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HEAT
EXCHANGER DESIGN AND CONSTRUCTION
Heat exchanger, as the name called is equipment used for exchanging heat from
one source to another.
They are present everywhere around us. The automobile radiator is a special Heat
Exchanger used for exchanging heat from water with air. The hot water geyser
used in bathrooms employ a coil in which water is circulated and picks up heat
from electrical element, is also a special type of Heat Exchanger Industrial
boiler which exchanges heat from fuel like coal or oil to water for conversion
of water to steam is also a special type of heat exchanger.
However, in industrial application, Heat exchanger normally has special
significance and is called so when heat is exchanged between two fluids (gases
or liquid). The heat exchanger is called as a CONDENSER when one of the fluids
present in the exchanger changes phase during the operation i.e. one of the
fluids either turns from gas to liquid or vice-a-versa.
A simplest form of Heat Exchanger is double pipe Heat Exchanger where two pipes
are constructed one inside the other. One fluid flows in each of the pipes and
gets heated/ or cooled as per the application.
TUBE AND SHELL Heat Exchanger. There are several other designs possible, the
most common one being SHELL AND TUBE type of Heat Exchanger. This design is
employed in more than 90% of the industrial applications. The shell and tube
type of Heat Exchanger as the name suggests, has a shell in which there is a
bundle of tube. Both the shell and the tubes are separated plates. One fluid
flows through tubes and other through shell and exchanger energy (heat), while
one liquid is cooled the other is heated. This is very important for us to study
as most of the A/c plants incorporate this type of design for cooling of
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Introduction |
Combined heat transfer process |
Heat transfer in cooling tower |
Variables affecting performance of CT heat transfer |
Heat transfer within
cooling system (heat exchanger) |
Types of heat exchanger |
Basic design
procedure and theory |
Designing a test heat exchanger |
Log Mean Temperature
difference | L.M.T.D. Correction factors |
Overall heat transfer coefficient |
Elaborated method for calculating U values |
Effect of scale formation |
Condensation of steam |
Condenser, where the hot fluid temperature varies |
Significance of pressure |
Significance of flow rate |
Methods of checking steam
condenser performance |
Common conversion factors
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