Transcript DESIGN OF SHELL AND TUBE HEAT EXCHANGER BY-RAHUL OMARB.TECH.F(CH) Heat Exchanger Includes    Shell Tubes Working fluids.

DESIGN OF SHELL AND TUBE
HEAT EXCHANGER
BY-RAHUL OMAR
0616651020
B.TECH.F(CH)
Heat Exchanger Includes
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Shell
Tubes
Working fluids
Heat Exchanger Shell
More expensive to manufacture than
tubes
 Material
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Heat Exchanger Tubes
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Number of tubes
Tube wall thickness
Tube outside diameter
Tube length
Tube passes
Tube material
Tube layout
Tube pitch
Heat Exchanger Tubes
Number of tubes
• Depends on flow rate & available
pressure drop
• Too many/few tubes
 Tube wall thickness
• All tubes have standards
 Tube outside diameter
• Small diameter means larger pressuredrop
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Tube length
• Typical lengths – 8, 12, 15, 20 ft.
 Tube passes
• Number of times fluid moves from
one
 side of HE to other
• The more passes the greater the
velocity
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Tube material
• Meeting requirements
• Cost
• Thermal properties
 Tube layout
• Square
 Tube pitch
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Heat Exchangers Fluids
Viscous fluids belong on shell side
because usually improves heat
transfer rate
 Fouling and erosion exist; higher
velocity of fluid reduces build-up
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Problem Statement
4500kg/hr of ammonia vapour at 6.7 bar
pressure is to be cooled from 1200C to 400C,
using cooling water.The maximum supply
temp. of cooling water available is 300C &the
outlet temp. is to be restricted to 400C.The
pressure drop over the exchanger must not
exceed 0.5 bar for the ammonia stream & 1.5
bar for the cooling water.