The finned tube heat exchanger is also called a tube fin heat exchanger. The structural feature is that a plurality of fins are arranged on the outer surface or the inner surface of the heat exchanger tube, and the commonly used fins have two types of longitudinal and lateral directions.
The connection between the fin and the surface of the tube should be close, otherwise the contact thermal resistance at the joint is large, which affects the heat transfer effect. Commonly used connection methods include hot sleeve, inlay, tension winding and welding. In addition, the finned tube can also be manufactured by integral rolling, integral casting or machining.
Gas heating and cooling problems are often encountered in chemical production. Since the convective heat transfer coefficient of the gas is small, when the other fluid that exchanges heat with the gas is water vapor condensation or cooling water, the gas side thermal resistance becomes a heat transfer control factor. In order to enhance heat transfer at this time, it is necessary to increase the convective heat transfer area on the gas side. The fins are arranged on the gas side of the heat exchange tube, which increases the heat transfer area on the gas side, enhances the degree of gas turbulence, and reduces the heat resistance on the gas side, thereby increasing the gas heat transfer coefficient.
Of course, the addition of fins will increase the equipment cost, but generally, when the ratio of the convective heat transfer coefficient of the two fluids exceeds 3:1, it is economically reasonable to use a finned tube heat exchanger. Finned tube heat exchangers are widely used in the industry as air coolers. The use of air instead of water cooling can be used not only in water-deficient areas, but also in areas where water is abundant, and air cooling has also achieved greater economic benefits.
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