FIN FAN: Air fin cooler types and their applications

Forced draft air fin coolerAir forced across tube bundle by fan located in air plenum below bundle” Low HP Possibility of re circulation of hot air. Easy accessibility to motors. Lesser air distribution compared to induced draft. Parts:Fan, Nozzle, Fan ring, Plenum,Header, Tube bundle, Drive assembly,Inlet bell, Column support.

AIR FIN COOLER

“Air fin cooler are heat transfer equipment used for removing heat from process fluid to the atmosphere”.for:

  • cooling
  • condensing(By removing latent heat of vaporization)
  • Partial condensing

Air fin cooler assembly consists of :

  • Tube bundle for process fluid flow and heat transfer.
  • Fan assembly for providing air flow to remove heat.

Significance of air fin coolers :

No shell required, header ends similar shell & tube type.

Air velocity is typically 1.5 to 3.4 m/s.

Approach temp achieved practically is 8 to 14 deg c .

External fins provided on the tubes for increasing heat transfer area.

Application :

  1. High level of heat removal is required.
  2. Where cooling water not available.
  3. Where ambient temp is low.

Limitations:

  1. Problem of frequent fouling and corrosion.
  2. Higher investment.
  3. 4 to 10 times more ground space in shell & tube type.
  4. Low heat transfer coefficient of air results in large heat transfer area.

ADVANTAGE OF AIR FAN COOLERS

  • Eliminates high cost of cooling water treatment.
  • Reduced maintenance as water fouling properties are eliminate.
  • Independent of  water  supply location.
  • Temperature of process fluid can be controlled by varying the air flow through variable pitch fans, variable speed motor.

DIS-ADVANTAGE OF AIR FAN COOLERS

  • Air has poor heat transfer coefficient  hence, Air fan cooler occupy spaces.
  • Large moving part like fans, motors generating noise due to high air turbulence.
  • Moving parts increase maintenance costs.

                   Air forced draft cooler

TYPES OF AIR COOLED HEAT EXCHANGER

  1. Forced-draft
  2. Induced-draft
  3. Humidified forced-draft

Forced draft air fin coolers:

  • “Air forced across tube bundle by fan located in air plenum below bundle”
  • Low HP
  • Possibility of re circulation of hot air.
  • Easy accessibility to motors.
  • Lesser air distribution compared to induced draft.
  • Parts:Fan, Nozzle, Fan ring, Plenum,Header, Tube bundle, Drive assembly,Inlet bell, Column support.

Induced draft air fin coolers:

  • Fan located above hood covering tube bundle.
  • Air pulled across tube bundle and exhausted through hood.
  • Better and hot air is not re circulated.
  • Higher hp.
  • Fins protected.

Humidified forced-draft coolers:

Air humidified before forced across tubes.

Evaporation draws heat from air and cools air below temperature of process fluid.

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