery using
a glycol run-around loop. This option is available in
NP, NE, NV and NW Series units. This approach to
heat recovery offers the best performance and design
flexibility while staying in the smallest possible cabinet.
This heat recovery coil set fits directly onto the outdoor
air and exhaust air openings already provided on the
unit and does not increase the cabinet size. They are
also easily sized to meet the specific requirements of
your facility. The result is a compact, cost effective heat
Figure 12 – Heat Exchanger
Figure 13 – Packaged Heat Recovery