Reducing Energy Waste

• Lubrication

  • Oil in a motor
  • Reduces friction
  • So less energy is lost through friction
• Thermal Insulation

  • Double glazing
  • Less useful thermal energy lost
• Single Vs Double Glazing?

  • single glazed windows only have one pane of glass
  • double glazed have two panes of glass
  • Panes of glass reduce heat loss by convection
• What is the benefit of double glazed windows?

  Small air gap between the two panes of glass, which minimises conduction (as air is poor conductor of heat)
• What is friction?

  The resistance that an object encounters when moving across a solid, or moving through a liquid
• Why does cavity wall insulation contain pockets of air?

  Air is a good insulator
• What is the purpose of putting insulating foam in cavity walls?

  To minimise air convection currents
• What type of heat loss do foam seals around windows and doors help to minimise?

  Heat loss by convection