King Saud University
College engineering
Chemical department
Air-Cooled heat Exchanger
Name: Mohammed Othman Al-zahrani
ID:426104592
Dr. Malek
INTRODUCTION:
Many industrial facilities are required to meet stringent noise requirements. These
requirements are
imposed to protect workers’ hearing and/or to meet community ordinances. The facility
designer must pay careful attention to the noise level of all industrial equipment, including
air-cooled heat exchangers.
Measurements for community noise requirements are made at the plant boundary or
nearest residence
in the far field of the heat exchanger. The far field is defined as the region where there is
a linear
relationship 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 Construction: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
K Tube
XE Tube
G-Fin Tube
L 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.Bott
2)Rules of Thumb
-Carl .B
3) heat Exchanger
The end