Especially our bodies' own cooling, with sweat being ~30°c initially due to our body temperature?
Most alarmists are not entirely objective; their minds shy away from negative climate accelerations. Any feeling that there are physics equivalents of Earth 'forgiving climate sin' annoys them, and they brush such thoughts away.
This includes many alarmist scientists .. to some degree. They know & admit extra warming causes extra cooling and model it. Rightly or wrongly, as a group downplay them.
There are quite a few negative accelerations. The one skeptics have looked at most is moisture's role. Earth has been so habitable for billions of years partly because of the H2O molecule, which performs some climate stabilization role of some amount.
This is probably why alarmist scientists who are not drought experts go blank (their brains just down) whenever the topic of droughts comes up. They know perfectly well warming will not decrease global moisture and they also know their normie allies feel it does. Alarmists need that feeling (of future hot & dry) because extra warming with the same amount of moisture --> evaporative surface cooling.
At the bottom I put a few past such work. The latest is from Andy May. I link to it here as it may deserve the pub.
>Adding an extra 3.7 W/m2 only increases the initial surface temperature one degree Celsius/K, ... What would happen with surface cooling when surface temperatures rise by that one degree Celsius? ... Evaporative cooling (responsible for 78 W/m2 of surface cooling) would speed up by some 7% (Clausius-Clapeyron) Convection would speed up to a large degree because of both the higher surface temperature and the higher content of water vapor (+7%) in the warmest and most humid air columns ... As result of higher convection, more tropical clouds will form over larger surface areas and earlier in the day and more sunlight will be reflected to space before it can reach and warm the surface, thus solar absorption diminishes.
past work at quantifying, in no particular order. These authors were trained in climatology, unlike May, whatever difference that might make
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Eschenbach Tropical Evaporative Cooling
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Clive Best (only a mild skeptic) Evidence for Negative Water Feedback 'a water feedback value of -1.5 +/- 0.8 W/m2K-1 can be derived'
Experimental study of thermoelectric assisted indirect evaporative cooling system Evaporative cooling is being used widely to improve the indoor conditions due to its energ.
I live near Phoenix so I think using evaporative cooling in a mining shed would save on cooling costs. Let me know if you've had any luck using evaporative cooling. Thanks
This summer seems to be reaching record high temperatures! Take care of your pets!
Vet med student
Hi, Grow space is in garage. 12x10 room. This summer it’s been very hot and I have a duct fan, oscillating fan and a humidifier. I even keep the room open during the day.
What are thoughts on evaporative coolers and can anyone recommend upright models?
Does anyone have experience or knowledge of evaporative cooling systems in Central Oregon? I understand it uses less energy than compressive refrigeration...yes, perhaps uses more water but on the plus side increases humidity during hot dry summers. I've read that the Facebook Prineville CENTER uses big air, evaporative, and humidity flow systems. But does anyone use personal home evaporative systems?
Like the title says, I'm going to make/hang damp sheets for evaporative cooling.
My partner has a Chill-its cooling towel that is made from PVA - polyvinyl alcohol - fabric. Ideally I'd make these sheets out of PVA, or another fabric like it.
I guess the thing that makes it work so well is that it's very absorbent and porous? I was trying to figure that out:
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the material is hard and hydrophobic when it's not wet, but very absorbent once it is
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you can ring it out and it doesn't drip
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it takes a relatively long time to dry out, but it also works on the principal of evaporation so it must (I assume?) be very porous to facilitate that
Anyone have suggestions of where I could find this type of fabric, or can think of a similar material that would serve the same purpose? I want to make big sheets, at least 4'x6' and would like to keep the cost down as much as possible. I've thought about buying a bunch of PVA towels and sewing them together which I could do as a last resort.
Edited to add, has anyone done something similar with a type of cotton or linen fabric? I've been using old cotton and bamboo sheets and I can't ring it out enough so that it doesn't drip once I hang it.
Evaporative cooling is commonly used in dry hot regions where water evaporation results in temperature decrease (what is welcomed) and humidity increase (what is tolerable to some extent). In hot humid regions it either does not work or does not improve one's comfort due to high relative humidity.
There is an idea to create two-stage evaporative cooler:
- In first stage, highly concentrated salt solution is sprayed to hot wet air. Salt water droplets are hygroscopic so they absorb moisture from the air, resulting in hot dry air.
- Second stage is similar to common evaporative cooler – fresh water is sprayed to hot dry air coming from the first stage, it evaporates and results in cold air with acceptable humidity.
One can observe water gain in first stage and water loss in second stage – water "travels" backwards and the device looses performance. This can be solved by
- Adding freshwater to the second stage, partially disposing the diluted solution from the first stage and adding salt to increase concentration again;
- Adding freshwater to the second stage and concentrating the diluted solution in the first stage e. g. by solar evaporation in salt works;
- Closed-loop desalination of diluted solution from the first stage, returning resulting freshwater to the second stage and concentrated brine to the first stage, e. g. by solar distillation;
Except the pumps and fans, the whole cycle can be solar-powered: more sunshine ~ more cooling demand ~ more cooling ability.
I have found only this article regarding the topic: https://pubs.rsc.org/en/content/articlehtml/2012/ra/c2ra21414h
Do you have more info, e. g. about some working prototype / proof-of-concept installation? Any thoughts about parameters (achievable temperature drop, space requirements for unit of cooling power...)?
I'm lost to what kind of cooling to buy for the house. Managed to get a portable refrigerative aircon off gumtree which has been a life saver during these past hot couple weeks. I'm considering between buying evaporative ducted cooling VS split system. The evaporative cooling is around 4K, split system around 5.7K and ducted refrigerative cooling is 10K.
I'm leaning towards evap cooling but not too sure how well this works in Perth's weather particularly when it hits the 30-40 deg mark.
Looking to see what's working for others around Perth, how maintenance works in the long run, or if anyone has recommendations.
TIA
cooling? On another thread told me that evaporative cooling in green house doesn't really work, is this true? What are some over my options on cooling my green house in the heat summer
