reducing energy loss

• Reducing unwanted energy transfers

  1. Using thermal insulation

  2. Using lubrication
• Reducing heat loss in a house

  1. Make the house sealed closed to prevent air passing out (reduce heat loss by convection)

  2. Reduce heat loss by conduction through walls and windows (use materials with low thermal conductivity, cavity walls with insulating foam)

  3. Reduce heat loss through windows (use double glazing)
• Conduction


  Heat is lost directly through a solid like a wall or a window
• Convection


  Heat is transferred through liquids and gases
• Friction


  The resistance that an object encounters when moving over a solid or through a fluid
• Friction reduces


  The efficiency of energy transfer and can cause objects to heat up
• Reducing friction

  1. Adding oil (a lubricant) to reduce friction (e.g. between cogs and chain of a bicycle)

  2. Making cars and planes streamlined to reduce air resistance friction
• Reducing friction allows vehicles to use less fuel and become more efficient