Heat Transfer Performance of a Plate Air Preheater with Dimpled and Multi-Objective Optimization

Abstract:

Taking the fully welded dimples plate air preheater as the object， the Workbench Fluent software is used to numerically simulate the influence of the characteristic structure parameters of the dimpled plate on the heat transfer and flow resistance performance by orthogonal experiment. Based on the parameter sensitivity analysis， the effect of single factor on the heat transfer flow resistance performance is obtained： longitudinal spacing of dimpled > long axis > horizontal spacing > depth. Moreover， the fact is obtained that under the synergistic effect of multiple factors， the structural parameters horizontal and longitudinal distance have a greater impact on performance than the depth-diameter ratio of the dimpled based on the analysis of the response surface method. Furthermore， three sets of better structural combinations within a given range are obtained based on the genetic algorithm， with the smallest friction factor， and the largest Nusselt number and comprehensive heat transfer factor as the optimization objectives.