Research And Application On Composite Strengthening Heat Transfer Performance And Flow Resistance Of Inner Finned Twisted Tube Heat Exchanger

With energy tending to scarcity, the efficient utilization of energy has become an inevitable trend. As the core cooling system equipment, heat exchanger accounts for more than35%of the entire system equipment costs. So that it is great significance to strengthen heat transfer effect of heat exchanger. Compared with smooth tube, twisted tube heat exchanger can significantly improve the heat transfer effect, reduce shell pressure drop and reduce costs.Experiment research is made in paper about the heat transfer and flow resistance performance of twisted tube heat exchanger by the water-air mode and water-water mode. The shell and tube side coefficient criteria relationships of heat transfer and flow resistance are fitted which can be the experimental basis for heat exchanger design and engineering applications. The design program of inner fin twisted tube heat exchanger is written by MATLAB programming language.The technologies of internal fin tube and twisted tube are common heat transfer enhancement techniques. And the combination of the above two techniques is the new heat transfer enhancement technology. The experimental study found that the tube and shell heat transfer properties of internal finned twisted tube could increase24.6%and50%to the smooth tube. And the shell-side pressure drop can greatly reduce for no-baffle in the shell. At the premise to meet heat exchange effect, the heat exchange amount unit pressure drop is the most at Re=1800and the efficiency of energy utilization is highest.The paper introduces engineering application of twisted tube heat exchanger used overhead condenser of the steam jet pump system. Relative to the baffle plate heat exchanger, the heat transfer effect increase by10.2%, the weight by18.5%. pressure drop reduce by16.4%.