Numerical Simulation On Heat Transfer Of A Plate Heat Exchanger And Parameter Optimization Of Corrugated Plate

Compared with conventional shell-and-tube heat exchanger, plate heat exchanger showsextremely strong characteristics of heat transfer. It is designed more compactly with a largeheat exchange area in a Unit volume so as to achieve the purpose of energy conservation.With double-channel model as the object of study, this paper analyzes the plate heatexchanger’s heat transfer mechanism and numerically calculates the single-phase flow andtwo-phase flow conditions in the channel. Based on the single-channel model numericalcalculation, the corrugated plate is optimized by using multi-objective genetic algorithms.Based on the analysis of a plate heat exchanger heat transfer mechanism, establish hotand cold double-channel model and simplify the process of heat transfer in plate heatexchanger as the process of coupled heat transfer of fluid in the hot and cold channel throughcorrugated plate. On the basis of the analysis for the single-phase fluid convection andcondensation heat transfer mechanism, explore the single-phase fluid and the two-phase flowin hot and cold corrugated plate channels for coupled heat transfer problems.Taking the double-channel model as the study object of this paper and using FLUENTsoftware to simulate the characteristics of water-water’s fluid flow and heat transfer in the thehot and cold channel. And then, analyze the velocity field, temperature field and the pressurefield of the fluid in the the hot and cold channel. Considering the impact of the fluid coupledheat transfer in the hot and cold channel through the middle of corrugated plate during thenumerical simulation. From the simulation results, the temperature and the surface heattransfer coefficient distribution of the intermediate corrugated plate is obtained. And then,study the effect of the fluid inlet velocity in hot and cold channel on the pressure drop andheat transfer performance.In addition, Take double-channel model as the object of study, introduce the two-phaseflow mixture model into calculation which is to simulate the condition of the water vapourand cooling water in the channel respectively. Analyze the fluid of velocity field, temperaturefield and the pressure field in hot and cold channel. Use UDF (custom function) to achievethermal mass and energy conversion for saturated water vapor condensation phase change inchannel. The paper has got a liquid phase volume fraction distribution characteristics in hotchannel and study the impact of the saturated water vapor condensation phase change in the hot channel for fluid flow velocity closed to the corrugated plate.Based on numerical simulation of single-phase flow in a single channel, use amulti-objective genetic algorithm to optimize the design of the corrugated plate withminimum entropy generation number and minimum pressure drop for the objective function.Apply the DOE test design method to the design of multi-parameter space samples for threegeometric design parameters of the corrugated plate, which are wave height and normal pitch.Apply response surface methodology (RSM) to build the design space with samples asresponse points and then apply multi-objective genetic algorithm to search a set of Paretooptimal solutions and to meet the objective function in the entire design space.This paper apply the method of numerical simulation to simulate fluid flow and heattransfer characteristics of plate heat exchanger in double channel model,in order to provide areference for the overall performance of the plate heat exchanger in the future. It has animportant significance for improving performance of the heat exchanger that optimizing thecorrugated plate structure.