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F R A N K K I V U Y O
M A R I A T A B B U T
D A V I D W I L L I A M S
L U I S C A S T R O
6/7/2013 1
Heat Pipe and Cooking Application
Section 88 Group 01
Advisors: John Spidel
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Goal
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To create a heat pipe used in a cooking application.This cooking pot will be more efficient in cooking time.
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Outline
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What is a heat pipe? Maria Tabbut Components of heat pipe Luis Castro
Working Fluid Wick Pipe
Building Luis Castro
Our Heat Pipe Frank Kivuyo
Materials
Testing Frank Kivuyo
Integration with cooking pot David Williams
The design of the cooking pot with the heat pipe
Results David Williams
Future Work Maria Tabbut
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What’s a Heat Pipe?
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A heat pipe is a device that transfers heat by using theprinciple of thermo conductivity. It manages the transfer of heat between solid surfaces.
Flow Cycle One end of the pipe is heated The working fluid will boil, vaporize and flow up the pipe. It will go to the top and condense Condensing releases the heat at the top The liquid will flow back down by capillary action in the wick Process repeats
Uses HVAC Computers Aerospace
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6/7/20135
Heat Pipe Flow Chart
Flow Chart of Heat Pipe [1]
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Pipe Working Fluid
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The pipe materialcan be chosen to
fit the givenapplication.
The shape doesn’thave to be round,it can be flat, suchas heat pipes incomputers.
Latent Heat of Vaporization
Temperatureranges for differentapplications
Examples: water,acetone, mercury
6
Components
Should be porous
Capillary driving
force
Wick
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Pipe
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The outside shell of theheat pipe.
Shapes of the pipe are alldifferent sizes Ex. In computers, typically
flat to fit into small area
Pipe can be made fromany kind of metal, such
as copper, silver,aluminum or stainlesssteel.
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Working Fluid
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Many factors consideredin choosing the workingfluid
One the useful
temperature range Latent Heat of
Vaporization
Pick one that works well with the pipe
Heat Pipe Working Fluids [2]
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Wick Structure
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Enables the workingfluid to move fromcondenser back toevaporator section
Necessary to be porousto hold the condensed air
Types of wicks include: [3]
Metal mesh
Grooved
Metal Sintered Powder
Pictures of the types of wicks [2]
Sintered
Metal Mesh
Grooved
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Our Heat PipeMaterials:
• Pipe and Caps
o Pipe length is1ft and 1/2in
wideo One regular cap
and a screw capo Pipe Volume :
32mL• Wick
o 20x20 CopperMesh
• Working Fluid
o 11mL of water• Teflon Tape
10 6/7/2013
Final Heat Pipe
MaterialsScrew Cap and Teflon Tape
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Building
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Spent lots of time in the machine shop
Used a lathe to cut the groveson the cap.
Soldered the copper capsonto the pipe
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Heat Pipe Testing
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Testing Setup
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Sensor : Reading theheat temp. at the top of
the heat pipe
Aluminum Foil: Tokeep the heat in a
concentrated area
Heater: Heating thepipe at the bottom
13
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Testing
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Heat Pipe Testing
Test 1 and 2: Failed• The heat pipe leaked water both times
Test 3 : Successful• The heat pipe was able to reach the temperature desired (100 C)
14
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Heat Pipe With Cooking Pot
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Initial Design
Final Design
Materials:• Stainless Steel Pot
o Used epoxy to puttogether
o Epoxy can
withstand heat of 550 F• Copper Heat Pipe
o Centered in themiddle
• Electric Heat Tapeo Wrapped around
the bottom of pipeo Can heat up to
400 F
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Cooking Pot Testing
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Setupo Plug in electrical tapeo Fill water to top of pot
o Approx. 4 gallons
o Connect sensoro Measure water
temp.
Results
Cooking Pot Testing Results Time (min.) Temp. (C )
0 27.7 5 29.7
10 31.9 15 32.8 20 33.3 25 33.8
The temperature difference in 25 min.
was 6.1 C. For the water to reach adesired temperature of 100 C, it would take about 8.5 hours. This time
is undesirable.
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Cooking Pot Results
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The heat pipe was not able to efficiently heat the water.
Drawbacks
The large pot volume Lack of insulation
Not time efficient
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Future Work
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o Continue with cooking pot testingo Less water
o Designing a tighter sealed cooking poto Changing the design of the pot
o dimensionso Changing the heat pipe
o Locationo type
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Questions?
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References
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[1] How A Heat Pipe Works, AAVID, [online] 2013, http://www.aavid.com/product-group/heatpipe/operate (Accessed: 4 May 2013)[2] P. Kew and D. Reay, Heat Pipes: Theory, Design and Applications, 5th Ed. Burlington: Buttenworth-Heinemann, 2006.