P 1.4 Heating and insulating buildings Flashcards
(11 cards)
What is the purpose of insulation in buildings?
To reduce the rate of energy transfer (heat loss) from the inside to the outside.
What is thermal conductivity?
A measure of how easily heat passes through a material.
How does a lower thermal conductivity affect energy transfer?
Lower thermal conductivity means slower heat transfer through the material.
How does wall thickness affect the rate of heat loss?
Thicker walls reduce the rate of heat loss by increasing the distance heat must travel.
What is meant by the thermal insulation of a building?
Materials and techniques used to reduce heat loss from a building.
How does loft insulation reduce heat loss?
It traps air between insulating fibres, reducing conduction and convection.
How does cavity wall insulation work?
Foam or insulating material fills the gap between walls, reducing conduction and convection.
What is double glazing and how does it reduce heat loss?
Two glass panes with an air or gas layer between them reduce conduction and convection.
Why is air (or gas) used in insulation like double glazing?
Air is a poor conductor and reduces heat transfer by both conduction and convection.
What makes some insulation methods more effective than others?
The type of material, thickness, and trapped air — all affect how much energy is saved.
Why is it important to insulate buildings?
To reduce energy consumption, save money, and lower carbon emissions.
