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Message started by justin_o_guy2 on 07/19/20 at 22:20:35

Title: Ancient Desert Refrigeration technology
Post by justin_o_guy2 on 07/19/20 at 22:20:35

https://www.ancient-origins.net/artifacts-ancient-technology/ancient-advanced-technology-2400-year-old-yakhchals-kept-ice-desert-021700

https://www.ancient-origins.net/artifacts-ancient-technology/ancient-advanced-technology-2400-year-old-yakhchals-kept-ice-desert-021700

I don't understand it yet, I just found it, and I like interesting stuff,,
Any engineers who can say this makes sense or not, I'd like to hear what you think.

Title: Re: Ancient Desert Refrigeration technology
Post by verslagen1 on 07/20/20 at 07:36:30

Possible, although I think they may have the diagram wrong.

The temperature underground 10' underground is quite cool.
So having a underground channel with air flowing thru it will be a little warm for a refrig, but if a vacuum were created that would lower the chill factor to freezing.

What I have doubts of is the wind tower. I don't think they would be channeling hot air into the basement at all. But wind blowing across an opening would create a vacuum.

Take a clear straw in a drink and blow across the top. Watch it draw up the liquid. That is the affect we're after.

Modern swamp coolers use this affect, so the drier the air the better which is usually found in the desert.

Title: Re: Ancient Desert Refrigeration technology
Post by verslagen1 on 07/20/20 at 07:55:47

Hmmm...
Let's say you took a 55 gal drum and filled it with water leaving an air gap at the top.
Connect a pipe and blow air across it, how cold will the water get?
Better yet, a mini version of those turbo ventilators.
Then turbo charge it with a horizontal wind mill.
Oh yeah!

Title: Re: Ancient Desert Refrigeration technology
Post by justin_o_guy2 on 07/20/20 at 09:00:41

Like a wash down gun.
The air across create a vacuum..
And according to Boyle
Pressure and volume blah blah blah Temperature..
Halve the pressure
Halve the temperature.
So, a place with low humidity and plenty of wind..
I lived in West Texas a while.
Swamp coolers were common. Not quite like a good AC unit, but good enough to sleep comfortably.

Title: Re: Ancient Desert Refrigeration technology
Post by verslagen1 on 07/20/20 at 09:23:08

By George, I think he's got it. 8-)

Title: Re: Ancient Desert Refrigeration technology
Post by Dave on 07/20/20 at 13:42:58

How cool does this area get at night? It may be that the night temperatures are at (or below freezing) in the areas where these things could make ice.

Title: Re: Ancient Desert Refrigeration technology
Post by justin_o_guy2 on 07/20/20 at 15:27:12

Dammifino,, Ive sure heard about places where its deadly hot in the day and way too cold at nite,,

Title: Re: Ancient Desert Refrigeration technology
Post by verslagen1 on 07/20/20 at 16:13:48

Typical design of a mexican rancho was to have tile floors with doors and windows that allows the wind to blow thru at nite. They would mop the floor and would allow the wind to chill the floor and it would stay cool all day.

Title: Re: Ancient Desert Refrigeration technology
Post by srinath on 07/20/20 at 16:55:01

All of this uses the massive massive thermal capacity of water. We in India used to have earthen pots sitting on sand with water in it, it would lose 1/2 its contents every hour to evaporation alone, and would keep water at near about 50 degrees under ambient. Except, the hotter it was the larger the differential was, if it was 70F, you'd have water at 65. But if it was 100, you'd have water near 50F.
People would also put various herbs in the water, Vettiver, tulsi, rose, saunf, Hibiscus, pepper (yea black pepper, and trust me, it does not do what you think it would) etc. Each friends house you drank water from was a different taste and different temperature LOL.

Cool.
Srinath.

Title: Re: Ancient Desert Refrigeration technology
Post by LANCER on 07/21/20 at 09:25:16

Hot dry air encourages evaporation and that takes energy, and when energy is removed from a mass that mass is cooled, whether solid or liquid or gas.

If you go underground the temp stabilizes at about 55-60 deg. You need long sleeves when going into places like Carlsbad Caverns, and can get a bit of a cooling effect by speeding up air over a surface.