Heat exchanger with transpired, highly porous fins

Patent · Tue Jan 01 00:00:00 EST 2002

OSTI ID:874378

Kutscher, Charles F ^[1]; Gawlik, Keith ^[2]

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1. Golden, CO
2. Boulder, CO

The heat exchanger includes a fin and tube assembly with increased heat transfer surface area positioned within a hollow chamber of a housing to provide effective heat transfer between a gas flowing within the hollow chamber and a fluid flowing in the fin and tube assembly. A fan is included to force a gas, such as air, to flow through the hollow chamber and through the fin and tube assembly. The fin and tube assembly comprises fluid conduits to direct the fluid through the heat exchanger, to prevent mixing with the gas, and to provide a heat transfer surface or pathway between the fluid and the gas. A heat transfer element is provided in the fin and tube assembly to provide extended heat transfer surfaces for the fluid conduits. The heat transfer element is corrugated to form fins between alternating ridges and grooves that define flow channels for directing the gas flow. The fins are fabricated from a thin, heat conductive material containing numerous orifices or pores for transpiring the gas out of the flow channel. The grooves are closed or only partially open so that all or substantially all of the gas is transpired through the fins so that heat is exchanged on the front and back surfaces of the fins and also within the interior of the orifices, thereby significantly increasing the available the heat transfer surface of the heat exchanger. The transpired fins also increase heat transfer effectiveness of the heat exchanger by increasing the heat transfer coefficient by disrupting boundary layer development on the fins and by establishing other beneficial gas flow patterns, all at desirable pressure drops.

• Research Organization: Midwest Research Institute, Kansas City, MO (United States)
• DOE Contract Number: AC36-99GO10337
• Assignee: Midwest Research Institute (Kansas City, MO)
• Patent Number(s): US 6378605
• OSTI ID: 874378
• Country of Publication: United States
• Language: English

Related Subjects

heat
exchanger
transpired
highly
porous
fins
tube
assembly
increased
transfer
surface
positioned
hollow
chamber
housing
provide
effective
gas
flowing
fluid
fan
included
force
air
flow
conduits
direct
prevent
mixing
pathway
element
provided
extended
surfaces
corrugated
form
alternating
ridges
grooves
define
channels
directing
fabricated
conductive
material
containing
numerous
orifices
pores
transpiring
channel
closed
partially
substantially
exchanged
front
interior
significantly
increasing
available
increase
effectiveness
coefficient
disrupting
boundary
layer
establishing
beneficial
patterns
desirable
pressure
drops
heat exchanger
heat transfer
fluid flow
gas flow
conductive material
tube assembly
highly porous
increased heat
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