I wonder how well that water spray in the image works at 40°C+ it would up the hygrometry to deadly levels while slightly cooling people off?
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It doesn't matter. Whether you sweat mostly water and it evaporates or water is evaporated to cool down the air around you, it is functionally the same in terms of the possibility of removing heat from your body. However taking external water has the benefit of not requiring your own water, helping you to dry out slower.
Lets take the 40°C 30% humidity example. If you go down vertically you end up with saturation at around 19°C. That is still quite fresh. If you take the 50% humidity at 40°C it will saturate at 27°C. Not nice, but still bearable. Anything in between on the vertical lines, so with the amount of water in that air being constant will just result in the same. The cooler it is the more humid it is, but the less humid it is, the better your own sweating can cool you.
I wonder if spraying water mist continuously will only bring a classic 20-30% @40°C up to 50%... But if it does, good luck, I was talking about this:
I think you don't understand the thermodynamics well. The evaporating water cools the air. That is the entire purpose. The air gets more wet, but at the same time it gets colder.
Assuming a stationary system state, you have a constant airflow of hot dry air going into the system and a constant airflow of colder more wet air leaving the system. Depending on how fast the one flows in and the other flows out, you will reach a certain point along the vertical absolute water concentration axis, which will define how wet and how cold the air inside the system is. But the more wet the air is, the more cold it also is.
I think you wrongly assume that this spraying happens in a system like a closed greenhouse or a sauna, where the wet air doesn't escape while the heat keeps coming in. But that is not what is happening with these sprayers at all. The wet air escapes easily. Even if there is no airflow by itself the colder more wet air of course is heavier and sinks to the ground, so an air flow is created.
Well you seems to assume lots of theoretical things too! Like all vapour just expanding away. It probably lingers, lots of water on the floor just oozing wet air.
I sure don't know, but I do get that feeling it's not really that good when the temperature is very high. Especially between lots of buildings and no wind.
A slight breeze, and an open space like some large Plaza and the dynamics are very different obviously, but I was chasing the worst case, as if bad, it'd be quite dangerous.
I sure don’t know, but I do get that feeling it’s not really that good when the temperature is very high.
You have feelings instead of knowledge. I gave specific thermodynamic explanations.
If you have worked with thermodynamics you'd know you need simulations to get even close to how things work in real world situations. Basic theory just isn't enough.
Well if its evaporating its cooling the area off a little too?
That's the thing, it's correct, but it also makes the air more humid, which in turn makes the human body less capable of sweating. At 100% humidity, 30°C is deadly, at 20% you'd sweat off 40°C no problem.
but the air does cool down with the mist. so that 100% humidity air is cooler than the normal air.
Only temporarily, but the humidity will be there for a while IMO.
Good point, but I don't think they put it there because of its function.
You can get a small window AC unit for like $200. I moved to a super hot humid area at 21, first thing I did despite working minimum wage was I bought a cheap window AC. Because I wanted to live. It only cooled my bedroom but I basically lived in that room for the next couple of months.
How the hell can that many people in Europe die when life saving cooling is so easily accessible? I know I hear Europeans say, "Not many houses have AC." Okay. But maybe consider it if you're dying? Seriously wtf.
Especially in the rich (so more northern) European countries they have some irrational fear of ACs, so if you don’t own the building (yes, not your apartment, the actual building) it’s often gonna be impossible to get an AC.
They have different windows than in the US too where you can’t install a window unit easily. It’s super fucked. I’m from a very warm place and life there wouldn’t work without ACs I don’t know how the fuck people did it 100 years ago, but living in Europe it’s weird how backwards people can be.
Window AC units are not common outside of North America
Lets make the number go higher! More coal! Lets go!! /s
It's too late to change things now - full steam ahead!
Tell this to India, in Europe the coal usage keeps dropping each year. They are on the very same planet as Europe is