DESIGN OF SHELL AND TUBE HEAT EXCHANGER BYRAHUL
DESIGN OF SHELL AND TUBE HEAT EXCHANGER BY-RAHUL OMAR 0616651020 B. TECH. F(CH)
Heat Exchanger Includes n n n Shell Tubes Working fluids
Heat Exchanger Shell More expensive to manufacture than tubes n Material n
Heat Exchanger Tubes n n n n 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 n Tube wall thickness • All tubes have standards n Tube outside diameter • Small diameter means larger pressuredrop n
Tube length • Typical lengths – 8, 12, 15, 20 ft. n Tube passes • Number of times fluid moves from one n side of HE to other • The more passes the greater the velocity n
Tube material • Meeting requirements • Cost • Thermal properties n Tube layout • Square n Tube pitch n
Heat Exchangers Fluids Viscous fluids belong on shell side because usually improves heat transfer rate n Fouling and erosion exist; higher velocity of fluid reduces build-up n
Problem Statement 4500 kg/hr of ammonia vapour at 6. 7 bar pressure is to be cooled from 1200 C to 400 C, using cooling water. The maximum supply temp. of cooling water available is 300 C &the outlet temp. is to be restricted to 400 C. 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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