ASME SA210 GR.A1 Serrated Fin Tube For Power Plant HRSG (Heat Recovery Steam Generator) System

Serrated fin tubes are specialized heat transfer components widely used in HRSG (Heat Recovery Steam Generators) to enhance thermal efficiency, particularly in convection section-Economizer, where gas-side heat transfer is the controlling factor. The serrations—small, segmented notches cut into the fin edge—disrupt the boundary layer of the flue gas, creating turbulence that increases the convective heat transfer coefficient by roughly 10%–25% compared to solid fins.

Serrated Fin Tube + HRSG Application :

A. Economizers: High performance serrated fin tubes are frequently used to maximize energy recovery from the flue gas.
B. Convection Section: Ideal for areas requiring high thermal performance due to higher gas velocities. In Fired Heater or Fired Furnace , Convection are tube coil are top important .
C. Clean Gas Applications: Serrated fins are generally recommended for clean applications, such as natural gas firing, where ash accumulation is minimal.

Serrated Fin Tube + HRSG advantage :

1. Superior Heat Transfer: Serrations increase turbulence and break up the fluid boundary layer, significantly improving heat transfer efficiency.
2. 2. Higher Surface Area: They provide a larger effective heating surface compared to solid fins, allowing for more compact tube bundle designs.
3. Reduced Overall Cost: The higher efficiency can result in a lower total annual cost for the HRSG, even if the fins themselves are slightly more expensive.
4. High-Frequency (HF) Welded Integrity: These fins are typically attached to the base tube using HF resistance welding, providing a 95% weld rate for excellent thermal contact and structural durability.