DESIGN OF SHELL AND TUBE HEAT EXCHANGER

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DESIGN OF SHELL AND TUBE HEAT EXCHANGER

• BY-RAHUL OMAR
• 0616651020
• B.TECH.F(CH)

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Heat Exchanger Includes

• Shell
• Tubes
• Working fluids

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Heat Exchanger Shell

• More expensive to manufacture than
• tubes
• Material

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Heat Exchanger Tubes

• Number of tubes
• Tube wall thickness
• Tube outside diameter
• Tube length
• Tube passes
• Tube material
• Tube layout
• Tube pitch

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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.