A shell and tube heat exchanger transfers heat between two fluids using tubes contained within a cylindrical shell, designed for large capacity applications up to 5000 kW with robust construction. One fluid flows through tubes while the second flows around tubes in the shell, creating efficient heat transfer across a large surface area. These exchangers are standard in district heating systems, large HVAC installations, and industrial applications.
Technical Details
Shell and tube exchangers contain 10-1000+ tubes ranging from 10-25 mm diameter and 1-4 meters in length. Design pressures reach 3000 kPa in high-pressure applications. Heat transfer coefficients range from 1000-5000 W/m²°C depending on fluid properties and flow rates. Tube materials include copper, brass, stainless steel, and titanium for corrosive environments. Pressure drop through tubes typically measures 30-150 kPa. Thermal effectiveness reaches 60-85% depending on flow configuration and number of tube passes.
Applications and Practical Significance
Shell and tube exchangers excel in high-capacity heating and cooling applications serving large buildings and industrial processes. They handle high pressure differentials and accommodate both liquid and phase-change fluids. Tube cleaning every 2-3 years through mechanical or chemical methods maintains performance. These units are cost-effective at capacities exceeding 250 kW due to lower per-unit cost than plate exchangers.