Shell and Tube Heat Exchanger: The Powerful Center of Industrial Heat Transfer

One of the most critical pieces of equipment in industrial facilities, the **shell and tube heat exchanger**, is a system that allows two fluids at different temperatures to transfer heat across a wide surface area without mixing. The shell and tube heat exchangers we design as Fintherm are known for their superior performance under high pressure (350 bar shell, 1400 bar tube) and extreme temperature (200°C – 600°C) conditions. These exchangers offer thermal shock-resistant and long-lasting solutions in a wide range of applications, from oil refineries to food factories. The basic operating principle of the system is that one fluid flows through the inside of the tubes (**tube side**), while the other fluid flows through the shell surrounding these tubes (**shell side**). To maximize heat transfer, **corrugated** or **turbulator** tube technologies are utilized inside the tubes.

Structure and Basic Components of Shell and Tube Heat Exchangers

Fintherm shell and tube heat exchangers are manufactured in accordance with international standards (TEMA, ASME, EN 13445) consisting of three main parts:

• Front Header (Stationary Head): The section that regulates the entry of the fluid into the tube side.
• Shell: The cylindrical structure surrounding the tube bundle where the shell-side fluid circulates. Expansion joints (bellows) used to absorb thermal expansion are located in this part.
• Rear Head: The section where the fluid completes the tube circuit or makes a return.
• Tube Bundle and Tube Sheets: Perforated plates (tube sheets) where the tubes are fixed, preventing the fluids from mixing. Tube pitches are generally designed in a triangular or square arrangement, typically 1.25 times the tube diameter.

Design Types: U-Tube and Straight-Tube Exchangers

Fintherm offers two basic designs based on the physical and thermodynamic requirements of the process:

• U-Tube Heat Exchanger: In this model, where the tubes are bent into a “U” shape, the structure naturally compensates for expansions caused by high temperature differences. It is preferred in areas requiring high capacity and systems where the pressure resistance of a circular cross-section is utilized.
• Straight-Tube Heat Exchanger: A model where the tubes are fixed on a straight line with tube sheet connections. Its biggest advantage is that the inside of the tubes can be easily cleaned mechanically. It offers high performance up to 350°C in food and chemical sectors where hygiene is critical.

Material Selection and Manufacturing Technology

During the **shell and tube heat exchanger manufacturing** process, material selection is determined by our expert team according to the corrosive effect and temperature of the fluid. For tube materials; copper, stainless steel, carbon steel (drawn or welded), cupro-nickel, brass, or titanium can be used. On the shell side, a wide range is available from carbon steel to duplex steels. The **baffling** design is of critical importance in manufacturing. Baffles force the shell-side fluid to zigzag around the tube bundle, maximizing turbulence and therefore the heat transfer coefficient.

Usage Areas and Sectoral Applications

Thanks to their flexible design and durability, these exchangers find a place in almost every industry:

• Oil and Refinery: Crude oil heating, gas liquefaction, and heavy oil cooling.
• Power Generation: As condensers and steam generators in thermal and nuclear power plants.
• Textiles and Dyeing: Precise temperature control in yarn and fabric dyeing machines.
• Maritime: Cooling of ship engines using seawater.
• HVAC and Food: Central heating systems, pasteurization, and chiller cooling groups.