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Shell and
Tube Heat Exchangers are simple devices with no moving parts which
function on the principal that heat is exchanged between one fluid or
vapor flowing through the tubes and another fluid or vapor flowing in
the space around the tubes within the shell.
There are four basic considerations in choosing a mechanical
arrangement that provides for efficient heat transfer between the two
fluids or vapors, while taking care of such practical matters as
preventing leakage from one into the other.
These are:
• Consideration for differential thermal expansion of tube and shell
• Means of directing fluid through the tubes
• Methods of controlling fluid flow through the shell
• Consideration for ease of maintenance and servicing
Various types of heat exchangers have been developed with different
approaches to these fundamental design factors. The following will
show how the three principal types of heat exchangers meet these
design basics. |
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