There can be many variations on the shell and tube heat exchanger design. Typically, the ends of each tube are connected to plenums (sometimes called water boxes) through holes in tubesheets. The tubes may be straight or bent in the shape of a U, called U-tubes.
1, the fixed tube plate
When the temperature difference between the two fluids is large, a compensating ring (or expansion joint) is welded in the proper position of the outer shell of the fixed tube plate heat exchanger with both ends of the tube sheet and the shell being integrated. When the shell and tube bundle thermal expansion is not the same time, the compensation ring slow elastic deformation to compensate for thermal stress caused by thermal expansion.
Features: simple structure, low cost, shell-side cleaning and maintenance difficulties, the shell process must be clean and not easy to scale the material.
U-tube heat exchanger tubes are bent into a U-shaped tube, fluid inlet and outlet were installed in the same side on both sides of the head with a partition into two rooms, each tube is free to expand and retract, to solve the heat Compensation problem.
Features: simple structure, light weight, suitable for high temperature and high pressure applications. Pipe cleaning difficult, tube fluid must be clean and not easy to scale material.
3, floating head type
Shell and tube heat exchanger at both ends of the tube plate, one end is not connected with the shell, the end of said floating head. Tube heating, the tube with the floating head can be free along the axial stretching, completely eliminating the temperature stress.
Features: complex structure, high cost, easy cleaning and maintenance, complete elimination of temperature stress, the application of universal.
The simple design of a shell and tube heat exchanger makes it an ideal cooling solution for a wide variety of applications. One of the most common applications is the cooling of hydraulic fluid and oil in engines, transmissions and hydraulic power packs. With the right choice of materials they can also be used to cool or heat other mediums, such as swimming pool water or charge air. One of the big advantages of using a shell and tube heat exchanger is that they are often easy to service, particularly with models where a floating tube bundle (where the tube plates are not welded to the outer shell) is available.
Source: China shell and tube heat exchanger Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)