ASTM A192 Carbon Steel HH-Type Square Finned Tube for Economizers in Boilers

Key Specifications

• Max. Working Temperature: 300°C
• Atmospheric Corrosion Resistance: OK
• Mechanical Resistance: Good
• Fin Material Options: Copper, Aluminum, Carbon Steel, Stainless Steel
• Base Tube Material Options: Various materials available, such as Carbon Steel Tube, A179, A192, A210, Stainless Tube A269/A213 T5 T11 T22 304 316

Advantages

The primary advantage of using finned tubes lies in enhancing heat transfer from a hot fluid to a colder fluid through a tube wall. This is achieved by increasing the outside surface area compared to the inside surface area. Finned tubes offer improved heat transfer rates, especially when the heat transfer coefficient of the fluid inside the tube significantly exceeds that of the fluid outside the tube.

By employing finned tubes, the overall heat transfer rate is increased, reducing the total number of tubes required for a given application. This, in turn, leads to a decrease in equipment size and can lower project costs in the long run. In many cases, a single finned tube can replace multiple bare tubes at a fraction of the cost and volume.

Finned tubes are particularly beneficial in applications where heat transfer occurs between a hot fluid and a colder fluid through a tube wall, such as in air heat exchangers. The increased surface area provided by fins helps compensate for lower heat transfer coefficients on the outer side of the tubes. The flow pattern of a finned tube exchanger is commonly crossflow, but can also be parallel flow or counterflow.

Overall, fins are essential for augmenting the effective surface area of heat exchanger tubing, especially when the heat transfer coefficient on the outer surface of the tubes is substantially lower than on the inner side. Finned tubes are commonly used for transferring heat from liquid to gas, vapor to gas (e.g., steam to air heat exchangers), and thermic fluid to air heat exchangers.

The efficiency of heat transfer depends on the temperature difference between the fluids, the heat transfer coefficients, and the exposed surface areas of the fluids involved.