ESW - Surplus Used Equipment

E NERGY E FFICIENT L OW S OUND
The ESW line of closed circuit coolers represents
Evapco’s continuous commitment to developing
innovative products which surpass industry standards
and expectations. This time, Evapco has added super
efficiency and low sound to the serviceability benefits
of Evapco’s Advanced Technology product line.
Low Energy As Standard
The ESW stands apart as being the most energy
efficient closed circuit cooler ever. This efficiency, in
terms of lower fan horsepower, translates directly to
lower operating costs…significantly lower operating
costs. With the ESW installed, customers can realize
immediate energy savings which continue each and
every year for the life of the equipment.
• Replace inefficient units:
The potential for energy savings alone is often
enough to justify replacing inefficient fluid coolers
with high efficiency models. As an example, a 250
ton centrifugal fan fluid cooler with 80 HP worth of
fan motors can be replaced by an ESW model with a
fan motor size of only 15HP. This tremendous
reduction in fan motor size offers annual savings of
$16,530 per year based on 3,500 hours of operation
and an electric rate of $0.09/kwhr.
• New Product Comparison:
When comparing the cost of new equipment,
energy efficiency and consumption are important
factors for determining the total product cost.
Units having a lower first cost but higher energy
requirement are more expensive to operate and
normally end up costing the customer more over
the life of the equipment.
Annual Savings ($)
Annual Savings ($)
12,000
10,000
8,000
6,000
4,000
2,000
35,000
30,000
25,000
20,000
15,000
10,000
5,000
20 HP Reduction
15 HP Reduction
10 HP Reduction
0
1500 2500 3500 4500 5500 6500 7500 8500
Hours of Operation
65 HP Reduction
50 HP Reduction
40 HP Reduction
30 HP Reduction
0
1500 2500 3500 4500 5500 6500 7500 8500
Hours of Operation
Annual savings based on fan motor efficiency = 0.924 and energy cost cost of of $0.09/kWh
Low Sound As Standard
In addition to being the most energy efficient, the ESW is also the
quietest axial fan fluid cooler. The removable access panels around
the base of the unit block water noise to the point where casual
conversation is possible at only five feet from the air inlet…even
with the fan running on high speed. And at a distance of five
feet above the fan, the ESW has sound levels that are up to
13dBA less than other axial fan fluid coolers of equal capacity.
Research and Development
Through an ongoing program of research and development,
Evapco dissects and analyses the key elements of heat transfer.
With regards to cooling towers, the thin film of water that is
created across the fill surface readily gives up heat in a "latent"
exchange to the air passing over the fill. Recent advances in
counterflow fill technology such as the EVAPAK ® fill have raised
cooling tower performance to unprecedented levels.
Closed circuit cooler performance has also improved over the years
with the advent of new technologies such as Evapco’s patented
Thermal-Pak ® coil. However, the large advances in performance of
closed circuit coolers has not been as good as open towers because
an additional stage of heat transfer is involved, and because the
tube bundles are not as effective as fill in terms of latent heat
transfer. However, research has shown that under the right
conditions, a tube bundle can be extremely efficient for
transferring heat in the "sensible" form.
Considering these principals of heat transfer, it became
apparent that an optimized combination of these technologies
could produce a closed circuit cooler with efficiency levels that
had not yet been realized. It also became apparent that such a
combination would fit perfectly within the proven framework
of Evapco’s flagship offering...the Advanced Technology
product line.
Patented Optimized Technology* with
†
CTI Certified Performance
Evapco is the first manufacturer to develop a closed circuit
cooler with Patented Optimized Technology ® . The performance
of the fill section is optimized with counterflow heat transfer
and a flow rate of 6 gpm per square foot. At 6 gpm per square
foot, the water flows slowly through the fill layers with
maximum time for exposure to the cooling air.
After leaving the fill section, the water focuses on the coil at a
rate of 12 gpm per square foot…the highest flow over a coil in
the industry! At 12 gpm per square foot, the coil is completely
flooded with all heat being stripped from the coil by sensible
heat transfer.
With Optimized Technology ® providing maximum heat transfer
through the fill and across the coil, the ESW has been designed
for low energy, enabling customers to benefit from lower
operating costs each and every year.
Other benefits of this unique counterflow design:
• The coil is easily piped at ground level.
• The coil is easily inspected and accessible at ground level via
removable cover panels around the unit.
• Discharge hood with dampers not required...the sheltered
enclosure around the coil reduces heat loss and eliminates
natural drafts across the coil.
*U.S. Patent #6598862
† Mark owned by the Cooling Technology Institute
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