Types of baffle plates for heat exchangers
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As far as I know, regardless of the type of heat exchanger used, its baffle plates can be designed as arc-shaped plates, with a single arc-shaped baffle being the most commonly used design. However, in some heat exchangers with fixed tube sheets that I have designed recently, the baffle structure consists of double arc-shaped baffles, and I encountered a challenge during the design process: how to determine the shape of the edges missing in such double arc-shaped baffles? Single arch baffle plates are specified in GB151, but the edgeless structure of double arch baffle plates is not described. Please help, experts. Very urgent!!:handshake
This issue has been discussed before; take a look at the following post, which should be helpful to you: http://bbs.hcbbs.com/viewthread.php?tid=297645&highlight=%D5%DB%C1%F7%B0%E5
A double-arch baffle heat exchanger is a shell-and-tube heat exchanger that uses double-arch baffles in place of single-arch baffles. The double-arch baffle consists of two types: Type A (double-arch baffle) and Type B (central baffle), which are arranged alternately along the length of the tube bundle. The double-arch baffle divides the fluid into two parallel streams; the length over which the flow occurs laterally (i.e., the number of tubes that the lateral flow passes through) is roughly half that of a single-arch baffle with the same indentation. Since the pressure drop is proportional to the square of the velocity and to the length over which the flow takes place, or to the number of tube rows that the lateral flow passes through, the pressure drop associated with double-arch baffles, using the same baffle spacing and the same indentation, is significantly lower than that of single-arch baffles. Although the heat transfer coefficient also decreases, since it is proportional to the speed raised to the power of 0.6, the decrease in the heat transfer coefficient is much less than that in pressure. Compared with single-arch baffles with the same baffle spacing and notch, the pressure drop of double-arch baffles is 30%–50% of the corresponding value for similar devices, while the heat transfer coefficient is 60%–80% of the corresponding value for similar devices.