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Author Topic: Solar cooling with 2 clay pots ! Very cheap genius idea !  (Read 81106 times)

Offline ResinRat2

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #45 on: March 30, 2009, 04:01:56 PM »
I thought we don't do mouth to mouth anymore? Only chest compression? AHHHHH now I see why they changed the procedure for CPR. It's because of GLOBAL WARMING!!! LOL!

Carbon dioxide and greenhouse gasses aside, I have been running the flowerpot unit in my basement with the aluminum oxide in the middle pot. I am going to let it run for a week or so before I buy the stirling engine. I can't run it outdoors yet because we have snow on the ground and cold conditions.

The aluminum oxide is in powder form and I purchased five pounds, but that was only enough to halfway fill the center pot. It will have to do for the experiment. I will add water to the unit once per day and I will report numbers and observations in about a week.

Thanks for your interest everyone.

Dave (RR2)
« Last Edit: March 30, 2009, 04:41:11 PM by ResinRat2 »

Offline hansvonlieven

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #46 on: March 30, 2009, 09:10:27 PM »
The best way to generate carbon dioxide is to put some sugar water in a flask and add some yeast. Bingo, pure carbon dioxide in minutes.

Hans von Lieven

Offline ResinRat2

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #47 on: March 30, 2009, 09:30:31 PM »
The best way to generate carbon dioxide is to put some sugar water in a flask and add some yeast. Bingo, pure carbon dioxide in minutes.

Hans von Lieven

Whoa, don't tell the Government. They'll have to put an extra Global-Warming Tax on every loaf of bread and every pastry product that uses yeast as one of its ingrediants.

Offline hansvonlieven

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #48 on: March 30, 2009, 09:35:57 PM »
Not to mention beer  ;D ;D ;D ;D

Hans

Offline Pirate88179

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #49 on: March 30, 2009, 11:59:02 PM »
@ Hans:

That is exactly what I was thinking.  I hope they don't read this.  They just raised my beer tax here $3.00 and they don't need any more ideas, ha ha.

Bill

Offline ResinRat2

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #50 on: March 31, 2009, 12:32:54 AM »
They are way ahead of you. LOL!

Offline Koen1

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #51 on: March 31, 2009, 01:39:39 PM »
LOL yeah well before you know it, they'll
implement legislation forcing breweries to
replace the CO2 bubbles with something like
Helium or something... ;D

Can we do it? YES WE CAN! lol ;)

Next thing you know, they're going to make us all
wear exhalation filters to filter the CO2 out of our breath...
;D

Offline hansvonlieven

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #52 on: March 31, 2009, 08:07:33 PM »
That will be fun Koen, we will all be talking like Donald Duck  ;D ;D ;D

Hans

Offline Koen1

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #53 on: April 01, 2009, 11:57:02 AM »
LOL well, Alvin and the Chipmunks probably sounds more heliumy
but yeah, could be fun! ;D

Ah, we'll see what "they" do eh...

It's great to have democracy, where the government does what the people want.
Every morning I am astonished to read in the newspaper what I want today.
It's amazing how many things I want that I never knew I wanted. Or even
thought I did not want. But hey, there's more of me that want it than that don't,
apparently.

LOL ;D

Offline triffid

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #54 on: April 02, 2009, 06:57:33 PM »
I guess one could make all kinds of money selling "carbon credits".Afterall everyone seems to be a potential customer.Triffid

Offline triffid

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #55 on: April 07, 2009, 06:43:36 PM »
I too have read about Donkey's solar icebox and am curious about that natural building material"cob",I would love to learn more about it.I also wonder how much heat those al oxide pellets can hold?
Anyone here have the answers?Triffid

Offline ResinRat2

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #56 on: April 07, 2009, 09:17:09 PM »
Well the solar pot experiment has been running eight days in my basement. I have been recording temperatures every 24 hours and adding water as needed to the sand. The center is half-filled with aluminum oxide powder.

Air temperature for my basement has varied from 66 down to 59 during the week and the temperature differential between the ambient air and the center pot has remained very steady at 3.9°F. So in my dark, reasonably temperature-controlled basement the unit maintains a sustained and almost four degree (°F) temperature difference. Not much, but it is consistent and not being driven by anything except evaporation alone.

I am anxious to get it outside in the sun where it can really rock, but we have had freezing temperatures and snow lately, so once there begins a warmer stretch of weather I will begin recording the numbers.

I am hoping to achieve a forty to fifty degree temperature differential in the hotter weather, strong enough to get a low temperature Stirling Engine going at a good and hearty clip, hopefully enough to power a small motor generator.

Thanks for your interest, RR2


Offline infringer

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #57 on: April 08, 2009, 02:19:19 AM »
ResinRat2 interesting results !

Glad to hear you are attempting this haven't seen you post as much as you used to.

Maybe I'm just not reading the threads your posting in could be but anyhow keep us posted on your progress ...

Do you have a digital camera if so mind taking some snapshots of your setup?

Offline ResinRat2

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #58 on: April 08, 2009, 03:17:10 AM »
The larger clay flower pot is 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 Aluminum Oxide Powder contents. Aluminum has a fantastic heat transfer rate so this should work well.

Right now I am keeping the top covered with plastic so all the cooling comes from the water that permeates the sides of the outer clay pot and evaporates. This is the cooling mechanism. The aluminum oxide center should resist temperature changes.

The goal is to set the unit in the sun so that the heat differential cools the center al. oxide below ambient and keeps a Stirling motor set on top of the al. oxide powder running. A motor that runs off the water evaporation. When the sun goes down the whole unit cools with the ambient temperatures, but the aluminum oxide should always cool at a different rate, thus again creating and maintaining the heat differential. My fingers are crossed that I can develop a unit that runs the motor continuously both night and day.

This unit is small, but larger units should have greater potential for developing and maintaining a heat differential that should be able to power larger Stirling Engines. That is what I am hoping for.



Offline infringer

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Re: Solar cooling with 2 clay pots ! Very cheap genius idea !
« Reply #59 on: April 08, 2009, 05:22:21 AM »
Too sweet finally a good sterling approach ! We hope ;)

Thanks bud!