T type finned tube is also called T type screw pipe, material can be carbon steel, stainless steel, and copper.
T type finned tube is a kind of high efficient heat exchange tube which is formed by the light tube through the rolling process. The structure is characterized in that the outer surface of the pipe is formed by a series of spiral T type tunnel. Tube medium when heated in the tunnel formed a series of bubble nuclei, because in the tunnel cavity in around heated state, bubble nuclei enlarge rapidly fill the inner cavity, continuing heated so that the pressure inside the bubble is rapidly increasing, prompting the bubble surface slit rapidly ejected from the tube. Bubble jet with a larger erosion force, and produce a certain local negative pressure, so that the surrounding lower temperature liquid into the T type tunnel, the formation of continuous boiling. In the unit time, the heat carried away by the unit surface area is much larger than that of the light tube, so the tube type has a higher boiling heat transfer capability.
Advantages of T shaped finned tube:
1, good heat transfer effect. The boiling heat transfer coefficient of T tube is 1.6-3.3 times higher than that of light tube in R113 working medium.
2, the conventional light tube heat exchanger, only when the temperature of the heat medium is higher than that of the cold medium boiling point or bubble point 12 DEG C - 15 DEG C, cooling medium will bubble. And T type finned tube heat exchanger only the difference in temperature between 2 and 4 DEG C, cooling medium can be boiling, and the bubbling dense, continuous, fast, with the formation of the unique advantages compared to the light pipe.
3, with Freon 11 medium tube test show that, T type tube boiling heat coefficient is up to light tube 10 times; with liquid ammonia for medium small bundle experimental results, the total heat transfer coefficient is 2.2 times the light tube; C3 and C4 hydrocarbon separation column and reboiler industrial calibration shows that, low load, t type pipe overall heat transfer coefficient than that of a smooth tube high 50%, high load, high 99%.
4, compared with the aluminum porous surface heat transfer tube price is cheap.
5, due to the tunnel inside the gas and liquid disturbance is very intense and gas along the T seam high-speed jet, so whether it is the T slot or outside the tube surface, are not easy to scale, which ensures that the device can be used for a long time and heat transfer effect will not be affected
T type finned tube applications:
As long as the shell side medium is relatively clean, no solid particles, no colloid, can be used as T type finned tube for heat exchanger components, the formation of T type finned tube heat exchanger, in order to improve the effect of shell side boiling heat transfer.