Optimization Design of the Shell-and-Tube Heat Exchanger The 26th National Conference on Mechanical Engineering The Chinese Society of Mechanical Engineering Optimization Design of the Shell-and-Tube Heat Exchanger Adviser：David Lin Speaker：Joseph Liu School: NUTN,GIMSE Date : 2009/11/21

OUTLINE Introduction 1. Problem Definition 2. Flow Chart 3. Structure Optimization Design of the Shell-and-Tube Heat Exchanger OUTLINE Introduction 1. Problem Definition 2. Flow Chart 3. Structure Heat Exchanger optimization approach 1. Model and Analysis 2. Optimization approach Results and Discussions Conclusion

Sketch of Heat Exchanger Optimization Design of the Shell-and-Tube Heat Exchanger Sketch of Heat Exchanger High Temp. working Fluid Low Temp. working Fluid Temp. Decrease Temp. Increase : Heat Exchange Medium : Heat Exchanger

Problem Definition : Heat Exchanger Optimization Design of the Shell-and-Tube Heat Exchanger Problem Definition : Heat Exchanger Types

2D Boundary Conditions The stars remark the Logarithmic walls Optimization Design of the Shell-and-Tube Heat Exchanger 2D Boundary Conditions The stars remark the Logarithmic walls

Thermal conductivity: Optimization Design of the Shell-and-Tube Heat Exchanger Equations Reynolds number: Thermal conductivity: Heat flux: The quantity: The dimensionless wall offset:

Optimization Design of the Shell-and-Tube Heat Exchanger Math Model of SCGM

Heat Exchanger optimizer Optimization Design of the Shell-and-Tube Heat Exchanger Heat Exchanger optimizer Structure COMSOL Script Optimization unit User-developed code (SCGM) Direct problem unit Commercial code (COMSOL) Grid generation unit Commercial pre-processor Fortran

Purpose of SCGM : 將目標函數最大化 Optimization Design of the Shell-and-Tube Heat Exchanger Purpose of SCGM : 將目標函數最大化 設定變數的初始條件 : 找目標函數G 代入求解器 : COMSOL 找出梯度方向 : P 敏感度分析 微擾法 計算共軛梯度係數 : γ 自訂步進距β 搜尋新方向 下次疊代增加量 :

Optimization Design of the Shell-and-Tube Heat Exchanger Flow Chart

Optimization Design of the Shell-and-Tube Heat Exchanger Results & discussions

Results & discussions Outlet temperature distribution Initial Design Optimization Design of the Shell-and-Tube Heat Exchanger Results & discussions Outlet temperature distribution Initial Design Optimal Design

Optimization Design of the Shell-and-Tube Heat Exchanger Results & discussions

Optimization Design of the Shell-and-Tube Heat Exchanger Results & discussions

Conclusions Optimization Design of the Shell-and-Tube Heat Exchanger Uniformly Temperature Distribution Heat Exchange Efficiency Heat Removal Quantity

Follow up Experiment verify Optimization Design of the Shell-and-Tube Heat Exchanger Follow up Experiment verify

Strength Weakness Opportunity Threat Optimization Design of the Shell-and-Tube Heat Exchanger SWOT of Optimal Design for Heat Exchanger Strength Weakness Opportunity Threat • Efficient, clean and integrated • More detail information • Can be applied to many models • Solution can be checked • Can reflect uncertainty in current knowledge • Package tools freely available (E.g. Pro/E, Solid works, AutoCAD, COMSOL) • Complicated notation, Design Parameter confusing • No absolute identify • Need to incorporate constraints • Assumptions is not exactly real • Limited industry expertise & leadership • Push current environment for quantitative methods • Lots of work out there: – Not just clinical development and manufacturing (big ticket) – Pre-process and experimental control • Applied problem solving • Money / funding available • Resistance (doubt and skepticism) – Lack of understanding / awareness & training / resource • Industry short sightedness

Thank You PUT ENERGY WHERE THE SOUL AND HEART ARE Optimization Design of the Shell-and-Tube Heat Exchanger Thank You PUT ENERGY WHERE THE SOUL AND HEART ARE