7. Insulation is used to reduce energy losses from houses. Insulating material often consists of fibres with
air between them. The diagram shows a section through some insulating material.
Cold Loft
air trapped
between fibres
Warm Room
(n)Explain how this type of insulation reduces energy loss by conduction.
(m) Explain how this type of insulation reduces energy loss by convection.
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Heat loss through windows can be reduced by using double glazing. These special windows have air or a vacuum between two panes of glass. If the double glazing has a vacuum there will be no conduction or convection. If the double glazing is made with air between the glass then convection is minimised because there is little room for the air to move. Air is a poor conductor so there will be very little heat loss by conduction.
Cavity wall insulation
Diagram showing a cross-section of a wall. There is a layer of insulation between the outer wall and the inner wall.
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