Simulation and Thermal Analysis of a New Efficient Compact Heat Exchanger
In onder to improve the design function of the new efficient compact heat exchanger and meet its thermodynamic performance requirements,the structural parameters of the wound tube and the bridg-ing arrangement method were designed.By employing a novel variable diameter and variable line bridging method,the dense arrangement of tube bundle was realized in the case of limited volume;the modeling of full-scale fluid field and the CFD simulation were carried out for the design of the new heat exchanger;and the reliability was verified by comparing the three-dimensional modeling result and one-dimensional procedure calculation result.The calculation results show that the thermodynamic performance of the three-dimensional calculation has only a small deviation from the one-dimensional calculation,with a rel-ative error of only 3.74％for the total heat transfer coefficient and only 1.04％for the total transferring heat.This verifies the good accuracy of the three-dimensional calculation model;at the same time,com-bined with the temperature cloud chart,it is proved that the heat exchange area is basically concentrated in the winding section,which provides a way to simplify the calculation of complex heat exchangers;the new efficient compact heat exchanger design realizes that the double stream flow at the tube side can oper-ate independently,and there is no invalid heat exchange zone between the same layer.The overall heat transfer is smooth,with small flow resistance on the shell side and great heat transfer capacity main-tained;the heat exchange volume power of the entire machine has reached 4.67 MW within the working conditions.
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