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What would be a better medium for "cooler cells"? Answered

Talking about making cold packs by reusing plastic bottles. They'd be used in a portable cooler (stacked between spacers for airflow).

The obvious option would be just water, but I was thinking something a bit more creative.

Possibly:

~water and salt
~water and alcohol
~water and antifreeze
~just antifreeze

~polypropylene glycol
~https://www.instructables.com/id/How-to-make-a-%2420-ice-pack-for-%242/?ALLSTEPS


(The bottles would likely need to be epoxied shut to prevent leaking. Their life would also matter, can't have stuff growing in them after a few uses.)


Which do you think would stay cooler the longest?

Comments

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explosivemaker
explosivemaker

8 years ago

Using calcium would pretty much be the same thing?

Not necessarily making it colder, but preventing it from freezing.

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Vyger
Vyger

8 years ago

They are all going to have pretty much the same mass and as such have the same thermal storage capacity. Adding antifreeze will not change the amount of thermal energy, it will only change the temperature at which the water changes state. While water is changing state it will keep the same temperature until it is all frozen, then it will drop in overall temperature to whatever temp its environment is. The point of the additives is to alter the freezing point of water. They will not alter the amount of thermal energy is in the water.

I use plastic bottles for ice all the time. I wash out used drink bottles, fill them with tap water and put them in the freezer. Then just put a couple of them in the cooler and they keep everything cool for a long time. If it is a hotter day add an extra bottle. I have never had any leak but they do get wet from condensation and there is not much you can do about that. If its going to be a long day I sometimes freeze the unopened drink bottles and use them for ice also. Just don't ever use pop bottles. The CO in them gets released when they freeze and you get a fountain when you release the pressure. But things like tea and juice freeze great and stay cold for a long time.

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explosivemaker
explosivemaker

Answer 8 years ago

Again...I don't want to consume the bottles. They are purely for cooling the air passing through the "air conditioner".

I would think surface area would matter most, although to do so the packs would need to be smaller and wouldn't last as long.

A freezable fractal cube would be awesome.

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rickharris
rickharris

8 years ago

Antifreeze freezes around -15 to -25 depending on the type, strength so your going to have to get it COLD to freez.

Actual ice bulk is more effective than depth of freezing. So bigger bottles of frozen water will stay frozen longer than small bottles of colder antifreeze.

I tend to freeze water in soda bottles so it can be drunk as it thaws that way your not taking up room with something you can't eat or drink.

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explosivemaker
explosivemaker

Answer 8 years ago

I wouldn't plan on drinking the water, and I'd prefer units that would stay sealed.
It would be used inside where getting another "cold beverage" wouldn't be a problem.

2L bottles would "work" but they're very bulky.