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The four horsemen of heat transfer C ontents: Conduction Convection Evaporation Radiation.

Date post: 30-Dec-2015
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The four horsemen of heat transfer Contents: •Conduction •Convection •Evaporation •Radiation
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Page 1: The four horsemen of heat transfer C ontents: Conduction Convection Evaporation Radiation.

The four horsemen of heat transferContents:

•Conduction•Convection•Evaporation•Radiation

Page 2: The four horsemen of heat transfer C ontents: Conduction Convection Evaporation Radiation.

Conduction

TOC

Heat transfer by contactRandom wigglingHot to coldFlow rate T, A, material, 1/thickness

Simulation

Insulation prevents conductionDown/SyntheticsThickness

Demo – Ice Melter blocks. Start the radiation demo.

Page 3: The four horsemen of heat transfer C ontents: Conduction Convection Evaporation Radiation.
Page 4: The four horsemen of heat transfer C ontents: Conduction Convection Evaporation Radiation.

Convection

TOC

Heat carried away by moving fluidMuch faster than conductionSurface layers

Examples:Sauna/cold lakeCar radiatorCooling fans on computersWind chillFirestorms

Windbreakers slow down convectionDemo – Heat Sinks and smoke box with candle

Page 5: The four horsemen of heat transfer C ontents: Conduction Convection Evaporation Radiation.
Page 6: The four horsemen of heat transfer C ontents: Conduction Convection Evaporation Radiation.

Evaporation

TOC

Heat transfer by phase changeCooling process

Whee!

If you always lose the fastest…

ExamplesCooling towers @ PSUSweat

Poly layers keep skin dryCotton = death

Page 7: The four horsemen of heat transfer C ontents: Conduction Convection Evaporation Radiation.
Page 8: The four horsemen of heat transfer C ontents: Conduction Convection Evaporation Radiation.

Radiation

TOC

Hot objects radiate photons (black body radiation)Heating up a pokerBonfire/barn fire/stovesThe sunFrost

Silver lined blankets/bags reflect radiation back to you

Demo – check temperatures on radiation demo

Page 9: The four horsemen of heat transfer C ontents: Conduction Convection Evaporation Radiation.

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