DO RADIATORS WORK?
We’ve seen before that despite their name, radiators
actually provided most of their heat not by radiation,
but by convection.
The regular practice of situating radiators underneath
windows has come about not simply to counteract cold
down draughts but also because of the high heat loss
through glazed areas.
Heat energy will always travel from a hot surface to
a colder one. In this instance the coldest surface is
likely to be the window-the least well insulated surface.
It is a common misconception, even among professionals,
that ‘heat rises’. In reality, hot air rises
and cold air falls due to differences in air density.
This effect will tend to create a series of stratified
temperature layers which in turn creates draughts.