An architect compares three designs for the outside walls of a building.

Each wall has the same area. The temperature difference across each wall is the same.

The Table shows information about the walls.

Table

Design	Material	Thickness in $cm\text{cm}$	Thermal conductivity in $K\text{W/m K}$
A	brick	20	0.70
B	brick	30	0.70
C	timber	20	0.15

Explain why design A would give a higher rate of cooling of the building than either design B or design C.

Explain why the information in the Table does not allow the architect to decide whether design B or design C gives the lower rate of cooling.

Explain why reducing the rate of cooling of the building reduces the energy that the heating system must supply each day.

An architect compares three designs for the outside walls of a building.

Each wall has the same area. The temperature difference across each wall is the same.

The Table shows information about the walls.

Table

Design	Material	Thickness in $cm\text{cm}$	Thermal conductivity in $K\text{W/m K}$
A	brick	20	0.70
B	brick	30	0.70
C	timber	20	0.15

Explain why design A would give a higher rate of cooling of the building than either design B or design C.

Explain why the information in the Table does not allow the architect to decide whether design B or design C gives the lower rate of cooling.

Explain why reducing the rate of cooling of the building reduces the energy that the heating system must supply each day.

3 Conservation of energy

3 Conservation of energy Questions