4. When the medium is heated, the tube wall temperature of the fin tube under the same thermal load is lower than that of the bare tube, which is beneficial to reduce the high temperature corrosion and overtemperature damage of the metal surface. Regardless of whether the medium is heated or cooled, the heat transfer temperature difference is smaller than that of the smooth tube, which is beneficial to reducing the scale on the outer surface of the tube. Another important reason for the reduction of fouling is that the finned tube will not form a uniform overall fouling layer along the circumference or axial direction like a smooth tube. The flakes formed along the surface of the fin and the tube will expand and contract under the action of expansion and contraction. It breaks at the root of the fin, prompting the dirt to fall off by itself. 5. For phase change heat, the heat transfer coefficient or critical heat flux can be adjusted. The main disadvantages of finned tubes are their high cost and large flow resistance. The finned tube, such as an air cooler, has a complicated process and large resistance, resulting in high power consumption. However, if the shape is proper, the power consumption can be reduced, which is more cost-effective than the benefits of enhanced heat transfer.
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