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Old 08-31-2005, 01:41 AM   #1
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Dry Ice

Since dry ice is a sloidifyed form of CO2, would putting some in a DIY CO2 System would supply an adequate amount of CO2?
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Old 08-31-2005, 01:53 AM   #2
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I think your thinking in new territory here.. :P someone has to think these things up.. :P
it might be well not very conceivable.. how quickly will it melt? is CO2 the only product released by it?
at least your not running natural gas or propane burners through thought process..
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Old 08-31-2005, 02:32 AM   #3
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Its been done. Dry ice sublimates fairly quickly (releasing CO2 and nothing but), but usually at too quick of a rate to be particularly useful [you would have either very high output or a container under a lot of pressure (much more than most DIY flasks could handle) for at least shortish periods]...besides, it would be a pain (and a bit pricey) to be replacing the dry ice every few hours.
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Old 08-31-2005, 04:56 AM   #4
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so if you had a canister that could hold it.. such as a CO2 canister with assorted equipment it would just be cheaper and less of a hassle to get it filled?
Im curious how they produce the gas to fill your canister.. maybe thats another thread topic altogether..
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Old 08-31-2005, 08:56 AM   #5
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can't fill a co2 cylinder with solid CO2... CO2 is ONLY a solid when put under extreme pressure and cold.

And no, it would be more expensive. A 3lb block of dry ice costs $7.50 around here, and might last 12 hours.
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Old 08-31-2005, 02:30 PM   #6
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To reduce the sublimation rate to make dry ice feasible, you would have to refrigerate it. Thus, the pressurized system would be easier and cheaper. I like your "out of the box" thinking though.
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Old 08-31-2005, 03:53 PM   #7
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and also, if you have a deep tank put where the CO2 is released at the bottom so alot of the CO2 is absorbed before the bubble hits the surface *by the way, i'm new and learning alot about CO2 stuff and just correct me if i'm wrong*
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Old 08-31-2005, 05:19 PM   #8
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I thought of this because my yeast generator wasn't making alot of bubbles. So I thought adding dry ice would make my Reactor more efficient.
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Old 08-31-2005, 09:30 PM   #9
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Adding dry ice would kill your yeast culture because it would freeze the water if there was enough of it.
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Old 08-31-2005, 09:36 PM   #10
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we're not talking about putting in dry ice in the yeast culture, were talking about dry ice creating the c02.

also if you refrigerate you can control the rate it melts, thus a more controllable diy co2
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Old 08-31-2005, 11:38 PM   #11
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opps sorry, i forgot to mention taking out the yeast culture first
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Old 08-31-2005, 11:42 PM   #12
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azn_fishy55 said:
"I thought of this because my yeast generator wasn't making alot of bubbles. So I thought adding dry ice would make my Reactor more efficient"

It sounds like the original poster wanted to add it to their culture and I was referring to what would happen. I realise the rest of you were discussing using it separately. Refrigerating dry ice (or freezing it) won't work as it dissipates at temperatures above -100F and nothing made for food will even approach such temperatures.
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Old 09-01-2005, 12:31 AM   #13
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If it dissipates at -100F how do they keep it from dissapating at LGS?
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Old 09-01-2005, 08:33 AM   #14
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http://www.dryiceinfo.com/ is the source I used to obtain my statements. Most places that supply dry ice make it as well and if LGS is a gas supply they're making it from liquid CO2 thus no worries about dissipation just make more.
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Old 09-01-2005, 08:41 AM   #15
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cant dry ice burn u?
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Old 09-01-2005, 09:43 AM   #16
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dry ice gives you frost bite, which is a burning senstation...at least until all the nerve endings are destroyed.
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Old 09-01-2005, 11:24 AM   #17
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Quote:
Refrigerating dry ice (or freezing it) won't work as it dissipates at temperatures above -100F and nothing made for food will even approach such temperatures.
Correct in that it won't stop the sublimation. However dry ice does sublimate much slower in a freezer than in open air. Think about putting an ice cube in a cup of cold water as opposed to a cup of hot coffee, either way it melts, it's just a question of time. The real question becomes amount of co2 dissolved into the tank per dollar of fuel cost. At a guess I'd say you could probably get a 20 pound block of dry ice to last a week with some sealed coolers and a low pressure valve.

The down side is there's always going to be high co2 production when the dry ice is put in. You can't stock up on dry ice to replace the old stuff, you'd have to run out and buy more every week. Attempting to make it last longer by increasing the storage pressure can end up being very dangerous.

Now if you happened to have the equipment to MAKE the dry ice on demand...it might be worth thinking about.
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Old 09-01-2005, 11:35 AM   #18
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Dry Ice sublimation can be reduced, not prevented, by insulation and refridgeration. Put a chunk of it on your countertop and its gone pretty quick, stick it in your cooler and it keeps food cold for days. big advantage is that it sublimates (ie: goes from a solid to a gaseous state without an intervening liquid state) so that it can keep things cold and dry. I think it could be made to work. But the cost of a poorly insulated or poorly refridgerated dry ice system would be high due to the cost of lots of dry ice. The cost of a refridgeration system would be high also. Thus, pressurized systems, although expensive, are the most cost effective oncy your needs exceed DIY yeast systems.

Yes, you can get a freezer burn from dry ice. One definition of a burn would be a rapid exchange of thermal energy with your skin or other tissues. Thus a very hot or a very cold object can cause a rapid change of thermal energy. Freeze injury can be every bit as damaging as heat, but it usually takes more contact time with a cold object to cause injury than with a hot object, so cold objects are a little harder to get burned with.
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