Heat Transfer

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  • Created by: ambxrose
  • Created on: 30-03-15 14:03
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  • Heat Transfer
    • Heat is transferred in three different ways
      • radiation
        • the transfer of heat energy by infrared radiation
          • infrared radiation can be emitted by solids,liquids or gases
      • conduction
        • involves the transfer of energy by particles
        • the main form of heat transfer in solids
      • convection
        • involves the transfer of energy by particles
        • the main form of heat transfer in liquids and gases
    • Infrared Radiation
      • All objects are continually emitting and absorbing infrared radiation
      • An object that's hotter than it's surroundings emits more radiation than it absorbs
      • An object that's cooler than its surroundings absorbs more radiation than it emits
    • Radiation depends on surface colour and texture
      • dark, matt surfaces absorb infrared radiation well and also emit lots of infrared radiation
      • light shiny surfaces reflect the infrared radiation

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