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Classification Of Heat Exchangers

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Classification Of Heat Exchangers
Introduction
Heat: is energy in transit from one mass to another because of a temperature difference between
the two. A form of energy associated with the motion of atoms or molecules and transferred from
a body at a higher temperature to one at a lower temperature. Heat energy will move from a high
energy state to that of a lower energy state. The process will continue until a state of equilibrium
is reached. Equilibrium is the energy state where the material is at the same energy level as its
surroundings.
A heat exchanger is defined as device used to transfer thermal energy (enthalpy) between two or
more fluids, between the solid surface and a fluid. The fluids can be single compounds or
mixtures. The typical applications of heat exchangers include cooling or heating of fluid stream
of concern, evaporation or condensation of multi-component or single fluid stream. They are also
used in heat rejection or heat recovery from a system.
The heat exchanger:
Is a piece of equipment built for efficient heat transfer from one medium to another? The media
may be separated by a solid wall, so that they never mix, or they may be in direct contact.
Heat exchangers are found in most chemical or mechanical systems. They serve as the system's
means of gaining or rejecting heat. Some of the more common applications are found in heating,
ventilation and air conditioning (HVAC) systems, radiators on internal combustion engines,

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boilers, condensers, and as pre-heaters or coolers in fluid systems. This unit will review some
specific heat exchanger applications
Heat exchangers consists of the heat exchanging elements such as matrix or core containing heat
transfer surface and the fluid distribution elements such as manifolds, headers, tanks, seals, or
pipes. Normally, there are no moving parts in the heat exchangers. The exceptions are in rotary
regenerator (where the matrix is driven mechanically to rotate at some given speed)
Classification
Heat exchangers can be classified according to the transfer process, flow arrangement,
construction, surface compactness, heat transfer mechanisms, and number of fluids. In this
article, the heat exchangers are classified in heat transfer process. In addition, brief description is
provided for each classification along with the selection criteria. The following are the main
types:
Shell and Tube Heat Exchangers
These are tubular heat exchangers that are widely used in the industry for a number of reasons.
They can be custom designed for virtually any operating conditions and capacity, such as from
high vacuums to the ultra-high pressures (over 100 MPa). They are limited only by materials of
construction. These exchangers can be designed for the special operating conditions such as
heavy fouling, vibration, highly viscous fluids, corrosion, erosion, radioactivity and multi-
component mixtures and so on. These are versatile exchangers that are made from broad range of
materials (metal and non-metal) and in different sizes. They are widely used as process heat
exchangers in chemical industries and petroleum-refining; as condensers, steam generators, oil
coolers in the power plants, boiler feed water heaters, refrigeration applications.

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Classification Of Heat Exchangers Introduction Heat: is energy in transit from one mass to another because of a temperature difference between the two. A form of energy associated with the motion of atoms or molecules and transferred from a body at a higher temperature to one at a lower temperature. Heat energy will move from a high energy state to that of a lower energy state. The process will continue until a state of equilibrium is reached. Equilibrium is the energy state where the material is at the same energy level as its surroundings. A heat exchanger is defined as device used to transfer thermal energy (enthalpy) between two or more fluids, between the solid surface and a fluid. The fluids can be single compounds or mixtures. The typical applications of heat exchangers include cooling or heating of fluid stream of concern, evaporation or condensation of multi-component or single fluid stream. They are also used in heat rejection or heat recovery from a system. The heat exchanger: Is a piece of equipment built for efficient heat transfer from one medium to another? The media may be separated by a solid wall, so that they never mix, or they may be in direct contact. Heat exc ...
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