Heat Transfer

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in the Atmosphere ©2008 Norm Ivey Heat Transfer

What is Heat Transfer? <ul><li>Heat transfer is the movement of heat energy from one substance to another. </li></ul>

<ul><li>Heat (energy) always moves from a warmer substance to a cooler substance. </li></ul>What is Heat Transfer? Hot Cold

<ul><li>Heat will continue to move until both substances are the same temperature. </li></ul>What is Heat Transfer? Hot C...

<ul><li>The greater the difference in temperature between the substances, the faster the heat will transfer. </li></ul>Wha...

<ul><li>There are three types of heat transfer: </li></ul><ul><ul><li>Conduction </li></ul></ul><ul><ul><li>Convection </l...

Examples <ul><li>You touch a black car in the summer and the heat from the car transfers into your hand. </li></ul><ul><li...

Conduction <ul><li>Heat transfer by conduction is the transfer of heat through direct contact. </li></ul>

Conduction <ul><li>Molecules transfer energy to the molecules next to them. </li></ul>

Conduction <ul><li>The molecules do not have to be the same substance. </li></ul>http://www.theelusivefish.com/articles/wp...

Example 1 http://www.vernier.com/caliper/fall07/images/heat_transfer_large.jpg The metal conducts heat from the cup of ...

Your Coke becomes cold because the heat from the soda transfers into the ice, not the other way around. http://www.photo...

No matter what it feels like, cold does not transfer into your body. What is really happening here? Why do you wear heavy ...

Radiation <ul><li>Heat transfer by radiation is the transfer of heat through electromagnetic waves. </li></ul>http://www.n...

Radiation <ul><li>There is no direct contact between the substances. </li></ul>

http://www.blog.thesietch.org/wp-content/uploads/2007/04/earth.jpg http:// stardate.org/images/gallery/sun5.jpg Heat from ...

http://www.lifefamilytraining.com/img/roasting-marshmallows.jpg Example 2 The heat from the campfire transfers into your ...

Convection <ul><li>Heat transfer by convection is the transfer of heat through the fluid (liquids and gases) movement of c...

Convection <ul><li>Warm fluids rise, cool down, sink, and then are warmed again. </li></ul>

http://www.eeb.ucla.edu/test/faculty/nezlin/Lecture1/Fig0803.jpg The radiator warms the room by warming the air around it....

http://physics.uoregon.edu/~jimbrau/BrauImNew/Chap07/FG07_03.jpg As air above the road warms up, it rises and is replaced ...

http://www.aos.wisc.edu/~aalopez/aos101/wk5/heatrans.jpg This picture illustrates all three type of heat transfer. Can you...

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