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 Integrated
Chiller Economizer Technology is ideal for the chiller
replacement and design build markets. Legacy currently
offers Integrated Economizer Technology on forty
air-cooled and
water-cooled
condenser chiller models. These Integrated Economizer Systems
can reduce process cooling energy costs a much as 60%.
Target Markets:
Integrated Chiller Economizer Technology can be used in many
climate regions throughout North America and Europe. In early
2009, Legacy Chillers continues
Case Studies in several major
U.S. and Canada markets. Using data collected from these
case studies, Legacy Chillers had developed an MS XL based
Chiller Energy Audit Tool to help customers quickly determine
savings potential.
How Our Integrated Chiller
Economizer Works:
When chiller cooling is needed, the onboard Economizer
Controller begins to check outdoor air temperature on
approximately ten second intervals. If the outdoor air
temperature is approximately five degrees (F) cooler than process
fluid temperature, the Economizer Controller will be
automatically switching between four economizer states:
Mechanical
Cooling State: Outdoor air temperature has risen above the
Economizer deployment threshold temperature. While in this
operating condition, the Economizer Controller will stop
process fluid flow to the fluid (or dry) cooler and turn off
it outside air circulation fan(s).
Combination
State: Outdoor air temperature remains below the
Economizer deployment threshold. While in this operating
condition, the Economizer Controller will direct process fluid
to a remote mounted fluid (or dry) cooler. At the same time,
fluid (or dry) cooler fan(s) will be turned on. During the
call cycle, the Economizer Controller will attempt to maintain
desired process cooling setpoint using the economizer as much
as possible saving additional KWH.
Economizer
Cooling State: Outdoor air temperature remains below the
Economizer deployment threshold. Process load and outdoor
temperature conditions exists making it possible for the
Economizer to maintain the process cooling setpoint. While in
this operational state the Economizer Controller will lockout
mechanical cooling creating significant KWH reductions.
Chiller
De-ice State: When outdoor air temperature remains below
the Economizer deployment threshold for prolong periods of
time, by design the mechanical cooling system will be deployed
less. This can create opportunities for ice and snow to
build up within condenser fans causing damage to air-cooled
condenser fans. To address this potential problem, the
Economizer Controller allow mechanical cooling to run on
specially programmed intervals preventing damaging ice
buildup.
Alarm State:
In the event of a mechanical cooling system failure, the
process fluid temp will begin to rinse. Once the process fluid
increases to a point where Economizer cooling can be used, the
Economizer controller will automatically start taking over
full cooling until mechanical cooling can be repaired.
For
more information or an on-line presentation on how Legacy
Economizer system works, please contact or engineering office at
877-988-5464 x 101
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