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Lord Fin Tube-Selection of finned tube specifications

Finned tube heat exchangers and the factors to consider when selecting finned tube specifications. It covers various aspects, including the role of fins in enhancing heat transfer, considerations for fin material and processing technology, and the impact of flow state on heat transfer coefficients.

1. Function of Fins:

   - Fins in finned tube heat exchangers enhance heat transfer.

2. Selection of Finned Tube Specifications:

   - Consideration of enhanced heat transfer is crucial when selecting finned tube specifications.

   - Various methods, such as changing fin material, improving processing technology, increasing fining ratio, improving flow state, and increasing turbulence, can be employed.

   - Manufacturing limitations exist for the height and thickness of fins.

3. Fluid Flow and Heat Transfer:

   - Fluid flow is categorized into laminar flow and turbulent flow.

   - Transitioning laminar flow to turbulent flow is an economical strengthening measure.

   - Use of small-diameter heat exchange tubes, like copper tubes, is a cost-effective approach.

4. Fining Ratio and Heat Transfer Coefficients:

   - In turbulent flow, adopting a reasonable fining ratio is important.

   - Increasing fin density and height on the weaker side can enhance heat transfer.

5. Considerations for Air Heat Exchange:

   - Higher fining ratio is beneficial for air heat exchange without phase change.

   - For air with phase change (condensation), removing condensate is crucial.

   - Larger sheet distance helps reduce tension on the water side.

6. Material Adaptation to Temperature:

   - Selection of finned tube specifications should consider material adaptation to temperature.

   - High-temperature applications may require high-frequency welding fins.

7. Other Considerations:

   - Anti-corrosion, service life, thermal resistance, and heat exchange efficiency are important factors in finned tube heat exchanger selection.

Additionally, the distinction between laminar and turbulent flow, the use of small-diameter heat exchange tubes for improved turbulence, and the significance of the fining ratio in turbulent flow conditions are discussed. The text also touches upon the specifications of commonly used steel-aluminum composite finned tubes and considerations for cases where the air outside the tube undergoes a phase change.

Furthermore, the information emphasizes the importance of addressing condensation when the air outside the tube is condensed, highlighting the need for an appropriate sheet distance to prevent drag on heat transfer. The selection of finned tube specifications is stressed as crucial, taking into account material adaptation to temperature, anti-corrosion properties, service life, thermal resistance, and overall heat exchange effectiveness.

Finned tube heat exchanger

Finned tube heat exchangers

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