Heat transfer, insulation and energy saving

Heat is generally transferred in the following three ways.

• Conduction, convection, and insulation

• Convection, conduction and radiation

• Radiation, conduction, convention

What is conduction?

• The transfer without objects being in contact.

• The transfer of heat between solid objects.

• The transfer of heat by the movement of liquid or gas particles.

What is convection?

• The transfer without objects being in contact.

• The transfer of heat between solid objects.

• The transfer of heat by the movement of liquid or gas particles.

What is radiation?

• The transfer of heat between solid objects.

• The transfer without objects being in contact.

• The transfer of heat by the movement of liquid or gas particles.

The temperature of your body is about ....... degrees Celsius.

Fill in the number only.

Winter clothing is normally made of thermal insulators.

• True

• False

You feel cold because your body .............. heat.

Shiny surfaces are absorbers of heat.

• True

• False

Answer explanation

Shiny surfaces are reflectors of heat, which means that when radiation hits a shiny surface most of the radiant heat is reflected.

Choose the one of the options below to explain the following statement:

Dark surfaces are absorbers of heat.

• It means that when radiation hits a shiny surface most of the radiant heat is reflected.

• It means that when radiation hits a dark surface most of the radiant heat is absorbed.

Look at the picture provided. Are the pipes shown in the picture covered in insulating material?

• Yes

• No