Einstein's fridge: cold without current

[Lietseu]

Researchers at the University of Oxford pulled out of their drawers an invention by Einstein: a refrigerator that does not require a power supply.
Malcolm McCulloch, electrical engineer at Oxford, is leading the 3-year research project. He has already made a first prototype from a patent filed in 1930 by Einstein and his Hungarian colleague Léo Szilard.

He explains to the Guardian that the invention is based on the property that a liquid boils at a lower temperature when the pressure is low.



On one side of the device is placed a flask of butane, the evaporator. "If you introduce a new vapor above the butane, the boiling temperature of the liquid decreases, and, when it evaporates, it captures the energy of its surroundings. This is what creates the cold." explains McCullach. This concept, which uses butane, ammonia and water, was partly exploited in the first models of refrigerators, but abandoned in the 1950s in favor of more efficient compressors. It is the switch to freon gas.

Here, the only energy required is heat for the pump. McCulloch is working on coupling this machine with solar power. He believes in any case to be able to quadruple the efficiency of the device by reviewing its design and replacing the type of gas used. (src: The Guardian)

My aunt Hortense had a very quiet fridge which worked with a natural gas pilot in the 60s / 70s, it was very good, no compressor noise, no need for electricity, would it be possible to transform an electric into butane ?

If so, I sign up for a lecture!
Operating the electric freezer with a gas bottle may soon become very interesting in the event of a mayhem following a stock market crash.

Greetings from Lietseu

[swift2540]

No Lietsieu,
transforming the fridge is not possible.
But there are fridges that work on gas, or multi-energy, gas 220V, 12V
Camping fridges for example
@+

[coucou789456]

Good evening

.........
Operating the electric freezer with a gas bottle may soon become very interesting in the event of a mayhem following a stock market crash.
Greetings from Lietseu

not sure, especially if the price of gas is indexed to the price of oil. which moreover comes partly from the east!

jeff

[Capt_Maloche]

Yeah !! they have just reinvented absorption systems, well known and used in the industry

https://www.econologie.com/le-froid-sola ... -3265.html
http://www.outilssolaires.com/premier/prin-clim.htm
http://www.neb.fr/absorpt.htm
etc ...


Personally, I prefer the magnetic water fridge http://www.nouvo.ch/116-3
https://www.econologie.com/forums/le-frigo-m ... t3876.html

[Nautilus]

I worked for a few months in a Swiss box that did just that with absortion fridges:

http://www.sibir.ch/691.176/produits/re ... sibir.html

It is a system used by the red cross for example in places where there is no current.

These fridge are quite expensive but it works.

greetings

[Bibiphoque]

Hello,
Childhood memory, relighting the night light of the gas refrigerator when returning from vacation .....
It was still the era of coal gas !!

@+

[carburologue]

sorry but I believe a liquid boils at a lower temperature when the pressure is high ...

[the middle]

sorry but I believe a liquid boils at a lower temperature when the pressure is high ...

Boiling also depends on pressure
Why ? The boiling temperature of a liquid is not intrinsic to the liquid but depends on its pressure. A physical law, the law of Clapeyron, allows (by means of numerous calculations) to draw the pressure-temperature diagram of water. Thanks to it, we can determine, in particular, at what temperature the water will start to boil for a given pressure.

Learn More
There is a pressure-temperature couple (0,006 atm and 0,1 ° C) for which water is in its 3 solid, liquid and gas states. It is called the triple point of water.

Thus, under 1 atmosphere, ie normal atmospheric pressure, water effectively boils at 100 ° C. When the pressure increases, we see that the boiling temperature also increases: it will be necessary to heat more to obtain steam.

This is the case at the bottom of the oceans where the pressure increases sharply. For example, at 3000 m under the sea, it reaches 300 atmospheres. This is why very hot springs of water, over 300 ° C, can exist without the water turning into steam. Likewise, the water used in nuclear reactors is highly pressurized to 155 atmospheres to prevent the water from evaporating.

On the other hand, when the pressure decreases, the boiling temperature also drops. At the top of Mont Blanc, the pressure is less than 0,5 atmosphere: the water boils at 85 ° C. Higher, at the top of Everest, the pressure is even lower and the water boils at 72 ° C.

[carburologue]

you can put yours too

http://www.linternaute.com/science/scie ... bout.shtml

on the other hand, I find it weird

[the middle]

you can put yours too

http://www.linternaute.com/science/scie ... bout.shtml

on the other hand, I find it weird

Carburologist ... You just put a link that explains your mistake ...
If you have skype, contact me nickname alain1959