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DESIGN OF SHELL AND TUBE HEAT EXCHANGER

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

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DESIGN OF SHELL AND TUBE HEAT EXCHANGER

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  1. DESIGN OF SHELL AND TUBE HEAT EXCHANGER BY-RAHUL OMAR 0616651020 B.TECH.F(CH)

  2. Heat Exchanger Includes • Shell • Tubes • Working fluids

  3. Heat Exchanger Shell • More expensive to manufacture than tubes • Material

  4. Heat Exchanger Tubes • Number of tubes • Tube wall thickness • Tube outside diameter • Tube length • Tube passes • Tube material • Tube layout • Tube pitch

  5. 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

  6. 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

  7. Tube material • Meeting requirements • Cost • Thermal properties • Tube layout • Square • Tube pitch

  8. 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

  9. 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.

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