reducing unwanted energy transfers

• What is the main focus of today's video?

  Reducing unwanted energy transfers
• What are the two methods discussed for reducing energy loss?

  Thermal insulation and lubrication
• Why is it important to reduce heat energy loss in homes?

  To keep homes warm in cold weather
• What is convection?

  Heat transfer through liquids and gases
• How do foam seals help in energy conservation?

  They prevent air from escaping the home
• What is conduction?

  Heat loss through a solid
• What materials are used for thick walls to reduce heat loss?

  Materials with low thermal conductivity
• What are cavity walls?

  Two layers of bricks with an air gap
• Why is air considered a poor conductor of heat?

  Because it does not transfer heat well
• What is the issue with having an air gap in cavity walls?

  It allows convection to occur
• How does insulating foam improve energy efficiency?

  It reduces convection and conduction
• What is the difference between single and double glazing?

  Single has one pane, double has two
• How does double glazing reduce heat loss?

  It has an air gap that reduces conduction
• What is friction?

  Resistance when moving over a solid
• Why is reducing friction important for energy efficiency?

  It prevents energy loss and overheating
• How does lubrication help in reducing friction?

  By adding oil to moving parts
• How does streamlining vehicles affect energy efficiency?

  It reduces air resistance and fuel use
• What is the effect of friction on a bicycle's performance?

  It makes pedaling harder
• What are the key methods to reduce unwanted energy transfers in buildings?

  • Use thermal insulation
  • Apply lubrication
  • Seal gaps to prevent convection
  • Use materials with low thermal conductivity
• What are the advantages of double glazing over single glazing?

  • Reduces heat loss through conduction
  • Provides better insulation
  • Minimizes energy costs
• What are the consequences of friction in mechanical systems?

  • Reduces efficiency of energy transfer
  • Causes heating of moving parts
  • Increases energy consumption
• How can you suggest improvements for energy efficiency in a home?

  • Install insulation in walls and roofs
  • Use double glazing for windows
  • Seal gaps around doors and windows
  • Lubricate moving parts in appliances