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Ventilation systems designers
have realized the benefits of using Energy Recovery Ventilators (ERVs) in
commercial and institutional buildings. However, as with many newly adopted
technologies, questions of how best to apply this product are being raised. One
application issue in particular is whether to apply an ERV as a stand alone unit
on its own curb, or as a bolt-on accessory to a rooftop air conditioning unit.
Ventilation systems designers have realized the benefits of using Energy
Recovery Ventilators (ERVs) in commercial and institutional buildings.
However Authentic Josh
Sweat Jersey , as with many newly adopted technologies, questions
of how best to apply this product are being raised. One application issue in
particular is whether to apply an ERV as a stand alone unit on its own curb, or
as a bolt-on accessory to a rooftop air conditioning unit.
What is the
difference between the two systems? Although both systems require an exhaust air
stream as an energy source to pre-condition outdoor air, the primary difference
between the two systems is where the exhaust air is taken from. The drawings at
the right illustrate this difference and help visualize how the ERVs tie into
the HVAC ventilation system.
Some system designers may show a preference
for the bolt-on ERV. This may be because they perceive that the installation
cost will be lower Authentic
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responsibility for the ERV rooftop unit.
In most cases, a system design
that incorporates the stand alone ERV is superior to the bolt-on system. The
fundamental reasons for this can be found by taking a look at more than just the
outdoor air requirements. If we consider both the outdoor air and exhaust air
requirements of commercial buildings, the advantages of the stand alone system
become apparent.
The stand alone ERV system provides the most efficient
method of ventilating a building because it steals energy from air that has to
be exhausted anyway. The bolt-on ERV is not tied into the exhaust system
allowing the conditioned air to escape into the atmosphere. In many commercial
buildings, the exhaust air code required is roughly half of the outdoor air
volume. This means compared to the bolt-on unit Authentic
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twice as much air leaving the building. The net impact is nearly double the
effectiveness for the stand alone system.
To illustrate this point, let's
compare a stand alone unit to a bolt-on system based upon the following:
• A commercial building requires 3,000 cfm of outdoor air based on
ASHRAE Standard 62.
• Based on codes, the minimum exhaust is 1 Authentic
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conference rooms.
• The building is to have a slight positive pressure and
specifies total exhaustrelief air of 2,700 cfm (10% positive).
• Outdoor air
design point is 95db78wb and room air is specified at 75db 50% RH.
Combining outdoor air and exhaust air ventilation functions into a
single unit help drive an important practice in good HVAC design-building
ventilation balance. In layman's terms: What goes in must come out.
Traditionally, the outdoor air needs and the exhaust air needs were calculated
in separate thought processes. The designer would specify the minimum outdoor
air and exhaust air volumes required by code, but would stop short of comparing
the totals to check the ventilation balance. Frequently Authentic
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where doorways were transformed into wind tunnels. In some cases, buildings
became negatively pressurized and infiltration made indoor climate control
difficult.
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