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Author Topic: Solar cooling with 2 clay pots ! Very cheap genius idea !  (Read 46709 times)

Offline hartiberlin

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Offline Creativity

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #1 on: April 29, 2008, 02:02:27 PM »
hmm i am surprised thet they haven't used it already there :o this invention is at least a few hundred years old,in greece and roman empire they used it a lot.I remember constructing one of those for myself from a pot for flowers,when inspired by history classes book (i was mybe 12 years old that time )  :)
So at least it is wel tested ;) i hope they will use it!

Offline ResinRat2

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #2 on: April 30, 2008, 04:21:12 AM »
What's interesting here is that we have a sustained and confined heat differential.  
How do you turn a heat differential into an energy generator? Personally I don't know how to do that, but maybe someone has an idea.

Let's brainstorm everyone. Throw out some ideas if you have any.

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #2 on: April 30, 2008, 04:21:12 AM »
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Offline ResinRat2

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #3 on: May 01, 2008, 06:42:03 PM »
Just a silly idea, running a pipe filled with liquid through a large apparatus, the cooling would cause the liquid to flow downward,  heat on the outside would cause the liquid to warm and rise, producing a liquid flow that might move a water wheel (fan?). The sun would power the whole unit by evaporating the water from the pots.

Just an idea, even though the sketch it very crude, I think you get the gist of it.

Thanks for your interest.

Offline wile_coyote7

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #4 on: May 01, 2008, 10:05:30 PM »
ResinRat2:

Why not simply have a matrix of pipes painted pitch black (or covered with tar paper or something to absorb heat), joined to another matrix, either buried in the ground or at least in the shade. Fill that with whatever fluid. Plop a turbine in the middle. You gotta heat-diff turbine. Hook the turbine to a generator........
Hmm....what if there was no sun out? Then maybe the option to bury the cooler side in the ground would be better. As long as there was a difference in temp between either side, there will be a movement of the fluid.

 8)


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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #4 on: May 01, 2008, 10:05:30 PM »
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Offline laci

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #5 on: May 04, 2008, 12:02:13 AM »
What's interesting here is that we have a sustained and confined heat differential.  
How do you turn a heat differential into an energy generator? Personally I don't know how to do that, but maybe someone has an idea.

Let's brainstorm everyone. Throw out some ideas if you have any.
[/quote

Hi ResinRat2,

  Try to get the solar cooling out of your head, but I have a working idea as to how you turn a heat differential into an energy generator>
  Heard about the Seebeck effect? There you get DC from a very simple model of heat differential.
  19th century discovery, college level physics.

  Regards,

    laci

Offline ResinRat2

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #6 on: May 04, 2008, 02:22:28 AM »
Quote from laci:

"Hi ResinRat2,

  Try to get the solar cooling out of your head,"

Actually, I am obsessed with this notion. Many people here are searching for the elusive "zero-point" energy, but I believe we need to focus our attention on the SUN. It runs this planet and drops kilowatts of energy per square meter on the earth's surface each day. I believe even Linnard Griffin's Electrolysis Process uses its endothermic nature to take advantage of the sun's heat. So I am inclined to be drawn toward exploiting the sun's naturally available power to run the world on. Anything that produces a temperature difference can be used to produce power.

Thanks for the Seebeck idea. It looks interesting and could easily apply to this "solar cooler"

I was just throwing out ideas, not necessarily something that I would pursue, just something that looked simple and easy to experiment with. Heck, I even went out and bought two clay flower pots, one that fits inside the other, and some sand to see if I can duplicate this temperature differential and take some measurements just for fun. I am still working on my hydrogen reactor, but this is just something quick and dirty that I could look at. I guess I just like to research stuff; even in my spare time. I guess you can see that I'm not a "party" type of guy. LOL!

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #6 on: May 04, 2008, 02:22:28 AM »
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Offline Koen1

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #7 on: May 06, 2008, 01:00:18 PM »
Although I don't really follow how exactly a simple two pot setup is used
to provide cooling from sunlight (couldn't run the .mov for some reason),
it seems to me that a sustained temperature difference should allow
for the use of a simple thermocouple to produce electrical output?
Depends on the temperature difference, of course... ;)

Offline ResinRat2

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #8 on: May 06, 2008, 02:24:23 PM »
Hi Koen1,

The simple process involved is merely cooling by water evaporation. The center pot is cooled by the water evaporating from the sand around it. Apparently it is cool enough to preserve vegetables for three weeks that normally spoil in three days. So it must be in the very low 50 or mid 40 degrees F; and it looks like this is in a very hot region of the earth. So we could probably guess a 25-35 degree difference in temperature at least. Probably even more on a hot day.

Based off your noted Seebeck effect, I wonder what kind of current is possible from this temperature differential?

This is just an idea, something I probably wouldn't be pursuing at this moment in time; but maybe possibly later on. I still need to do my experiment with the clay pots just for fun. I am curious what kind of temperature difference I could see.

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #8 on: May 06, 2008, 02:24:23 PM »
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Offline jeanna

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #9 on: May 07, 2008, 02:32:28 AM »
ResinRat2,

I was inspired by your interest in this 2 clay pots thread to post the item on Donkey's solar refridgerator.

In that system, the stovepipe is painted black and powerfully draws the air into the lower part of the system, and across the water evaporator which is the burlap bag. This cools the air inside the walk-in cooler. In fact there is even a draft controller to slow down the breeze to keep things from freezing.

But in addition to this cooling, The moist breeze is drawn across the aluminum cans that are sticking out of the entire inside wall of the walk-in cooler.

I am not sure what it is called, but cold moist aluminum boosts the cooling process.

The proximity of the cold cans and the hot stovepipe would make it easy to rig up a thermocouple, I should think.

I just thought I would draw your attention to the design, in case you missed it.

thank you,

jeanna

Offline ResinRat2

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #10 on: May 09, 2008, 12:49:07 AM »
Well, here is my attempt at a simulation of the two-pot cooler.

The larger clay flower pot it 11 inches across and tall, the smaller clay pot is 9 inches across and tall. The space between them was filled with fine playbox sand. I covered the bottom holes with plastic, but the inside pot water bubbles into the pot so I placed a layer of aluminum foil on the inside to protect the contents. Aluminum has a fantastic heat transfer rate so this should work well.

The first thing I noticed was that the water soaked from the inside to the outside surface of the clay pot, so this is how this unit is working. The water evaporates from the outside large surface area of the outer clay pot and evaporates, drawing heat from the center inside pot. I covered the top with a shami type rag that I soaked with water. I want to see what type of temperature differential I can cool the soda-pop cans down to after a day or so. Also, I am keeping the unit in my basement so I can maintain a somewhat controlled temperature and humidity environment.

I will keep you all periodically posted on what I find.

Thanks for your interest.

P.S. Now I am going to work on my hydrogen reactor. Wish me luck.

Thanks for your interest

« Last Edit: May 09, 2008, 01:51:49 AM by ResinRat2 »

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #10 on: May 09, 2008, 12:49:07 AM »
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Offline hansvonlieven

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #11 on: May 09, 2008, 02:15:22 AM »
G'day all,

I don't know why everyone gets so excited about this. Evaporative cooling has been used since antiquity. Unglazed pottery has been used from Babylonian times to cool liquids, so have goatskin bladders. In Australia the technology is used in the outback. The typical "bush fridge" is no more than a wire cage with a cloth wrapped around it that trails in a container of water. When outside temperatures are beastly hot (It can get to 55 degrees centigrade in some places) we hang a bed-sheet over the windows inside, like a curtain, and put the bottom end into a bucket of water. It works a treat.

Am I missing something here?

Hans von Lieven

Offline BEP

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #12 on: May 09, 2008, 02:44:37 AM »
I wonder how well this would run a Sterling Stirling engine.

After all, I had one made from a tuna tin that ran from the heat off the palm of my hand. All it needs in a differential. Sounds like there is differential with this.

If interested there are plenty of web sites for this engine.
« Last Edit: May 09, 2008, 03:08:21 AM by BEP »

Offline ResinRat2

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #13 on: May 09, 2008, 02:51:03 AM »
Hi Hans,

The purpose of this experiment is to determine the actual heat differential that can be achieved. Then see if the localized heat sink can be used with the Seebeck effect to produce an electrical current from the heat differential.

It's just an investigation into converting evaporation of the water directly into a constant electrical current, that's all. This is the first time I have heard of this effect, so please don't be too hard on my ignorance on this subject.

I just found it interesting. Thanks.


Offline hansvonlieven

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #14 on: May 09, 2008, 03:19:50 AM »
Sorry Dave,

I didn't mean it like this. I was just surprised that evaporative cooling was such a new area for so many. You can get much bigger effects if you use liquids other than water, like alcohol, ammonia or ether. Ammonia was used in absorber fridges and in ice production in the old gas works that used the waste heat to produce ice. Fascinating technology.

Hans

 

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