Advantages of open-tooth high-frequency welded finned tubes

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Open-fin tubes, also known as toothed-fin tubes, are primarily used in heat exchangers. Their structure features multiple triangular openings evenly distributed along the outer circumference of the fins; the fins are arranged in a continuous rectangular pattern, which allows the gas flowing between the fins to mix with each other. The advantage of this design is that, under the same heating medium conditions, open fins increase the likelihood of contact between high-temperature flue gas and the fins, thereby enhancing the heat transfer efficiency. The average heat transfer coefficient increases by 5–13 percentage points. Additionally, due to the openings in the fins, the flow area for the flue gas is increased, which reduces the pressure difference across the fins. The resistance of open-fin tubes is reduced by about 20%, which helps to improve heat transfer efficiency and prevent dust accumulation.