What is a Shell and Tube Heat Exchanger?
A shell and tube heat exchanger consists of a bundle of tubes enclosed within a cylindrical shell. One fluid flows through the tubes (tube side) while the other fluid flows around the tubes within the shell (shell side). Heat transfers through the tube walls from the hotter fluid to the cooler fluid without the fluids mixing.
Shell and tube heat exchangers are the workhorses of process industries due to their robust construction, versatility, and ability to handle demanding conditions. They operate at high pressures and temperatures, accommodate large temperature differences, and tolerate fouling better than more compact designs. Shell and tube exchangers serve as condensers, reboilers, coolers, heaters, and process-to-process heat recovery units.
Compared to plate heat exchangers, shell and tube designs are larger for equivalent duty but handle higher pressures, higher temperatures, and more challenging fluids. The shell and tube configuration remains preferred for demanding chemical and petrochemical applications.
How Does a Shell and Tube Heat Exchanger Work?
Tube Side Flow
Fluid enters the tube side through a tube sheet head, distributes across the tubes, flows through the tube bundle, and exits through the opposite head. For multi-pass designs, baffles in the heads direct fluid through the tubes multiple times, increasing heat transfer effectiveness. Tube side typically handles the fluid that is more corrosive, fouling, or at higher pressure.
Shell Side Flow
The second fluid enters the shell and flows across and along the tube bundle. Baffles within the shell direct flow back and forth across the tubes, increasing turbulence and heat transfer. The shell side fluid contacts the outside of all tubes, exchanging heat through the tube walls.
Counter-Current and Co-Current Flow
Shell and tube exchangers typically operate with counter-current flow—fluids moving in opposite directions—for maximum temperature driving force. Co-current (parallel) flow may be used when limiting temperature approach is necessary. Multi-pass designs create complex flow patterns optimising heat transfer.
Types of Shell and Tube Heat Exchangers
Fixed Tube Sheet Heat Exchangers
Fixed tube sheet designs have tube sheets welded to the shell at both ends. This simple construction suits applications with limited temperature differential between tube and shell sides. Fixed tube sheet exchangers are economical but cannot accommodate significant differential thermal expansion.
U-Tube Heat Exchangers
U-tube designs use tubes bent into U-shapes with both tube ends in the same tube sheet. This configuration allows the tube bundle to expand and contract freely, accommodating large temperature differences. U-tube exchangers are common for steam condensing and high-temperature applications.
Floating Head Heat Exchangers
Floating head designs allow one tube sheet to move within the shell, accommodating thermal expansion while permitting tube bundle removal for cleaning and inspection. This versatile design suits fouling applications requiring periodic maintenance access.
Shell and Tube Heat Exchanger Applications
Condensers
Shell and tube condensers cool vapours to liquid by removing latent heat. Common applications include condensing overhead vapours from distillation columns, recovering solvents from dryers, and condensing steam for heat recovery. Cooling water or other cooling media flows through the shell or tube side depending on design.
Reboilers
Shell and tube reboilers provide heat to distillation column bottoms for generating vapour. Steam or hot oil heats the process fluid, creating the vapour flow essential for distillation separation. Kettle reboilers and thermosyphon reboilers serve different distillation requirements.
Process Heaters and Coolers
Shell and tube exchangers heat and cool process streams throughout facilities. They raise feed temperatures to reaction conditions, cool products for storage, and recover heat between process streams. Chemical-resistant materials handle demanding process fluids.
Utility Systems
Shell and tube exchangers serve utility systems including steam generation, cooling water systems, and thermal oil circuits. Their robust construction provides reliable operation in demanding industrial environments.
Shell and Tube Heat Exchanger Manufacturers at Foeth
Kelvion – Shell and tube heat exchangers for industrial and process applications
Alfa Laval – Heat exchangers for marine, process, and industrial applications
GEA – Shell and tube and plate heat exchangers for diverse industries
Funke – Heat exchangers for chemical and industrial applications
Bowman – Shell and tube heat exchangers for industrial cooling
APV – Process heat exchangers for food and pharmaceutical
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