Heat Transfer

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  • Created by: Rosie 3
  • Created on: 18-05-15 18:23
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  • Heat Transfer
    • Conduction
      • Needs particles
      • Metals: GOOD conductors
      • Non-metals & gases: POOR condutors
        • INSULATOR
      • From hot end of an object to cold end
      • Free electrons LEAVE atoms
        • Positive ions left behind
        • Move through structure of metal, colliding with ions as they go
      • Ions packed tightly
        • Vibrate continually
          • Hotter metal: more kinetic energy
    • Convection
      • Cool air denser: falls
      • Liquids & Gases
        • Expand when heated
          • Particle GAPS get wider (NOT particles)
      • Need particles
      • Hot air less dense: rises
    • Radiation
      • NO particles needed
      • Works through vacuums
      • Black surface: Good absorber & emitter
      • White surface: Poor absorber & emitter
    • Insulation
      • Double glazing
      • Cavity wall insulation
      • Loft Insulation

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