Slides in this set
Sometimes we want to transfer heat
effectively from one place to another.
· At other times we want to reduce the rate
of heat loss as much as we can.
· To be able to do either of these things we
need to know how heat is transferred and
which methods of heat transfer are most
important in particular cases.…read more
to evaluate ways in which heat is transferred in
and out of bodies
and ways in which the rates of these transfers
can be reduced.
Thermal (infra red) radiation is the transfer of energy
by electromagnetic waves.
All bodies emit and absorb thermal radiation.
The hotter a body is the more energy it radiates.
Dark, matt surfaces are good absorbers and good
emitters of radiation.
Light, shiny surfaces are poor absorbers and poor
emitters of radiation.…read more
The transfer of energy by conduction and convection
involves particles and how this transfer takes place.
Under similar conditions different materials
transfer heat at different rates.
The shape and dimensions of a body affect
the rate at which it transfers heat.…read more