Thermal Energy Transfer
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Transcript of Thermal Energy Transfer
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THERMAL ENERGY TRANSFER
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Thermal Energy Transfer Thermal Energy can be
transferred by three methodsConductionConvectionRadiation
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Conduction Conduction is the transfer of thermal
energy by contact between particles of matter from a high temperature to a low temperature
Heat moves faster through solids and liquidsThis is because the particles are
closer together
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Convection Convection is the transfer of thermal energy
by the partcles of a fluidFluids are liquids and gasesCurrents transfer heat from high
temperature to low temperatureAs a fluid heats up it expands and
becomes less denseThis heated fluid will then rise above fluid
of a lower temperature
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Radiation Radiation is the transfer of energy by
electromagnetic wavesIt can travel through space where
there is no matterThis is radiant energy
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Radiation
Materials can absorb, reflect, or transmit radiationDark colors absorb radiationLight colors reflect radiation
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Radiation can pass through the particles that make up solids liquids and gases
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Insulators An insulator is a substance that heat
flows slowly through They will have a high specific heat Gases make good insulators because
they do not conduct heat well
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THERMODYNAMICS
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Using Heat On of the most basic ways of using heat
is to heat your home Most homes used a forced air system
that pumps warm air into a room and heat the room by convection
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Radiators Older buildings may use radiators A radiator uses steam to heat rooms by
convection
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Thermodynamics You can increase the thermal energy of
an object with out adding heat
Thermodynamics is the study of the relationship between thermal energy, heat, and work
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1st Law of Thermodynamics The increase in thermal energy of a
system equals the work done on the system plus the heat transferred to the system
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2nd Law of Thermodynamics It is impossible for heat to flow from a
cool object to a warmer object unless work is done.
If you hold ice in your hand, heat flows from you to the ice cube
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Engines Heat can be converted into work A heat engine is a device that turns heat
into work It is impossible to make an engine that
completely converts heat into work This is because it will violate the second
law of thermodynamics