1. 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

2. 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

3. 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

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

5. 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

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

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

8. 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

9. 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 :

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

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

12. 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

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

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

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

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

17. 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

18. 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