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Old 26-07-2019, 10:36 PM
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Turn your esky into a super esky

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Old 26-07-2019, 10:48 PM
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If you can be stuffed watching it - putting your cheap esky in a big box and surrounding it with explanding foam doubles the life of your ice.

Last edited by yellow door 1; 27-07-2019 at 01:12 AM.
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Old 26-07-2019, 11:10 PM
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Also bought myself an infrared thermometer - so I can finally check if salt water ice lasts longer and if its colder.

about 3.5 percent of the weight of seawater comes from the dissolved salts. - but I'm going to try a bit saltier
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Last edited by yellow door 1; 26-07-2019 at 11:13 PM.
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Old 26-07-2019, 11:29 PM
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Pro tip - if you are trying to mix pool salt into water - dont just pour it into a bottle and shake - it was taking ages to dissolve.
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Old 26-07-2019, 11:30 PM
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and so it begins..........

p.s. yes I did notice the water levels were uneven - this has been corrected
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Last edited by yellow door 1; 26-07-2019 at 11:34 PM.
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Old 27-07-2019, 01:07 AM
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Well its been 90mins and the saltwater is cooling down quicker

Last edited by yellow door 1; 28-07-2019 at 03:09 AM.
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Old 27-07-2019, 01:36 AM
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Ok its official - salt water gets colder quicker and doesnt freeze solid as quickly as fresh.

Salts at -4 and not frozen at all
Fresh is just under zero and has started to crust up
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Old 27-07-2019, 03:19 AM
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Energy transfer depends on mass.

Salt will change the freezing temperature of the ice but the same mass of saltwater will contain the same thermal energy as normal water.
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Old 27-07-2019, 03:20 AM
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Ok theres some very strange voodoo going on here.

After 3.5 hours - heres whats happening

The Freezers back wall reads -18

the salt water solution is down to -9 - (still liquid)

but the fresh water has stalled right at Zero degrees.

If I was guessing I'd say the ice, that has formed in the fresh water bottle, is creating an insulating wall and is keeping the temp steady

Last edited by yellow door 1; 28-07-2019 at 03:09 AM.
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Old 27-07-2019, 03:53 AM
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Quote:
Originally Posted by Kelvin View Post
Energy transfer depends on mass.

Salt will change the freezing temperature of the ice but the same mass of saltwater will contain the same thermal energy as normal water.
Yeah my mind is still spinning from the thermometer results - so I'm having a little trouble getting my head around the thermal energy concept.

Is it - each kilogram of ice has a certain amount of "cool" - it can either be released quick and keep things very cold - or slowly and keep things not so cold.

Or like they are 2 balloons full of air - both have the same amount of air - its just how its released

Do you think there is any benefit using saltwater ice over fresh water ice to cool things down?

Last edited by yellow door 1; 27-07-2019 at 05:08 AM.
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Old 27-07-2019, 04:09 AM
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Ahh this vid touches on thermal energy with 15lb portions of ice.

The dry ice is cold enough to freeze a coke can and make it explode - but it only lasted a couple of days under simulated normal use - (opening and shutting, left out in the sun)

The scattered ice cubes from a bag lasted 3 days - but internal temps were no where near as cold as the dry ice

and the ice in water bottles lasted 3.5 days. - internal temps were about the same or a tad warmer than the scattered ice.

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Last edited by yellow door 1; 27-07-2019 at 04:30 AM.
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Old 27-07-2019, 04:34 AM
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Old 27-07-2019, 05:33 AM
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Last edited by yellow door 1; 28-07-2019 at 03:10 AM.
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  #14  
Old 27-07-2019, 06:51 AM
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The salt water ice will provide more cooling but only by a small amount and only because there is more mass for the same volume in saltwater compared to freshwater (saltwater is denser).

Currently you are only measuring the rate of temperature change and the fresh water is slowly becoming solid. Fresh water freezes at 0 degrees and thus it will continue to read 0 until the water is all frozen.
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Old 27-07-2019, 06:57 AM
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Here is an interesting question

Take 1kg of water in a plastic bottle, 1kg of saltwater in a plastic bottle.
Freeze them in a freezer to a temperature of -10 degrees and let them reach a steady state.

Put each of these into a separate bucket of water and wait till the temperature equalises. Assuming all other variables are equal which will be colder?

Last edited by Kelvin; 27-07-2019 at 07:16 AM.
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