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in the Atmosphere. Thermal Energy Transfer. What is Thermal Energy Transfer?. There are three types of thermal energy transfer: Radiation Conduction Convection. Radiation. Heat transfer by radiation is the transfer of heat through electromagnetic waves.

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in the atmosphere

in the Atmosphere

Thermal Energy Transfer

what is thermal energy transfer
What is Thermal Energy Transfer?
  • There are three types of thermal energy transfer:
    • Radiation
    • Conduction
    • Convection
radiation
Radiation
  • Heat transfer by radiation is the transfer of heat through electromagnetic waves.

http://www.nmsu.edu/~safety/images/fire_meaney.gif

radiation1
Radiation
  • There is no direct contact between the substances.
slide5

Radiant Energy from the sun radiates through

empty space to earth.

http://stardate.org/images/gallery/sun5.jpg

http://www.blog.thesietch.org/wp-content/uploads/2007/04/earth.jpg

slide6

Radiant Energy from the sun consists of :

Visible Light

Ultraviolet Light- has a shorter wavelength than visible light and can cause sunburn and skin cancer

Infrared Radiation-has longer wave length than visible light and is felt as heat

slide7

ENERGY ON EARTH

  • Not all of the sun’s energy reaches the Earth’s Surface.
  • 20% of the Sun’s Energy is ABSORBED by gases and particles in the Atmosphere.
    • Ozone, Oxygen & Water Vapor absorb ultraviolet light
    • Water and carbon dioxide(CO2) absorb infrared light.
  • Earth’s Atmosphere (clouds) and the surface of the Earth REFLECTSabout 30% of Sun’s radiation
  • About 50% of the Sun’s radiation is absorbed by the Earth's Surface
slide9

RADIATION BALANCE

Earth’s temperature remains stable because of the balance between the amount of radiation coming from the Sun and the amount going out from Earth.

Land, trees, and the oceans absorb and emit solar radiation mainly in the form of infrared radiation.

slide10

THE GREENHOUSE EFFECT

Glass allows sunlight into a green house. It prevents infrared radiation from escaping which keeps the greenhouse warm

slide11

THE GREENHOUSE EFFECT

Certain gases, such as CO2, in the atmosphere act like the glass in a greenhouse warming the atmosphere.

what is thermal energy transfer1
What is Thermal Energy Transfer?
  • Thermal energy transfer is the movement of heat energy from one substance to another.
  • Heat (energy) always moves from objects with high temperature to objects with low

Cold

Hot

what is thermal energy transfer2
What is Thermal Energy Transfer?
  • Heat will continue to move until both substances are the same temperature.

Warm

Warm

what is thermal energy transfer3
What is Thermal Energy Transfer?
  • The greater the difference in temperature between the substances, the faster the heat will transfer.
slide15

http://www.photoanswers.co.uk/ImgGalleryTn/91/10191/2417_16333.jpghttp://www.photoanswers.co.uk/ImgGalleryTn/91/10191/2417_16333.jpg

Your Coke becomes cold because the heat from the soda

transfers into the ice, not the other way around.

slide16

No matter what it feels like, cold does not transfer into your body.

What is really happening here?

Why do you wear heavy clothes when it’s cold outside?

http://www.alaska-in-pictures.com/data/media/9/man-in-extreme-cold_355.jpg

examples
You touch a black car in the summer and the heat from the car transfers into your hand.

A breeze makes you feel cooler because the wind transfers heat away from your body.

You feel the cold of a winter day because the cold air transfers into you.

Your Coke in a cooler gets cold because the cold from the ice moves into the Coke.

Examples

Anti-Examples

conduction
Conduction
  • The transfer of thermal energy by the collisions between particles of matter. (through direct contact).
  • Molecules transfer energy to the molecules next to them.
conduction1
Conduction
  • The molecules do not have to be the same substance.

http://www.theelusivefish.com/articles/wp-content/uploads/2007/09/hot-stove.jpg

conduction2
Conduction
  • Thermal energy is CONDUCTEDfrom the warm ground to the air above it.
slide21

As air above the road warms up, it becomes less dense and rises and is replaced by

cooler air, forming a convection current.

http://physics.uoregon.edu/~jimbrau/BrauImNew/Chap07/FG07_03.jpg

convection
Convection
  • Heat transfer by convection is the transfer of thermal energy (heat) through the fluid (liquids and gases) movement of currents.
convection1
Convection
  • Warm fluids rise, cool down, sink, and then are warmed again.
slide24

http://www.eeb.ucla.edu/test/faculty/nezlin/Lecture1/Fig0803.jpghttp://www.eeb.ucla.edu/test/faculty/nezlin/Lecture1/Fig0803.jpg

The radiator warms the room by warming the

air around it. Then the warm air transfers heat

to the rest of the room through convection.

slide26

http://www.aos.wisc.edu/~aalopez/aos101/wk5/heatrans.jpg

This picture illustrates all three type of heat transfer.

Can you identify them all?

slide27

Conduction

Convection

Radiation

http://www.aos.wisc.edu/~aalopez/aos101/wk5/heatrans.jpg