AQA P1 - Energy Efficiency In The Home?

Badges: 13
Report Thread starter 4 years ago
Part of the specification is to explain how...
-cavity wall insulation
-loft insulation
-draught proofing
-hot water tank jackets
-thick curtains
-double glazing

...reduce heat transfer.

However, every textbook I read and video I watch say that they cut out different types of heat transfer! E.g, one video will say that cavity wall insulation reduces convection and radiation, and another says it reduces conduction and radiation.
Could someone confirm what each of these instalments actually reduce?
Badges: 8
Report 4 years ago
(Original post by Tasha_140)
Could someone confirm what each of these instalments actually reduce?
Heat is lost through:
  • the roof - fit loft insulation
  • windows - fit double glazing and curtains
  • gaps around the door - fit draught excluders
  • the walls - fit cavity wall insulation
  • the floor - fit a carpet
Heat energy is transferred from homes by conduction through the walls, floor, roof and windows. It is also transferred from homes by convection. For example, cold air can enter a house through gaps in doors and windows, and convection currents can transfer heat energy in the loft to the roof tiles. Heat energy also leaves the house by radiation through the walls, roof and windows.

There are some simple ways to reduce heat loss, including fitting carpets, curtains and draught excluders. Heat loss through windows can be reduced by using double glazing. There can be either air or a vacuum between the two panes of glass. Air is a poor conductor of heat, while a vacuum can only transfer heat energy by radiation. Heat loss through walls can be reduced using cavity wall insulation. This involves blowing insulating material into the gap between the brick and the inside wall, which reduces the heat loss by conduction. The material also prevents air circulating inside the cavity, therefore reducing heat loss by convection. Heat loss through the roof can be reduced by laying loft insulation. This works in a similar way to cavity wall insulation.

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