Reliability
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Finned Tubes

The efficiency of air-cooled heat exchangers primarily depends on the heat transfer capabilities of the finned tubes. Important factors to be considered include design temperatures, operating environment and whether or not the cooler will be exposed to cyclical service.

L and Overlapped L Fins

Application:   

The L fin design is for design temperatures less than 300 degrees Fahrenheit.  This fin offers a certain degree of atmospheric protection of the tube wall against corrosion. The broad contact surface between the tube and the finning enhances heat trasnfer.  This fin design is the most economical.

The overlapped L fin design is for customers who want an increased level of tube coverage.  The foot of the L fin is simply overlapped onto the previous L foot.  This results in a slightly higher level of tube corrosion protection and allowable design temperature.

Fabrication:

This fin is created by forming an aluminum strip into an L-shape which is then tension wound around the primary tube.  Each L section is positioned against each other to ensure complete tube coverage.  Also this manufacturing technology allows the use of relatively thin walled tubes. 

  
L-Tube 

Fin Material: Aluminum

Tube Material: Any metal

L Fin Design Temp: <300°F

Overlap-L Design Temp: <350°F

Embedded Fin

Application:   

The Embedded fin is designed for high temperature and / or cyclical applications.

Fabrication:   

The aluminum strip is tension-wound and placed into a toleranced groove cut into the tube, then held in place by the tube material displaced on both sides.

 

  
G-Tube 

Fin Material: Aluminium

Tube Material: Any metal suitable for easy mechanical processing

Working temperature: <750°F

Extruded Fin

Application:

Typically extruded fins are used in corrosive atmospheric conditions, such as off-shore applications, or at operating temperatures less than 550 degrees Fahrenheit.  This fin design is the least economical as compared to the other fin types, primarily due to the increased amount of aluminum used (~40%) and the increased labor required to manufacture.  However this increased cost can be offset if a lower grade parent tube material is used.

Fabrication:   

The extruded fin is manufactured by compressing an aluminum bloom, or sleeve, onto the parent tube.  The bloom is exposed to extremely high pressures which essentially "grows" the fins into the final fin profile.The process produces an extremely strong joint with excellent heat transfer capabilities.

  
Bimetal-Tube 

Fin Material: Aluminium

Tube Material: Any metal

Working temperature: <550°F

 

 
Air Cooled Heat Exchanger Brochure
GEA Rainey Solutions
5202 West Channel Road
Catoosa , OK 74015
Phone:
(918) 266-3060
Fax: (918) 266-2464
Inquiries:  aircoolers
Service:    serviceparts