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Duramax DuraCooler Keel
Cooler
increases heat transfer
by 17%. 
The Duramax DuraCooler patented streamlined header enhances interior coolant and exterior seawater flow patterns while reducing system pressure drop within the keel cooler unit.
We compared the heat transfer efficiency of the traditional square header design to
the streamlined header of the DuraCooler.
Through-Hull Nozzle Design
Nozzle size and diameter manufactured for specific
application. Two piece header design allows for braising on inside and outside
of the  header which, in turn, increases the integrity and reduces the chance
of leakage. Sea chest or cofferdam is required by
A.B.S. |
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Flange-Mount Design
This is for non-through-hull applications. Hardware
is located outside the hull for easy access. It is recommended when
space inside the hull is tight or equipment makes through-hull inaccessible.
No cofferdam or sea chest is needed. |
Benefits of the DuraCooler Keel Cooler.
Smaller footprint reduces costs
DuraCooler Streamlined design with increased coolant flow to the outside
tubes, can reduce the footprint of some units by as much as 42%. DuraCooler
units can be easily retrofitted to cool auxiliary engines and other
heat sources at a lower cost.
Lower installation cost and low
maintenance
DuraCooler one piece construction is compact, making it easy to install.
It’s built for long life and low maintenance, with high-strength 90/10
copper/nickel tubing that has excellent anti-fouling and heat transfer
properties. It also resists water-flow erosion.
Custom Engineered to fit your
exact needs
Your DuraCooler is custom-sized and manufactured to meet your engine
specifications, installation space, internal plumbing configurations
and operational requirements.
Coolant flow distribution to the outside tubes increased 35%
Heat rejection in the outer tubes increased 45%
Note: Study above conducted on a SC-48-96 and equivalent size square-head
unit.
Studies conducted by: Flow Simulations Inc. e-mail: info@flowsimulations.com
Overall heat transfer in the DuraCooler SC-48-96 increased by 17%
over the square-headed,
traditional design keel cooler unit tested
of equal size in initial testing.
In 1997, Duramax Marine initiated a research
and development program to identify opportunities to improve the operational
efficiency of the square-headed outboard keel cooler.
Finite element computer studies were conducted to determine internal
and external flow patterns, pressure drop and heat transfer characteristics
for different heat exchanger geometries.
 The traditional square header design system
was tested for inefficiencies.
Computer modeling showed poor coolant flow through tubes 1 & 8. It indicated
the outside tubes were being used least efficiently even though these tubes had
the greatest potential heat rejection per linear foot. Inefficiencies were attributed
to the geometric square head design.
Duramax Marine® began to develop a more efficient
streamlined header design.
It needed to enhance interior and exterior flow patterns and, at the same time,
reduce the overall pressure drop within the keel cooler unit. Resulting in a
more efficient unit with a smaller footprint.
The DuraCooler streamline header design was tested.
The tests conducted on the streamlined header design showed an increase of coolant
flow of 35% in the outside tubes, along with an increase of heat transfer in
the outside tubes by 45%.
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DuraCooler Keel
Cooler Brochure
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Cooler Installation Guide
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