Onetap wrote
It makes no mention of the very valid reasons for placing heat emitters under windows
No s**t Sherlock. Valid maybe for old single glazing.
Not for modern highly insulated glazing units.
Quite.
So,
IF they'd said something to the effect that;
'radiators were/are traditionally placed under windows because (insert relevant reasons here)'
and then measured low/high level draughts and/or air temperature distribution at representative points in the room for single/ double/ triple glazing,
and /or for various outside temperatures,
and/or for various ratios of glazing or outside wall heat loss/total heat loss,
then their study might have been worth reading.
They didn't and the study does
NOT 'support your opinions.
You really were clutching at straws in quoting a study from a Teheran university.
My impression is that the valid logic behind the radiator placement has gone right over their heads.
The reasons for placing the rads under windows is not efficiency, it is more to do with comfort.
I'm fairly certain that someone has been through this with CFD and the answers are out there.