A Heat Exchanger is a piece of equipment built for efficient heat transfer from one medium to
another. Heat exchangers are used
for the transfer of heat or cold between two fluids for the purpose of heating
the process, cooling the process or condensing vapours during the process. Heat
Exchangers can also be known as Condensers, are pressure and temperature rated
and can be horizontally or vertically orientated. They are widely used in space heating, refrigeration, air conditioning, power plants, chemical plants, petrochemical plants, petroleum refineries, natural gas
processing, and sewage treatment. The classic example of a Heat
Exchanger is found in an internal
combustion engine in which a circulating fluid known as engine coolant flows through radiator coils and air flows past the coils, which cools the coolant and heats
the incoming air.
There are several
different types of Heat Exchangers in the process industry. These include: shell
and tube, plate, spiral and air cooled and compoblock Heat Exchangers. A
shell and tube Heat Exchanger has an external cylinder called a shell with
internal tubes that run the length of the shell. There are tube sheets on each
end of the tubes sealing the shell around the tubes and there are covers on
each end called heads which can come in several configurations. Basic principal
of operation is that one fluid flows through the tube and the other fluid flows
around the tubes; the large number of tubes in the bundles offer extensive contact
surfaces which facilitate quick and efficient thermal transfer. The fluid inside the tubes can flow in a
single pass or multiple passes using baffles in the heads. Another type of heat
exchanger is the plate Heat Exchanger. One is composed of
multiple, thin, slightly separated plates that have very large surface areas
and fluid flow passages for heat transfer. This stacked-plate arrangement can
be more effective, in a given space, than the shell and tube Heat Exchanger.
There are three primary flow arrangements with Heat
Exchangers: counter-flow, parallel-flow, and cross-flow. In the counter-flow
exchanger, the fluids enter the exchanger from opposite sides. This is the most
efficient design because it transfers the greatest amount of heat. In the
parallel-flow version, the fluids come in from the same end and move parallel
to each other as they flow to the other side. The cross-flow Heat Exchanger
moves the fluids in a perpendicular fashion.
Heat
Exchangers at Perry:
Perry Process Equipment Ltd are the
largest stockists of used Heat Exchangers and Condensers for use in the
chemical, pharmaceutical and food industries and can save you up to 70% when
compared to the cost of a new unit. We have been buying and selling used
equipment for over 80 years, so you can trust our expertise.
We have 100s of used Heat Exchangers in
stock including air cooled, fin tube, plate type, karbate, scraped
surface, shell & tube, spiral heat, tube in tube, alloy, carbon and stainless
steel. Our Heat Exchangers are available in horizontal or vertical orientation,
in many diameters, dimensions and capacities.
You can find a wide range of high quality Heat Exchangers at our Newton
Aycliffe site, from
manufacturers including Aset,
Thies, APV, Johnson Hunt, SSC, Zeta, Applied Fusion, Alfa Laval and Canzler.
To learn more about NEW
Heat Exchangers manufactured by our affiliate, Perry Products Corp, whether in
stock or fabricated to your specifications, click
here to go to the Perry Products site.
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