thermal dissipation
TRANSCRIPT
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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
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Objectives
Maximize Thermal Dissipation by
Designing a Fin System that will DrawHeat Away from the Engine Casing
Using Aluminum Alloy and Carbon Steel
as Materials, we will analyze whichmaterial makes a better fin.
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Introduction
Engine is used to run a small blower
It is assumed that the motor casing will besubjected 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.
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Complete AssemblyArea of Interest
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Theoretical Background
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Theoretical Background (Cont.)
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Model Details (Solid Modeling)
Solid Models were created in Pro-Engineer and
Converted to IGES Files to Import into Ansys
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Model Details (TypeI)
SOLID 92Element Type
5,829 Elements
10,706 Nodes
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Model Details (TypeII)
SOLID 92Element Type
16,196 Elements
29,355 Nodes
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Model Details (TypeIII)
SOLID 92Element Type
16,196 Elements
29,355 Nodes
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BoundaryConditions
Temperature of65.56oC applied to
Internal Surface to
Simulate Operating
Conditions
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BoundaryConditions (Cont.)
AmbientTemperature of10oC
Film Coefficient of100 W/m*oC (forcooling airspeedof 10 m/s)
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Resultsand Discussion:
S.S. Temperature Distribution
(TypeI) SteelTop Fins
Carbon
Steel TopFins
Max.
Temp. in
Fins is
55.078oC
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Resultsand Discussion:
S.S. Temperature Distribution
(TypeI) AluminumTop Fins
Aluminum
Top Fins Max.
Temp. in
Fins is60.218oC
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Resultsand Discussion:
S.S. Temperature Distribution
(TypeII) SteelTop Fins
Steel Top
Fins Max.
Temp. in
Fins is50.885oC
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Resultsand Discussion:
S.S. Temperature Distribution
(TypeII) AluminumTop Fins
Aluminum
Top Fins Max.
Temp. in
Fins is55.777oC
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Resultsand Discussion:
S.S. Temperature Distribution
(TypeIII) SteelTopand Side Fins
Steel Top
and SideFins
Max.Temp. in
Fins is50.885oC
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Resultsand Discussion:
S.S. Temperature Distribution
(TypeIII) AluminumTopand Side Fins
Aluminum
Top andSide Fins
Max.Temp. in
Fins is55.777oC
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Resultsand Discussion:
TransientResponse
(TypeIII) AluminumTopand Side Fins
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Resultsand Discussion:Top Fin Design
Comparison Solutions
Length (m) thickness width (m) Lc t P h k
0.019 0.002 0.210 0.020 0.002 0.423 100.000 53.000
Af Ab At m nf b qt
0.008 0.013 0.064 43.644 0.800 0.632 55.410 651.498
Length (m) thickness width (m) Lc t P h k
0.019 0.002 0.210 0.020 0.002 0.423 100.000 252.000
Af Ab At m nf b qt
0.008 0.013 0.064 20.015 0.900 0.290 55.410 679.434
Steel Top Fins
Aluminum Top Fins
Temperature Distribution (Top Fins)
0
0.2
0.4
0.6
0.8
1
1.2
0 0.01 0.02 0.03 0.04 0.05
Length (m)
/b
Aluminum
Steel
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Resultsand Discussion: Side Fin Design
Comparison Solutions
Length (m) thickness width (m) Lc t P h k
0.051 0.004 0.229 0.053 0.004 0.465 100.000 53.000
Af Ab At m nf b qt
0.024 0.010 0. 083 30.959 0. 580 1.173 55. 410 583. 892
Length (m) thickness width (m) Lc t P h k
0.051 0.004 0. 229 0.053 0. 004 0.465 100. 000 252. 000
Af Ab At m nf b qt
0.024 0.010 0. 083 14.198 0. 850 0.538 55. 410 801. 786
Steel Side Fins
Aluminum Side Fins
Temperature Distribution (Side Fins)
0
0.2
0.4
0.6
0.8
1
1.2
0 0.01 0.02 0.03 0.04 0.05
Length (m)
t/tb
Aluminum
Steel
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Resultsand Discussion: HeatTransfer
Comparison forTypeIII Design
Top Fins (W) Top Fins (W)
Side Fins (W) Side Fins (W)
Total (W) Total (W)
q (W) 245.830
1481.220 1235.390
583.892
651.498
Total Heat Transferred by Aluminum Fins Total Heat Transferred by Steel Fins
679.434
801.786
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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 Electronicsand Causing a Fire
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References
Nematollahi, Khosrow. "Oncourse, ME 450." Scheduled Reading and Assignments.IUPUI. 23 Apr 2007
.
Incropera, Frank, David Dewitt, and Theodore Bergman. Fundamentals of Heat andMass Transfer. 6th. Hoboken NJ: Wilet & Sons, 2007.
Rengifo, Gustavo. "Oncourse, ME 546." ME 546 Resources, Project #1. IUPUI. 23Apr 2007 .
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Questions