One of the reasons to to prevent condensation on the windows, and
another is to warm the air around the leaky window.

You generally have radiators on the outside walls so the convection
keeps the entire roomful of air at the same temperature.

If you place the radiators on the interior walls then you get an
inversion effect where the hot air rises and stays there, and the cool
air from the outside lays on the floor near the walls.  There is some
movement as the cool air creeps to the radiator, but it's not as fast.

Even if it were faster, there would be a noticeable and significant
difference in temperature closer to the outside than the inside.

-Adam

On 5/22/07, Russell McMahon <rusl@paradise.net.nz> wrote:
> A friend asks:
>
> Industry practice is to locate heating radiators (most often fed via a
> reticulated hot water system) under windows.
>
> Nobody can tell me why this is done and to my mind it would perhaps be
> the
> worst place from an energy efficiency point of view although there may
> be
> other reasons (like reducing convective draughts within the room  -
> which
> can reduce the apparent temperature by several degrees) why it is a
> good
> idea.
>
> I would hence appreciate your commentary as to what you would expect
> to be
> the optimum location for a radiator and why.
>
> Any thoughts?
>
>
>
>         Russell
>
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