Heat Fin ConductionGroup 2

Karthika Andrew, Shanelle CarterPawel Popiel

Introduction

Heat Fin ConductionEngine applicationHeat exchanger applicationOptimizing size and material

ObjectiveDetermine the optimum size and material for

a metal cooling finCompare IR thermometer and Thermocouple

for measuring fin surface temperatures

Safety PrecautionHot Plate

Do not touch the hot plate with bare hands Use the thermo glove to handle hot plate and fins

Do not store volatile flammable materials near a hot plate

Limit use of older hot plates for flammable materials.

Hot FinDo not place on combustible materialsDo not touch with handMake sure to place it where individual can not burn

themselves.

Material and Apparatus

• Hot plate• Copper, aluminum, steel tall and short fins with

hash marks• Hand-held thermocouple• IR thermometer• Thermal gloves

Material and Apparatus

ProceduresPlug in hot platePlace fin on hot plateOrient fin so temperature measurements can

be made easily on the large fin.Set control on hot plate to “200”.

Recommended to use the thermocouple to check temperature

Use thermocouple to measure the temperature along the fin at 1-inch increments (hash marks)The temperature must be at steady state

Procedures Cont.Repeat step 4 until steady state is reached

Group members are responsible for choosing the appropriate sampling interval for temperatures.

When steady state has been achieved, measure the temperature at each hash markUse both thermocouple and IR thermometer

With the Thermal GlovesRotate the fin (if necessary) and measure the temperature

profile in short fin Using both thermocouple and IR thermometers

Remove the fin Safely place fin where people are unlikely to burn themselves. Do not place fin on combustible material

Repeat steps 2-9 for each pair of fin

Comparison of the Three Materials

0.000.100.200.300.400.500.600.700.800.901.000

0.2

0.4

0.6

0.8

1Theoretical Temperature Profiles

Stainless Steel Copper AluminiumDimensionless Length

Dim

en

sion

less

Tem

per-

atu

re

Comparison Cont.

0.00

0.20

0.40

0.60

0.80

1.00

0.00

1.00

Aluminum Long Fin

ThermocoupleIRTheoretical

Dimensionless Length

Dim

en

sion

less

T

em

pera

ture

0.00

0.20

0.40

0.60

0.80

1.00

0.00

1.00

Aluminum Short Fin

ThermocoupleIRTheoretical

Dimensionless Length

Dim

en

sion

less

T

em

pera

ture

Comparison Cont.

0.00 0.20 0.40 0.60 0.80 1.000

1

Copper Long Fin

ThermocoupleIRTheoretical

Dimensionless Length

Dim

en

sion

less

T

em

pera

ture

0.00 0.20 0.40 0.60 0.80 1.000

1

Copper Short Fin

ThermocoupleIRTheoretical

Dimensionless Length

Dim

en

sion

less

T

em

pera

ture

Comparison Cont.

0.00

0.20

0.40

0.60

0.80

1.00

0.00

Stainless Steel Long Fin

ThermocoupleIRTHeoretical

Dimensionless Length

Dim

en

sion

less

T

em

pera

ture

0.00 0.20 0.40 0.60 0.80 1.000.000.200.400.600.801.00Stainless Steel Short

Fin

ThermocoupleIRTheoretical

Dimensionless LengthD

imen

sion

less

T

em

pera

ture

Comparison Cont.

Thermocouple IR0.00

100.00

200.00

300.00

400.00

500.00

600.00

700.00

800.00

900.00

1000.00

Rate of Heat Removal Long Fin

AluminiumCopperStainless Steel

BT

U/h

r

Thermocouple IR0.00

100.00

200.00

300.00

400.00

500.00

600.00

700.00

800.00

900.00

1000.00

Rate of Heat Removal Short Fin

aluminiumCopperStainless Steel

BT

U/h

r

Discussion: Best MaterialCopper had the most rate of heat transfer

and a better temperature profile.Not widely used

Costly Corrosive

Aluminum had the second highest heat transferWidely used

Cost Effective Less Corrosive

SizeTheoretically, the larger the surface area of

the fin, more heat is removed.Experimentally this was not the case.

Error may be caused by the corrosion on the fin Human Error

Thermocouple or IRThermocouple

Experimental data was closer to the theoretical values.

Reading is done upon contact on the surface.IR

Experimental and theoretical data had major discrepancies.

Reading was dependent on the amount of energy will emit.

ErrorMaterial

Oxidation The darker spots on the fin effected the temperature with

IR thermometer.Hash mark were not visible on Copper fin.

HumanNot having a steady hand to measure the temperature

with IR Thermometer and Thermocouple.Inaccurately measuring the fins.

Not picking the same measuring points

EquipmentInaccurate reading with the two devices.

ConclusionCopper is the best material to be used as a

cooling fin.Highest rate of heat removal

Aluminum is widely used material Cost effectiveLess corrosive

Thermocouple is a more reliable device to measure the heat fin’s dispersion of heat.Contact with the metal gave a more accurate

reading

Referencehttp://cnx.rice.edu/content/m10205/latest/http://www.mapleapps.com/categories/

mathematics/desolving/html/coolf6-.htmlhttp://enstrophy.colorado.edu/~mohseni/

ASEN3113Fall2002/FinEqDerivation1.pdf“Transport Processes and Separation Process

Principles”, 4th ed., C.J Geankoplis, (Prentice-Hall, New Jersey), 2003. ISBN 0-13-101367-X.

“Elementary Differential Equations and Boundary Value Problems,” 4th ed., W. E. Boyce and R. C. DiPrima, (John Wiley & Sons, New York), 1986.

“Numerical Methods for Engineers,” 5th ed., S. C. Chapra and R. P. Canale (McGraw-Hill, New York), 2006. ISBN 0-07-310156-7.

Thank You