Issues related to U-tube heat exchangers

It is possible; it is generally used in boilers, such as positive-pressure air supply U-tube vertical hot air stoves. These stoves mainly consist of an air inlet, a hot air outlet, a furnace door, a furnace chamber, a furnace lining, an outer shell, an inner wall, and a top cover. Multiple U-shaped ducts are installed both longitudinally and transversely within the furnace chamber. The flow direction of the air is from top to bottom, then from bottom to top, and again from top to bottom. The furnace design makes effective use of the characteristics of U-shaped conduits, optimizing the structure of the positive-pressure hot air furnace; it reduces the number of welds, effectively overcoming the problems of cracking and leakage caused by pipe expansion in such furnaces. It also simplifies the production process, lowers manufacturing costs, and better addresses the issue of tea having an smoky taste.

U-tube heat exchangers are generally horizontal, with vertical types being less common; this is mainly due to considerations related to fluid accumulation. If there is no fluid accumulation in the medium, it should be fine to use a U-tube heat exchanger

I found out in more detail that gas flows through the tube side, while liquid flows through the shell side; under such conditions, a vertical design can definitely be used. . . . Thank you!

It can be designed in a vertical format; the heat transfer coefficient of a vertical design is higher than that of a horizontal one, as it is less likely for a liquid film to form on the tube walls in a vertical setup, which enhances the heat transfer efficiency

I’ve seen that vertical designs are generally used; whether it’s liquid or gas flowing through the tube side or shell side, the heat exchange efficiency is good, and there’s no issue with fluid accumulation (any accumulation in the shell side can be removed regularly through the bottom drain outlet)； Accumulation of fluid in the tubes, which is discharged through the drainage ports on the tube sheet), and the issue of a low heat transfer coefficient (since the liquid and gas are in constant flow, how can a liquid film be formed?). The vertical type offers the best stress distribution on the tube bundle, and it is also the most convenient for installation and removal. Because it has only a single tube sheet, with the other end being empty and lacking any structural support, this is not favorable for the welds at the tube ends, and it should be avoided as much as possible.

In petrochemical plants, there are no vertical U-tube heat exchangers; all of them are horizontal. U-tube heat exchangers are mainly used in bottom reboilers, and due to the characteristics of their operation, horizontal designs are employed. The fluid flowing inside the tubes is steam, while the process fluid flows outside the tubes. Vertical heat exchangers mainly use fixed-tube-sheet type heat exchangers. :lol :lol

I also think a vertical design is feasible; in the projects we work on, there are many U-shaped heat exchangers that are vertical, and they all perform very well. :)

Horizontal U-tube heat exchangers don’t seem to be very common! U-tube heat exchangers are generally used for gas condensation! If the client wants a vertical U-tube heat exchanger, it’s not a big problem to have the gas and the liquid flow on the shell side! It’s just that if a liquid is used, a low flow rate may have a significant impact on heat transfer due to F and A! (Problems present in all vertical types)

The U-tube heat exchangers we produce are horizontal in design; the circulating water flows through the shell side, while the refrigerant flows through the tube side. I haven’t seen many vertical ones