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Copy of Heat Transfer

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marty baker

on 16 April 2010

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Transcript of Copy of Heat Transfer

3 Methods of Heat Transfer Convection Conduction Radiation During the process of conduction,
the heat excites the molecules at
one end, starts them moving, and
transfers the energy from hot to cold. Why do you think this person
is wearing a glove? Air or water can be heated
and then sperad that heat
throughout the rest of the
"fluid" by a process known as
convection. In convection, the
wamer "fluid" rises, spreads
out, cools down, and sinks
to be warmed again.
Heat can be transferred by
waves. This is known as radiation.
Radiation is energy. The energy
is not converted into heat until
it comes in contact with matter.
The object creating the heat is not
in contact with the object that is
feeling the heat. How is it possible to walk
on burning coals without
getting burnt? Why is the heater located on the floor?

Draw a similar diagram of an air conditioning
unit showing location of unit and air flow. Why in the desert is
it very hot in the day,
but cold at night? The source of all energy What is heat? When we think of radiation
we normally think of the sun's rays. There are several different types of radiation. All in the form of energy waves This diagram shows what happens to solar radiation as it enters the Earth's atmosphere and
hits land. When a pot of water is on
a stove, the bottom layer is
heated by conduction. Then, the
process of convection spreads the
heat throughout the rest.
The hot water rises As is cools, it sinks, and gets
heated again. The same is true with air. Here it is on a much larger scale. During conduction, the molecules that are heated
are moving faster than normal A chain reaction begins. The hotter molecules bounce into
the colder molecules causing them to move faster. This continues until the heat has been transferred to the colder molecules.
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