Optimized Design Of Spirally Wound Tube Heat Exchanger

Spirally wound tube heat exchanger is a new type of heat exchanger. Compared with the traditional heat exchangers, it has great advantages in economic and energy saving. Its compact structure is good for heat transfer. It has strong ability of temperature self-liquidating. In addition, it’s not easy to scale. Although the relevant design vision were proposed early in the last century, it was difficult to do the accurate design and calculation. At present, the progress in the design and manufacture of spirally wound tube heat exchanger is relatively slow. The design principles and procedure of the spirally wound tube heat exchanger have been rarely mentioned in documents. Same as the design of other heat exchanger, the two-phase flow problem of the shell side and tube side in the spirally wound tube heat exchanger is one of the most complex problems. To calculate and design the spirally wound tube heat exchanger, on one hand the methods that are applied to design the conventional heat exchanger are used; on the other hand the specialized production experiences are referred.In the thesis, a computer program was written in C #, which could simplified the calculations of the spirally wound tube heat exchanger design. Firstly, a summary about the characteristic, structure, applications, usage and management of the spirally wound tube heat exchanger was made. Besides, the prospect of the spirally wound tube heat exchanger was analyzed. With the help of previous experience in designing and manufacturing spirally wound tube heat exchanger, an optimized design method called segmented method was adopted to do the theoretical analysis for the thermal design of spirally wound tube heat exchanger. Combined with the geometry of spirally wound tube heat exchanger, the tube-side and shell-side mathematical models of heat transfer film coefficient were created. In the thermodynamic calculation of the heat exchanger, the calculations mainly focus on the calculations of overall heat transfer coefficient, the total heat transfer area and the pressure loss. Before programming in C#, a flow chart of the running program was drawn. The relevant physical parameters and formulas were imported and written in the program, finally the program was debugged. After debugging theprogram, the given process conditions were used in the program to calculate. To check the accuracy of the program, the running results of the program were compared to the manual calculation results. The error of two results was very small,so the program was proved to be written correctly. Meanwhile, the optimized selection of manufacturing materials of the heat exchanger was also taken into consideration after using the program to simplify the calculation. The performance of a series of materials with different characteristics was evaluated, which optimized the design of the spiral wound tube heat exchanger.