Crimped Fin Tube: Helical Tension Wound Spiral Fin Tubes for Heat Exchanger

Helical Tension Wound Spiral Fin Tubes for Heat Exchanger

Helical tension-wound spiral fin tubes are highly efficient heat exchange components. They are formed by continuously wrapping a metal strip in a spiral pattern and affixing it to the surface of a base tube, creating a seamless fin structure. This process not only overcomes the performance limitations of traditional fin tubes but also demonstrates irreplaceable technological advantages in the energy, chemical, and HVAC industries.

High heat transfer performance is the core characteristic of helical tension-wound spiral fin tubes, stemming from maximizing heat transfer area and minimizing contact thermal resistance. Compared to discontinuous fins, the continuous spiral structure increases the contact length between the fin and the base tube by over 30%. Combined with high-frequency welding or expansion joints, this reduces the contact thermal resistance to below 0.0005 m²・K/W, significantly lower than the 0.002 m²・K/W of a series-finned tube.

For example, wrapping a 25mm Φ base tube with aluminum fins (0.3mm thick and 12mm high) creates a heat transfer area of ​​1.2-1.5 cm per meter, 8-10 times that of a plain tube. At the same flow rate, the heat transfer coefficient (K value) is 2-3 times higher than that of a plain tube, making it suitable for applications with limited space but high heat transfer requirements.

Basic Structure of a Helical Tension Wound Spiral Fin Tube

A helical tension wound spiral fin tube consists of an inner tube and outer spiral fins. The fins are typically wound around the inner tube at a specific angle. This structure not only increases the heat transfer area but also enhances the turbulence of the fluid within the tube, thereby improving heat exchange efficiency. As the fluid flows through the inner tube, heat is exchanged between the fins and the inner tube, creating a highly efficient heat exchange process.