Dry Ice in a FigJam?

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uncle sticky
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Dry Ice in a FigJam?

Post by uncle sticky » Wed Jul 25, 2018 3:34 pm

I've seen people pack ice into swamp coolers. Wondering if packing in some dry ice would work. Issue I see are not letting the dry ice contact the water directly (thick plastic bags to prevent contact?), and blowing Co2 into an enclosed space as the dry ice evaporated.
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Re: Dry Ice in a FigJam?

Post by motskyroonmatick » Wed Jul 25, 2018 3:38 pm

I think that would be very dangerous and could result in death.
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Re: Dry Ice in a FigJam?

Post by LowePro » Wed Jul 25, 2018 5:02 pm

Let's not. Dry ice has to offgas and some CO2 will escape even if it's wrapped in plastic. Otherwise the plastic wrap will swell until it bursts. The bucket cooler would suck CO2 gas and inject it into someone's tent or structure where they are likely sleeping. The nap would start off great, but could end poorly.

What's the goal? To cool off the water and make the swamp cooler put out even colder air? You could try it with regular cubed ice or one of those frozen Gel-pack ice thingies--throw that in the swampie and see if it brings the air temp down.

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Re: Dry Ice in a FigJam?

Post by Token » Wed Jul 25, 2018 5:09 pm

An alternative would be to drop a couple few high-power high-frequency vapor transducers into the cool water of the bucket cooler.

Btw, nothing wrong with “risk of death” results at BM.

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Re: Dry Ice in a FigJam?

Post by some seeing eye » Wed Jul 25, 2018 5:11 pm

Dry ice is about $4/kg. Each kg gives up about 500 kiloJoules when it evaporates (enthalpy of sublimation). Water is about 1kg per quart. A quart of water is ? say <$.25. That quart of water gives off over 2000 kiloJoules when it evaporates in a swamp cooler (enthalpy of vaporization). A Figjam cooler uses about 1.6 quarts per hour. That's about 2000 BTU/h. Cooling the water doesn't improve that number much.

So dry ice costs about 64x more to produce the same result, not counting transport losses.

Check my math, safety not guaranteed.
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Re: Dry Ice in a FigJam?

Post by Molotov » Wed Jul 25, 2018 6:55 pm

Dry ice in a plastic bucket cooler will probably end up with a shattered bucket, and there goes your cooling system.....but you won't notice, having already asphyxiated due to oxygen displacement by carbon dioxide gas.

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Re: Dry Ice in a FigJam?

Post by Lonesomebri » Wed Jul 25, 2018 8:35 pm

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Re: Dry Ice in a FigJam?

Post by TT120 » Wed Jul 25, 2018 8:58 pm

This is not a good idea, you would be pumping CO2 into your tent as the dry ice sublimates. CO2 is pretty deadly stuff. You'd fall asleep and never wake up.

Chilling the water in a swamp cooler does not produce any noticeably cooler air so you would just be wasting ice and/or causing death.
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Re: Dry Ice in a FigJam?

Post by Meat Hunter » Thu Jul 26, 2018 9:26 am

Evaporative Cooler + Dry Ice = Not a good idea.

This goes with driving Long distances with an ice chest with dry ice in the trunk (boot) of your vehicle.
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Re: Dry Ice in a FigJam?

Post by BBadger » Thu Jul 26, 2018 3:00 pm

At least the corpses would still be relatively cold for a while though.

The evap cooling actually works really well for tents short of actual AC. If it's not quite doing the job, upgrading the evap cooler would probably be a better bang for your buck than ultrasonic transducer pond misters or (water) ice in the bucket.

Even if the dry ice didn't kill you, for the amount you pay for just the ice you could probably get a nicer fan or pump.
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Re: Dry Ice in a FigJam?

Post by Token » Thu Jul 26, 2018 4:21 pm

I absolutely hate having to repeat myself ...

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