Fin Design for Maximum Thermal Dissipation

1
Fin Design for Maximum Thermal Dissipation

• ME 450 Computer Aided Engineering Analysis
• Instructor Dr. Nema
• Group Members
• Wei-Yuan Chu, Brad Holtsclaw, Nick Metzger,
  Breanne Walters

2
Objectives

• Maximize Thermal Dissipation by Designing a Fin
  System that will Draw Heat Away from the Engine
  Casing
• Using Aluminum Alloy and Carbon Steel as
  Materials, we will analyze which material makes a
  better fin.

3
Introduction

• Engine is used to run a small blower
• It is assumed that the motor casing will be
  subjected to cooling by a fan or other suitable
  ventilation.
• Main area of concern is drawing heat into the fin
  system in order to dissipate it into the air.

4
Complete Assembly
Area of Interest
5
Theoretical Background

6
Theoretical Background (Cont.)
Where
Assuming Convection Heat Transfer _at_ xL
7
Model Details (Solid Modeling)

• Solid Models were created in Pro-Engineer and
  Converted to IGES Files to Import into Ansys

8
Model Details (Type I)

• SOLID 92 Element Type
• 5,829 Elements
• 10,706 Nodes

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Model Details (Type II)

• SOLID 92 Element Type
• 16,196 Elements
• 29,355 Nodes

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Model Details (Type III)

• SOLID 92 Element Type
• 16,196 Elements
• 29,355 Nodes

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Boundary Conditions

• Temperature of 65.56oC applied to Internal
  Surface to Simulate Operating Conditions

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Boundary Conditions (Cont.)

• Ambient Temperature of 10oC
• Film Coefficient of 100 W/moC (for cooling
  airspeed of 10 m/s)

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Results and DiscussionS.S. Temperature
Distribution (Type I) Steel Top Fins

• Carbon Steel Top Fins
• Max. Temp. in Fins is 55.078oC

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Results and Discussion S.S. Temperature
Distribution (Type I) Aluminum Top Fins

• Aluminum Top Fins
• Max. Temp. in Fins is 60.218oC

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Results and Discussion S.S. Temperature
Distribution (Type II) Steel Top Fins

• Steel Top Fins
• Max. Temp. in Fins is 50.885oC

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Results and Discussion S.S. Temperature
Distribution (Type II) Aluminum Top Fins

• Aluminum Top Fins
• Max. Temp. in Fins is 55.777oC

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Results and Discussion S.S. Temperature
Distribution (Type III) Steel Top and Side Fins

• Steel Top and Side Fins
• Max. Temp. in Fins is 50.885oC

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Results and Discussion S.S. Temperature
Distribution (Type III) Aluminum Top and Side
Fins

• Aluminum Top and Side Fins
• Max. Temp. in Fins is 55.777oC

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Results and Discussion Transient Response(Type
III) Aluminum Top and Side Fins
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Results and Discussion Top Fin Design Comparison
Solutions
STEEL
ALUMINUM
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Results and Discussion Side Fin Design
Comparison Solutions
STEEL
ALUMINUM
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Results and Discussion Heat Transfer Comparison
for Type III Design
Aluminum
Steel
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Impact Statements

• The Addition of Fins will Aid in the Heat
  Dissipation from the Motor Casing, making the
  Part More Safe for General Use
• Motor Casing with Type III Fins Will have a
  Reduced Surface Temperature and Less of a Chance
  of Overheating the Interior Electronics and
  Causing a Fire

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Conclusions

• Total Heat Transferred from Aluminum Fin is
  245.83 W Greater than that from the Steel Fin.
• Efficiency for Aluminum Fin is Greater than that
  of Steel.
• Aluminum is the Best Choice for the Fin Material.

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References

• Nematollahi, Khosrow. "Oncourse, ME 450."
  Scheduled Reading and Assignments. IUPUI. 23 Apr
  2007 lthttps//oncourse.iu.edu/access/content/user/
  knematol/Filemanager_Public_Files/ME450LectureNote
  sCh13rgt.
• Incropera, Frank, David Dewitt, and Theodore
  Bergman. Fundamentals of Heat and Mass Transfer.
  6th. Hoboken NJ Wilet Sons, 2007.
• Rengifo, Gustavo. "Oncourse, ME 546." ME 546
  Resources, Project 1. IUPUI. 23 Apr 2007
  lthttps//oncourse.iu.edu/access/content/group/SP07
  -IN-ME-546-26532/Lab20Projects/Projectgt.

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Questions