DESIGN OF SHELL AND TUBE HEAT EXCHANGER BY-RAHUL OMARB.TECH.F(CH) Heat Exchanger Includes Shell Tubes Working fluids.
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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
Shell
Tubes
Working fluids
Heat Exchanger Shell
More expensive to manufacture than
tubes
Material
Heat Exchanger Tubes
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
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
Tube material
• Meeting requirements
• Cost
• Thermal properties
Tube layout
• Square
Tube pitch
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
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.