Heat Transfer

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Heat Transfer
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Processes of Heat Transfer

• There are three processes of heat transfer
• Radiation Doesnt need particles wave energy
• Conduction Movement of heat in solids and
  liquids by movement of particles.
• Convection Movement of heat in solids, liquids
  and gasses by movement of particles.

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Common Examples

• Radiation heat from a fire sunlight
• Convection boiling water air currents
• Conduction frying pan pots

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Ways to Heat our Homes
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• Firewood
• Oil
• Electricity
• Hot water Radiation
• Geothermal
• Heat Pumps
• Solar

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Types of Insulating Technologies
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• Animal fur
• Refrigerator
• Thermos
• Fiberglass insulation
• Sod
• newspaper

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Insulators vs. Conductors

• Insulators are materials that slow down heat
  loss. Eg. Your winter coat
• Conductors allow heat to move easily. Eg. A
  Frying pan.

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• http//www.youtube.com/watch?vpyfM_fKSICE

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Specific Heat Capacity

• The amount of heat energy that a substance can
  hold is called specific heat capacity. Substances
  with large heat capacities will take longer to
  warm up and cool down. The unit is J/g oC.

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Specific Heat Capacities
Substance Heat Capacity (J/g0C)
Water 4.18
Alcohol 2.43
Dry Soil 0.80
Steel 0.42
Wood 1.71
Which of the materials above looses heat fastest?
Which one looses heat slowest?
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• Design A method to keep snow and ice off your
  drive way. Draw a sketch or make a model of what
  it would look like.

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Careers in Heat

• There are many jobs that a person might have that
  involve heat and temperature.
• Furnace repair person
• Light bulb manufacturer
• Blacksmith
• Volcanologist
• Glass blower

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Business Card

• Using a computer, create a business card for a
  person with a career associated with heat and
  temperature. Include responsibilities required
  for the job.