acoustic fridge, very eco frendly

[Ptxèrra]

found this:

Spoiler

http://www.abc.net.au/science/news/stories/s741401.htm

i dont know the cost of it but it might be lower to produce than the poisonous fridges we have now
only the electric bill would be high.

[Technowraith]

Nice bit of technology.

[Toruk Makto]

That is VERY cool.  Thanks!

[Rangtsulfätu]

I don't get it. How do they get the heat out of the fridge? And how can this be less damaging than a conventional fridge? Conventional fridges have a closed gas circuit. So, unless there's a leak, the gas won't get out. And it they use air, the moisture in the air will freeze and block the tubes.

[Toruk Makto]

Tyehe standing wave resonant cavity is sealed, so moisture isn't a problem.

The CFCs in an old school refrigeration system WILL eventually get released to the atmosphere. It's just a matter of time.

[Rangtsulfätu]

Ok, I'm not a physicist, so I have no idea what you said.
I'm just an electrician who used to work for a company that builds industrial fridges and has picked up a few things there. So could you please explain?

[Kerame Pxel Nume]

Ok, I'm not a physicist, so I have no idea what you said.
I'm just an electrician who used to work for a company that builds industrial fridges and has picked up a few things there. So could you please explain?

What happens, in layman terms, is that ordinary air is turned into a refrigerant. A normal refrigerant has it's liquid vapor phase transition somewhere at the desired temperature and about atmospheric pressure. Pressurize it while it's warm and gaseous and it will go into liquid state, then cool it down, reduce the pressure, let it take heat and vapourize again.

Now about the same can be done with air, only you need much more pressure to bring it near the liquid state at room temperature. That's where acoustic waves come into play. Sound is waves of pressure in the air, make it loud enough and confine it into a resonator one can get huge amounts of pressure, large enough to get to a phase transistion. And phase transistions are, what can transport heat. I think you can figure the rest.