Performance Design of Heat Exchanger Based on Field Synergy Theory

Abstract

This paper mainly discusses the numerical simulations of thermal-hydraulic performance for different geometries chevron-type plate heat exchangers with filed synergy theory and optimization design The dimensionless geometric parameters Pc/b and beta are used as design parameters The counter flow is simulated under the boundary conditions of a fixed Reynolds number and a constant temperature at the inlet of the cold and hot fluid In order to make the boundary conditions satisfy physic property the adiabatic section is added The grid independent test was used to confirm the solution stability and the energy conservation formula to determine the correctness The results is evaluated by fiction factor Nusselt number and filed synergy theory and obtained the relationship of geometric parameters to heat transfer and pressure drop The optimization design is conducted by using the neural network(NN) and the genetic algorithm(GA) we obtained the following results (1) Considering the performance evaluation criteria(PEC) as an objective function the results found are verified by numerical simulations and better than the training set showing the accuracy of the optimization method and the potential for finding novel answers (2) Using NSGA-II to establish a Pareto front with Nusselt number and friction factor We provide design suggestions and design parameter tables of the Pareto front for reference

Date of Award	2020
Original language	English
Supervisor	Chieh-Li Chen (Supervisor)