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A piece of equipment built for
efficient heat transfer from one
medium to another.
A heat exchanger is a piece of equipment
built for efficient heat transfer from one
medium to another.
They are widely used in space heating,
refrigeration, air conditioning, power plants,
chemical plants, petrochemical plants,
petroleum refineries, natural gas processing
and sewage treatment.
In parallel-flow heat exchangers,
the two fluids enter the exchanger
at the same end, and travel in
parallel to one another to the
In counter-flow heat exchangers
the fluids enter the exchanger from
opposite ends. The counter current
design is the most efficient.
In a cross-flow heat exchanger,
the fluids travel roughly
perpendicular to one another
through the exchanger.
It is also known as concentric tube heat exchanger
In this heat exchanger the fluid to be cooled or
heated passes through the tube 2(green) and the
other fluid is passed through tube 1 (red)to absorb or
release the heat.
Advantages: Cheap for both design and maintenance.
Disadvantages: Low efficiency and requires large
One set of these tubes contains the fluid that must be
either heated or cooled. The second fluid runs over the
tubes that are being heated or cooled so that it can
either provide the heat or absorb the heat required.
They are typically used for high pressure
applications.(above 30 bars)
Cooling of hydraulic fluid.
Cooling of engine oils.
Cool or heat swimming pool water or charged
It is composed of multiple, thin, slightly separated
plates that have very large surface areas and fluid flow
passages for heat transfer.
The plates are often spaced by rubber sealing gaskets
which are cemented into a section around the edge of
the plates. The plates are pressed to form troughs at
right angles to the direction of flow of the liquid which
runs through the channels in the heat exchanger. These
troughs are arranged so that they interlink with the
other plates which forms the channel with gaps of 1.3–
1.5 mm between the plates.
The plates can be replaced after getting
If the temperature difference to be
accquired is to be increased then it can be
done by adding more plates.
A spiral heat exchanger (SHE), may refer to
a helical (coiled) tube configuration
Efficient use of space.
They can be easily cleaned.
A Spiral Heat Exchangers (or SHE) is a coiled tube
arrangement, with two channels coiled one around
the another. These two channels operate in a
counter-flow arrangement, offering excellent turn
down ratios, while optimising flow patterns which in
turn, enhance heat transfer.
Recuperators (Exhaust and Air Handling
Sludge Treatment (Thermal
High/low pressure limits
Product mix (liquid/liquid, particulates or
Pressure drops across the exchanger
Fluid flow capacity
Cleanability, maintenance and repair
Materials required for construction
Ability and ease of future expansion
Plate heat exchangers must be disassembled and cleaned
periodically. Tubular heat exchangers can be cleaned by
such methods as acid cleaning, sand blasting, high-
pressure water jet, bullet cleaning, or drill rods.
In large-scale cooling water systems for heat
exchangers, water treatment such as purification, addition
of chemicals, and testing, is used to minimize fouling of
the heat exchange equipment. Other water treatment is
also used in steam systems for power plants, etc. to
minimize fouling and corrosion of the heat exchange and