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Heat_Transfer_notes

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					Heat Transfer
   NOTES
   By: Laura LeMay
Thermal Energy
 •TOTAL energy of
motion in molecules of
     a substance
    (therm=heat)
  Temperature
• Average amount of energy
         in motion




* Measured with a thermometer
HEAT Energy Transfers…

 •from hotter
    object to
COLDER object
    hot   Heat   cold
      3 types of heat Transfer
1) Radiation: infrared (not visible) and felt
  as heat


2) Conduction: transfer of heat by touch


3) Convection: transfer of heat by
  movement of fluid (liquid/gas)
    Type         Definition    Examples:

Radiation     •infrared (not
                    visible)
              •felt as heat
Conduction •transfer of
              heat by
              touch
Convection transfer of heat
              by movement
              of fluid
              (liquid/gas)
      Radiation (infrared)
• Examples:
                         *Feel warmth on
                          face from sun=
                          solar radiation
* Warmth of a fire


               * Heat off car engine
More examples of radiation

                •Heated
               driveways/
               sidewalks

             * Heated floors
          Conduction=touch
• Examples:

                        * Hot sand on feet
      * Touching hot light bulb
      •       * Touching metal on hot seatbelt

      * Stove to pan handle


               * Melting ice in hand
    Convection
* Convection in water




           * Convection oven
          * Holiday chimes




* Spinning Lamps
LOOK AT ALL THREE:
     Heat Transfer in the
        Troposphere

      * convection
                           radiation
             * CONVECTION is the most
             dominant heat transfer in the
             troposphere


conduction
         Temp Conversions
                    • Pop test
• 1) 4 C --------------------- ______ F

• 2) 7 C ---------------------- ______ F

• 3) 14 F -------------------- ______ C

• 4) 0 C --------------------- ______ F

• 5) 21 F ------------------- ______ C

				
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posted:9/15/2011
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