cooling of a buildings

• What does the photograph in the video illustrate?

  The difference in thermal energy loss between a poorly insulated and a well-insulated building
• What is the first main factor affecting how quickly a building cools down?

  The thermal conductivity of the walls
• How does thermal conductivity affect energy transfer?

  The higher the thermal conductivity, the higher the rate of energy transfer by conduction
• What are modern houses typically built from?

  An external brick wall and an internal Breeze block wall
• What is the purpose of packing the cavity between walls with insulating material?

  To reduce the overall thermal conductivity of the wall
• How much can insulating material reduce the overall thermal conductivity of a wall?

  By up to 10 times
• How do single glazed windows compare to double glazed windows in terms of thermal conductivity?

  Single glazed windows have a higher thermal conductivity than double glazed windows
• What is one way to reduce thermal energy loss through the roof?

  By using loft insulation
• What characteristic does loft insulation have that helps reduce thermal energy transfer?

  It has a low thermal conductivity
• What is the second method to reduce thermal energy transfer from a house?

  Building the house with thick walls
• What are the two main factors that affect the cooling of a building?

  • Thermal conductivity of the walls
  • Thickness of the walls
• What is the overall goal of using materials with low thermal conductivity in building construction?

  To reduce the rate at which thermal energy passes through and escapes from the house