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High efficiency fin design
Inherent advantages
include a reduction in overall size and heat transfer surface requirements
for a specific cooling duty. Conversely, a similar sized cooling section
using the high performance fin will require either less air flow thereby
reducing power costs or will provide increased cooling capacity. This is an
important factor when replacing older tube bundle sections.
The High Performance Fin design offers up to 25% greater heat transfer than
the conventional plain fin design. A spiral, L-foot or shoulder-type fin with
radial openings achieves superiority over the plain smooth fin by
substantially reducing required heat transfer surface while incorporating the
strength and non-clogging characteristics of a smooth fin.
Why and How
When any fluid passes over a surface, a stagnant fluid layer or film builds
up adjacent to the surface which it is in contact. The greater the contact
area and/or longer contact length the greater the stagnant layer becomes. In
similar fashion, air passing over a plain or smooth fin surface forms a
stagnant air film that reduces thermal conduction and lowers the rate of heat
transfer from fin to the atmosphere. The High Performance Fin's interrupted
surface through its radial openings, prevents this stagnant film of air from
reaching its maximum thickness thus increasing the outside film transfer
coefficient. Most importantly, it does not increase the turbulence of the air
passing over the fins and the result is an increase in overall heat transfer
rate without an increase in static pressure or fan horsepower.
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