King Saud University King Saud University College engineering College engineering

Chemical departmentChemical department

Air-Cooled heat Exchanger

Name: Mohammed Othman Al-zahrani ID:426104592 Dr. Malek

INTRODUCTIONINTRODUCTION::Many industrial facilities are required to meet stringent noise requirements. These requirements areimposed to protect workers’ hearing and/or to meet community ordinances. The facilitydesigner must pay careful attention to the noise level of all industrial equipment, includingair-cooled heat exchangers.Measurements for community noise requirements are made at the plant boundary or nearest residencein the far field of the heat exchanger. The far field is defined as the region where there is a linearrelationship between the sound pressure level measured and the distance from the noise source.

Why use an air-cooled heat exchanger?

Air-cooled heat exchangers are generally used where a process system generates heat which must be removed, but for which there is no local use. A good example is the radiator in your car. The engine components must be cooled to keep them from overheating due to friction and the combustion process. The excess heat is carried away by the water/glycol coolant mixture. A small amount of the excess heat may be used by the car's radiator to heat the interior. Most of the heat must be dissipated somehow. One of the simplest ways is to use the ambient air. Air-cooled heat exchangers (often simply called air-coolers) do not require any cooling water from a cooling tower. They are usually used when the outlet temperature is more than about 20 deg. F above the maximum expected ambient air temperature. They can be used with closer approach temperatures, but often become expensive compared to a combination of a cooling tower and a water-cooled exchanger

Air Cooled Heat Exchangers

Carbon Steel & Stainless Steel Tube bundles assembled for shop run test

Air Cooled Heat Exchanger installed in the Kerosene Recovery Unit at Hazira,

India

Materials of Materials of ConstructionConstruction-:-:

1 (Carbon steel with or without NACE requirement and/or HIC testing.2) Chromium molybdenum (chrome-moly) alloy steel.3) Stainless steel alloys.4) Duplex stainless steel alloys.5) Incolloy material

Operation:

Fine control of process outlet temperature is achieved by the individual or combination of the following methods of control.

1) Auto variation of fan blade angle.2) Auto variation of louver blade angle.3) Variable speed drive system for fan speed control

Finned Tube Details

FE Tube XE Tube L Tube

K Tube G-Fin Tube FE Tube

Welded Header

Screw – Bolted Header with Cover

Studded Header with Cover

Plug- Type Header

Reference:

1) process heat transfer

-G.F Hewitt -G.L Shires-T.R.Bott2)Rules of Thumb-Carl .B

3) heat Exchanger

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