Why the French are painting their windows with chalk to beat the heat
https://www.bbc.com/future/article/20260625-why-the-french-are-painting-chalk-on-their-windowsOpen linkView original on feddit.ukSyndicated from the fediverse. Read and engage on the original instance.
View original on feddit.ukhttps://www.bbc.com/future/article/20260625-why-the-french-are-painting-chalk-on-their-windowsOpen linkView original on feddit.uk
18 replies
Well ... The answer to the question is already in the headline
anti clickbait
Public media
shrugs in blackout curtains
However, with your curtains, the sun (and heat) has entered your home. When it is extreme heat, you want to stop it on the outside of your house to avoid heating up inside.
Good point, maybe even use both?
It will also help, if not anything else, they can insulate further.
In places, where they have been getting extreme heat for a long time, they often have shutters for their windows to block out the sun.
Just 86 "Why", so stupid.
To beat the heat - here you go
There exists by the way an ancient German word for that kind of washable paint, "Scheibenkleister". It has mutated to express what French say with "merde" or Americans with "oh shit". But the original meaning is a paint which could be used to write on shop windows or blackboards with a brush, to announce offers like menus for restaurants, or special items for small shops. My mother still used it for her shop in the seventies. Todday, it is still sometimes used to blind windows when shops are renovated, to indicate they are closed.
The big advantage of Scheibenkleister is that it is completely washable, it gets very easy off when wet!
Here is also a video by someone who measured which is the most effective placement for a desk fan to replace the air inside with cool air in the morning hours:
Best fan placement to move cool air through the house
What he found is it was best to place the fan 0.5 to 1 meter away from the window, and direct it to blow outside, not inside, and of course with another window open. (The reason is that due to the pressure differentials, part of the airflow is actually circulatory, similar to the magnetic flow in a coil with current, or aerodynamic flow at the tip of a wing - the fan causes the pressure to be higher in front of it, and at the edges air flows back from the high pressure zone to the low pressure zone at the back, causing a vortex).
Like the fake snow paint?
Can you explain which paint you mean?
Do you put it on the inside or outside? Seems like outside would be better because heat it radiates to the outside would go directly to the air, and heat it radiates to the inside would have to go through the glass first.
Yes outside is better. One can also buy transparent heat protection foils which can be glued to the window, and with these it is actually important to put them outside, otherwise the window can become too hot, and become damaged. (In the case of the white paint, physics is a bit different since more of the light is reflected directly, but outside is still better, as with all kinds of blinds.)
Limewash for exterior surfaces can help a lot
Yeah it is limewash, but not the caustic one, it is just calcium carbonate - the material that school teachers use on blackboards.
Very cool