Introduction to Heat Transfer

Contributed by:

Jonathan James Fri, Jan 21, 2022 07:49 PM UTC

Conduction, Convection, Radiation

1. HEAT TRANSFER

2. Thermal energy transfer is heat
moving from a warmer object to
a cooler object.

3. How is Heat Transferred?
There are THREE ways heat can
move.
– Conduction
– Convection
– Radiation

4. CONDUCTION
Heat is transferred from one
particle of matter to another in
an object.
 Conduction = CONTACT

5. Have you ever…
 Touched a metal spoon sitting in a pan of
boiling water only to be surprised by HOW hot
it is?
What conducts heat better,
metal or nonmetal? Why?

6. EXAMPLE OF CONDUCTION
A piece of cheese melts as heat
is transferred from the meat to
the cheese (Contact)

7.  Convection is the movement that
transfers heat within fluids
 Fluids = anything that flows
 Heat is transferred by currents within
the fluid or gas

8. Examples of Convection:
Have you ever noticed that the
air on the second floor of your
house is warmer than the first
floor? Or that water in a pool
is cooler at the deep end?

9. Examples of Convection
 Convection currents
cause the cooler
breezes you
experience by a
large body of water.
 These currents also
cause the movement
of magma within the
earth.

10.  Radiation is the transfer of energy by waves
What type of waves?
ELECTROMAGNETIC
 Radiation does NOT require matter to
transfer thermal energy

11. Radiation May Come From
Other Sources
Have you ever sat too close to a campfire?
You’re enjoying the warmth ….. only to
notice that your skin is really warm?

12. Examples of RADIATION
1. Fire
2. Heat Lamps
3. Sun

13. As a group come up with two
ideas/inventions where
conduction, convection or
radiation can be used to make
society better.
Does not have to be real, but must be
realistic!
Be able to explain how this type of
heat transfer works and makes society
better.

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