Fliud Flow And Heat Transfer Analysis Of An Oblique Grid Plate Heat Exchanger And Development Of A New Plate Structure

As important heat transfer equipment,more and more plate heat exchangers are used in industries.One of the main structural factors determining the performance of the plate heat exchanger is the profile of the plate.In this thesis,finite element method was used to simulate the fluid flow and heat transfer in an oblique grid plate heat exchanger and based on the analysis,a new profile plate was developed.The main contents are as follows:(1)An oblique grid plate heat exchanger was taken as the research object,and a finite element model composed of cold and hot dual channels between the plates was established and get the corresponding calculation results Compared with the experimental results,the error of the numerical computation is within a rational range,implying that the finite element simulation is believable.(2)Influences of the structural parameters with their interactions on the heat transfer and flow properties of the heat exchanger were investigated.Orthogonal experiment analysis was performed to find the optimal structural parameter combination under different conditions for a better fluid flow and heat transfer in the heat exchanger.(3)Targeted by the heat transfer and prossure drop,a new type of diamond plate heat exchanger was developed based on the inclined grid plate heat exchanger,.Taking the heat transfer coefficient,pressure drop,comprehensive performance index and heat transfer index as reference objects,the diamond plate heat exchanger was compared with the original inclined grid plate heat exchanger.Results show that the heat transfer coefficient of the new plate structure is higher under certain combinations of structural parameters,but the pressure drop also increases significantly.Both heat exchangers can be applied to different operating conditions.