Naked Science Forum
Non Life Sciences => Technology => Topic started by: scientizscht on 27/02/2021 18:04:44
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Hello
Is there a device to freeze my drink asap?
I drink cold beverages that are produced hot so it takes almost an hour to cool it properly!
For small budgets ideally.
Thanks
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Ice.
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Ice.
Or a small refrigerator or an ice-cream making machine. These can be obtained at modest prices. But they're still more expensive than devices that heat things up, such as microwave ovens. Or traditional electric or gas ovens.
Which leads me to wonder - why is it easier for us to make devices to heat things up, than cool them down.
This seems to run counter to conventional theory, that the Universe is expanding and getting cooler all the time. Eventually ending in a "heat death" of the Universe. Where everything is in a frozen-solid state.
What I mean is, if the overwhelming natural tendency of the Universe is to get colder, why is it easier for us to make hot ovens instead of cold refrigerators?
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Yes, it is almost always easier to heat something up than cool it down (and it's because of thermodynamics, and what we can do to accomplish each).
Essentially the only way to cool something down is to move its thermal heat elsewhere. The efficiency at which this can be done depends on the temperature of the thing that's getting cooled down, and the temperature of whatever is accepting the thermal energy. (It is spontaneous and really efficient if the object losing heat is much hotter than the heat sink, and the efficiency drops off as they get closer in temperature. Once the source of the thermal energy is colder than the sink, the process is non-spontaneous and requires input of energy (refrigeration). And in this regime, the larger the difference in temperature, the more applied energy is required to move the same amount of thermal energy "the wrong way".
When heating an object up, we can do it by heat transfer (and the same rules apply: it is easy to move heat from hot to cold, not the other way). Or we can transform non-thermal energy into thermal energy (it is much harder to go the other way). One can easily and rapidly generate arbitrarily large amounts of heat in arbitrarily small spaces by delivering electrical energy (think of a light bulb filament that goes from 300 K to 3000 K in the blink of an eye), or chemical energy (like a blowtorch or a combustion engine), or even light energy (concentrated laser light or sunlight can deliver millions of watts per square meter, and instantaneously turn any matter in the focus into a superheated plasma).
Unfortunately there really isn't any good way to have an object at any reasonable temperature cool down significantly by emitting intense light.
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try adding salt to normal fridge ice in Your portable box, like that You should achieve quicker and higher freezing point, tho not sure about the second premise ...
also Dry Ice will do the job, but not sure if there is home appliance for such technical gas, You can store it tho for a while in tight sealed styrofoam container (not in freeze) but still will evaporate if we know that its proper storage temp is -79 °C (-109 °F), but You must be careful around handling because dry ice can cause dangerous frost alike burns, so its better not to experiment with!
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A plate cooler
https://www.delaval.com/en-au/our-solutions/milking/cooling-storage--testing/plate-coolers/
Refrigeration coil
https://www.hawco.co.uk/en/refrigeration/evaporators/copper-aluminium-coils
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https://www.indiegogo.com/projects/juno-like-a-microwave-for-cooling#/
The way it works is you vertically drop the bottle into a bath full of cold water and spin the bottle backwards and forwards rapidly along its long axis. That sets up convection currents within the bottle that mixes the liquid well, particularly to the rim where the conductivity of the glass, and the thinner boundary layer that forms both inside and outside the bottle suck the heat away into the water bath at multiple times the normal speed.
Thing is, you can do the same thing, albeit not quite as fast, with a bucket of salt/ice and spin it to and fro with your hand.
Doing this, you can cool it way down in just a minute or two, with things you have on hand, but I've never tried to actually freeze things this way-as it starts to freeze the ice will tend to act as an insulator; but either way, the quicker you can get it to the freezing point, the better.
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Hello @scientizscht
🙋
A couple of things could be done collectively...helps Me!
👍
Chill the empty glass by placing it in the Refrigerator, it absorbs the heat of the drink pretty quick, but not all of it Obviously.
🥛
Use metal ice cubes...they stay cool for longer than regular ice cubes & also do Not end up dissolving extra water & diluting your drink.
⬜
Thee Best way is to simply keep a spare drink in the Refrigerator.
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Make your New hot drink n let it cool down to room temperature & shift it into the refrigerator to chill.
(1 hour process)
By that time, just remove the already previously placed spare drink n Njoy it.
(1 minute process)
P.S. - If you fail to Plan...you plan to Fail.
👍
Critical Thinking comes in handy.
CheerZ!
☃️
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yes, liquid nitrogen ;D
jokes aside, instant freezing will need incredibly fast heat transfer and consumption of a lot of energy
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yes, liquid nitrogen ;D
That is what I was going to suggest. You can make your teasicles almost instantly.
And it won't ice over like dry ice.
Perhaps a little practice in case hot tea plus cold N2 would cause explosive boiling.
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Yes, there is device Chill Bits.
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One can brew Ice Tea cold... it just takes more time.
I'm not sure the same goes for ice coffee (other than using an instant coffee).
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Use metal ice cubes...they stay cool for longer than regular ice cubes
I wouldn't bet on that.
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Hi B.C.!
😊
Soo...the Metal one could lose chill...or say absorb heat quicker than the regular Ice ones?
🤔
Or does it have to do with the difference in properties of the Actual Material?
Like a metal or steel surface vs the ice surface.
P.S. - Anyhow, CheerS!
🍺
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The heat capacity of metal is much, much smaller than the latent heat of fusion of water.
A 10 g steel "ice cube" at 0 °C can only absorb (0.466 J/g°C * 10 g * 20 °C =) 93.2 J of thermal energy before reaching 20 °C.
A 10 g ice "ice cube" at 0 °C will absorb >3300 J of thermal energy and direct that all to melting before any of it goes to increasing the temperature above 0 °C.
Sounds like a win to me. (plus no broken teeth!)
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So Ice cube has more Capacity to absorb Heat than a Steel cube, yes?
Also normal refrigeration won't super cool a Steel Cube more (vs) an Ice cube, Right?
@ chiralSPO
Agree with broken teeth risks...
Imagine being totally Drunked & swallowing one of it..
😒
Yeaa CheerZ!
🤭
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So Ice cube has more Capacity to absorb Heat than a Steel cube, yes?
Effectively, yes. Technically the "latent heat of fusion" isn't considered "heat capacity," but that's really a semantic thing. The water ice is able to "accept" more thermal energy than the steel.
Also normal refrigeration won't super cool a Steel Cube more (vs) an Ice cube, Right?
Correct. One could cool the steel to arbitrarily low temperatures with more specialized refrigeration (or cryogens), but you could do the same for ice, and get almost the same benefit.
Agree with broken teeth risks...
Imagine being totally Drunked & swallowing one of it..
😒
"well, actually, Doctor.... I may have swallowed it.... I don't remember, though..."