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Peltier devices for "personal cooling" ? (or heating)

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cdev:
I've done that with small fans (and also tried ducting with the air) and it works far better than nothing. A small but strong fan that could be hooked over a neckline would definitely help and I think your analysis of the energy efficiency vs. peltier device is sound.

--- Quote from: NiHaoMike on August 01, 2020, 03:02:42 am ---Might as well use ice storage instead of batteries. With Peltiers, even the best design that operates the Peltiers in the most efficient region powered by cutting edge lithium batteries might barely break even in terms of cooling per weight if only the weight of the batteries is counted (probably way behind after adding the weight of the heatsinks). With a compressor, you might get up to 5x improvement but that's still not counting the weight of heat exchangers and the compressor itself which would again make it challenging to merely break even. Then you have to compete with the super low cost of water...

--- Quote from: coppercone2 on August 01, 2020, 12:22:29 am ---in america, we just take our shirts off.

--- End quote ---
Only on the beach, not in the city.

That said, minimalist clothing apparently is more acceptable in China.


That's one way to get a lot of airflow over a large surface area, a high tech alternative that would be more acceptable in many places would be to have a small server fan providing the airflow and the clothing acting as ducting. A fairly small pack of 18650s will easily power the fan for hours.

--- Quote from: cdev on August 01, 2020, 02:14:20 am ---If people stay there (and dont move somewhere else) it would take too much power to cool many buildings so people may have to carry their own cooling around with them.

--- End quote ---
Or HVAC systems use IR sensors to direct the heating and cooling to where it's really needed. That's already done in some high end mini split units, BTW.

--- End quote ---

In some specific beach and desert communities where rich people gather here in the US seeing people dressed like that (even wearning formal clothing, apart from the bikinis- they might also wear jewelry)  is normal.
It's straight out of a Fellini movie.

I bet they would go for expensive, but not very practical high tech cooling hardware.

Marco:
Last time I did some napkin maths, I concluded ice gives you over twice the cooling power per weight of batteries+peltier. You need a compressor to start being competitive with ice.

cdev:
My sweetie has gotten me in the habit of wearing wet stretch bandanas and wet scarves around my neck when its hot. It really does help a lot.

RenThraysk:
There are such things called neck cobbers, with polycrystals inside that absorb water and evaporative cooling cools the blood in the neck arteries.

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