Keeping a house warm heat moves from regions of high temperature to regions of lower temperature

the thermogram of a house shows where the heat is lost and this costs and and

it is essential to reduce these losses because we can save money save energy resources reduce pollution reduce global warming In a normal house reductions can be made if we make it more difficult for heat to move around ……. we can do this by …….

Hot objects always lose heat heat transfer CANNOT be stopped heat transfer can only be REDUCED by loft insulation cavity wall insulation carpets draught excluder double glazing so what about radiators …………………???

a ‘radiator’ heats a space by convection a lot of air moves about – gaining heat then losing heat then gaining heat again and so on a ‘radiator’ heats a space by convection

the wall is an object so it will receive radiant heat as well and by radiation as well

this INCREASES the radiant heat available in the room putting shiny foil behind the radiator REFLECTS radiant heat back into in the room this INCREASES the radiant heat available in the room

Hot objects always lose heat to sum all this up heat transfer CANNOT be stopped heat transfer can only be REDUCED there are 3 ways that heat is transferred conduction (solids only) convection (liquids and gases) radiation loft insulation cavity wall insulation carpets draught excluder double glazing REDUCE heat loss

just remember

So keep your house warm!! That’s all folks! - 40°C outside + 2°C inside not enough heat from the small lamp and the people to melt much ice and the floor is often covered in animal skins