【Daily Question No. 291】December 8, 2020

Error. The thermal compensation methods for heat exchangers include: ① In a floating-head heat exchanger, the tube sheets at both ends are not connected to the shell; the end that is not connected is called the floating head. When the tubes are heated, the tube bundle together with the floating head can expand and contract freely along the axial direction, completely eliminating thermal stress. 　②In a fixed-tube-sheet fixed-tube heat exchanger, the tube sheets at both ends and the shell are integrated together. When there is a large temperature difference between the two fluids, a compensation ring or expansion joint is welded in an appropriate position on the shell. When the shell and the tube bundle expand thermally at different rates, the expansion ring undergoes slow elastic deformation to compensate for the thermal expansion caused by temperature differences. 　③In a U-tube type heat exchanger, each tube is bent into a U shape; the fluid inlets and outlets are located on opposite sides of the same end. The shell is divided into two chambers using partitions, and each tube can expand and contract freely to address thermal compensation issues.