Characteristics of finned-tube heat exchangers
Release time:
2021-04-26 15:34
Source:
Finned tube heat exchangers are widely used heat exchangers, with broad applications in both households and production. So what are the characteristics of finned tube heat exchangers?
(1) Finned tube heat exchangers have good heat transfer performance. The boiling heat transfer coefficient of the T-tube in the R113 refrigerant is 1.6-3.3 times higher than that of the bare tube.
(2) In traditional bare tube heat exchangers, the cold medium will only start bubbling and boiling when the temperature of the hot medium is 12℃-15℃ higher than the boiling point or bubble point of the cold medium. However, the T-type finned tube heat exchanger only requires a temperature difference of 2℃-4℃ for the cold medium to undergo fine, continuous, and rapid bubbling boiling, forming an advantage over bare tubes.
(3) High heat transfer efficiency: Due to the disturbance of the fluid by the fins, the boundary layer is constantly broken, resulting in a larger heat transfer coefficient; at the same time, due to the thinness of the baffles and fins, they have high thermal conductivity, so the finned tube heat exchanger can achieve very high efficiency.
(4) Cheaper and lighter than aluminum porous surface heat transfer tubes: This is because they are compact and mostly made of aluminum alloy. Now, steel, copper, and composite materials are also mass-produced.
(5) Due to the strong gas-liquid disturbance in the tunnel, the gas is ejected at high speed along the T-shaped groove, and scaling is not easy to occur inside and outside the T-shaped groove, ensuring that the equipment can be used for a long time, and the heat transfer effect will not be affected by scaling.
(6) Finned tube heat exchangers have strict manufacturing process requirements and complex process: They are easily blocked, not corrosion-resistant, and cleaning and maintenance are difficult. Therefore, they can only be used in occasions where the heat transfer medium is clean, non-corrosive, not easy to scale, not easy to deposit, and not easy to block.
(7) Finned tube heat exchangers are highly adaptable. Finned tube heat exchangers can be used for: gas-gas, gas-liquid, liquid-liquid, heat exchange between various fluids, and phase change heat exchange involving state changes. Through the arrangement and combination of flow channels, they can adapt to different heat exchange conditions such as countercurrent flow, cross-flow, multi-stream flow, and multi-pass flow. Through the series, parallel, and series-parallel combinations of units, the heat exchange needs of large-scale equipment can be met. In industry, they can be standardized and mass-produced to reduce costs, and modular combinations can be used to increase interchangeability.
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