Heat Pipe Presentation (1)

7/28/2019 Heat Pipe Presentation (1)

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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



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.



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



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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Heat Pipe Flow Chart

Flow Chart of Heat Pipe [1]



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



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.



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]



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



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



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



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



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



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



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.



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



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



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.

http://www.aavid.com/product-group/heatpipe/operate





Heat Pipe Presentation (1)

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