A heat exchanger is a device that transfers heat between two or more fluids. There are several types of heat exchangers, including parallel-flow, counter-flow, cross-flow, double pipe, shell and tube, plate, and spiral. Heat exchangers are widely used in applications like heating, cooling, chemical processes, and power generation to efficiently exchange heat between fluids. Proper selection and maintenance of heat exchangers depends on factors such as temperature ranges, pressure, materials, fouling potential, and cleanability.

1. A piece of equipment built for
efficient heat transfer from one
medium to another.

2.  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.

3.  In parallel-flow heat exchangers,
the two fluids enter the exchanger
at the same end, and travel in
parallel to one another to the
other side.

4.  In counter-flow heat exchangers
the fluids enter the exchanger from
opposite ends. The counter current
design is the most efficient.

5.  In a cross-flow heat exchanger,
the fluids travel roughly
perpendicular to one another
through the exchanger.

6.  Double pipe heat exchanger
 Shell and tube heat exchanger
 Plate heat exchanger
 Plate and shell heat exchanger
 Adiabatic wheel heat exchanger
 Plate fin heat exchanger
 Pillow plate heat exchanger
 Fluid heat exchangers
 Waste heat recovery units
 Dynamic scraped surface heat exchanger
 Direct contact heat exchangers
 HVAC air coils
 Spiral heat exchangers

7.  Double pipe heat exchanger
 Shell and tube heat exchanger
 Plate heat exchanger
 Plate and shell heat exchanger
 Adiabatic wheel heat exchanger
 Plate fin heat exchanger
 Pillow plate heat exchanger
 Fluid heat exchangers
 Waste heat recovery units
 Dynamic scraped surface heat exchanger
 Direct contact heat exchangers
 HVAC air coils
 Spiral heat exchangers

8.  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
space.

10.  Pasteurization
 Digester heating
 Heat recovery
 Pre-heating
 Effluent cooling.

11.  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)

13.  Cooling of hydraulic fluid.
 Cooling of engine oils.
 Cool or heat swimming pool water or charged
air.

14.  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.

16.  The plates can be replaced after getting
corroded.
 If the temperature difference to be
accquired is to be increased then it can be
done by adding more plates.

17.  Water heaters
 Cooling tower isolation
 Free cooling
 Waste heat recovery
 Heat pump isolation
 Thermal (ice) storage systems

18.  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.

20.  Pasteurization
 Recuperators (Exhaust and Air Handling
Systems)
 Sludge Treatment (Thermal
depolymerisation)

21.  Cost
 High/low pressure limits
 Thermal performance
 Temperature ranges
 Product mix (liquid/liquid, particulates or
high-solids liquid)
 Pressure drops across the exchanger
 Fluid flow capacity
 Cleanability, maintenance and repair
 Materials required for construction
 Ability and ease of future expansion

22.  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
other equipment.

23. Presented By:-
Devidas Barge
Pratik Dalvi
Gopesh Chilveri
Aniket Dupade