lesson 10 cooling of buildings

Question 1

what is thermal conductivity

Answer 1

the higher the thermal conductivity of a material, the higher the rate of energy transfer (work done) by conduction across the material

Question 2

modern houses are built from which 2 layers

Answer 2

external brick

internal breezeblock

Question 3

2 ways to reduce thermal energy transfer from a house

Answer 3

-construct the building using materials with a low thermal conductivity

-build the house with thick walls as this also reduces the rate of thermal energy transfer

Question 4

what do builders pack the cavity with

Answer 4

insulating material

Question 5

why do builders pack the cavity with insulating material

Answer 5

as it has a very low thermal conductivity

Question 6

insulating reduces the overall conductivity of the wall by how much

Answer 6

10x

Question 7

single glazed windows have what

Answer 7

high thermal conductivity

Question 8

double glazed windows are better than single glazed windows, how

Answer 8

as it has a lower thermal conductivity

Question 9

what does loft insulation do

Answer 9

reduce the thermal energy that can escape through the roof of the house

Question 10

what does loft insulation have

Answer 10

a low thermal conductivity