Refrigerator operating with butane gas

[caracole]

Hello,

I bought a gas fridge (I will not mention the brand) because where I am, I have no electricity or enough autonemie to let 24h / 24 operate a fridge with freezer.

This type of fridge works perfectly. less than 6 hours later I had ice cubes! then I put it to a minimum because it was so cold!
I do not know yet the autonomy of my bottle butane, it seems that it turns around 25 has thirty days ...

Since it is a small flame that heats a circuit (it makes me think of a stirling ...) would it be possible to use another source of heat that gas? sun for example where muffler my big generator ... and also why not produce a little electricity with such a peltier circuit to power the lamp of the fridge, rather than using batteries?

Ideas ?

Sincerely,

caracole

[dedeleco]

It reminds me when I went in a caravan with this type of fridge, and the hot part had an asbestos insulation that we were not suspicious (a few fibers!) Fortunately ventilated to the outside !!
I had the same autonomy of a month with butane bottle in hot weather !!!
Just heat the hot part (isolated with other than asbestos, check, even the rockwool is dangerous) and it will work!
Any means is good, bringing the necessary temperature (to be measured along the column).
Sun with parabola or fresnel lens, the muffler may overheat if too well coupled, and a Peltier circuit (upside down multistage for voltage) can power the lamp of the fridge with the sun or the pot exhaust, or heating, and even led lighting.
The easiest way is to recharge a battery with a small photovoltaic solar panel, cheaper than the Peltier or a small wind turbine
see :
https://www.econologie.com/forums/faire-de-l ... 69-70.html
https://www.econologie.com/forums/faire-de-l ... 69-60.html

[Former Oceano]

It's an absorption fridge. It works with any heat source. Some also have an electrical resistance to operate with electricity.

[oli 80]

good evening, it reminds me that dedeleco had once posted something on the subject of the pulser pump, about this principle a bubble pump I think

[dedeleco]

This type of fridge absorbing more than 80ans (developed in the 1930 years), very practical has a lower yield than with electric motor compressor and so electrically heat seems little consistent or even anti-ecological.
I have the impression that if electric, a Peltier module fridge is just as good. I use one to 30 € to travel by car, a cooler small fridge, which moreover does not need to be horizontal, like the one to absorption.

For caravan, electric in camping, a fridge with several modules Peltier must be as profitable.

Finally, there are thermoacoustic systems Stirling engine and fridge on a single tube with nothing mobile apart from the oscillating internal gas, and they are very remarkable!
http://www.mecheng.adelaide.edu.au/avc/thermoacoustics/
http://www.mecheng.adelaide.edu.au/avc/ ... stract=493
http://www.mecheng.adelaide.edu.au/avc/ ... as2009.pdf
We heat one end of the tube and the other end is cold!

http://www.americanscientist.org/issues ... issue.aspx
http://www.americanscientist.org/issues ... -of-sound/

[caracole]

Hello,

As I wrote in my first post, the autonomy of a bottle of butane gas from 12Kg was 25 days - Fridge set to minimum -
12 € / 25 = less than 50ctimes € per day! There is no photo, it is very economical - only the investment 790 € 220litres + 31litres freezer.

Pierre

[Forhorse]

This kind of refrigeration circuit works with ammonia if my memories of my "air conditioning" courses are correct.
It is therefore sufficient to find a source of heat capable of producing a temperature at least equal to that of the vaporization of ammonia is good. (theoretically -33 ° C, but I guess pressure conditions make it much warmer )
Those who want to find the minimum temperature for the operation of this kind of refrigerator can possibly start there:
http://fr.wikipedia.org/wiki/R%C3%A9fri ... ion_de_gaz
(I'm lazy)

EDIT: I just found that the ammonia at a boiling temperature of 38 ° C, I suppose that is therefore theoretically the minimum temperature necessary to establish the cycle of this kind of refrigerator, it is that is all weak . Suffice to say that it can probably work with any heat source

[chatelot16]

no it's more complicated than that

the heat boils ammonia in water

the gaseous ammonia will lose its heat and condense in a radiator: then frait of the cold by evaporating at low pressure

and the steam amoniac is dissolved in water that has lost ammonia by heating

In the first freshness machine, there was a pump to return the ammonia solution to the boiler

in the small fridge has absorbtion there is a tip more with hydrogen in the circuit to do without pump

[dedeleco]

The bubble pump is a remarkable tip:
http://www.me.gatech.edu/energy/andy_phd/three.htm#IIIE
http://www.me.gatech.edu/energy/andy_phd/one.htm#ID1
see also oli80 links.

Otherwise I find very remarkable the recent thermoacoustic systems, Stirling and fridge without piston.
One end is heated and cold is obtained at the other end.
https://www.econologie.com/forums/post168456.html#168456
https://www.econologie.com/forums/post163636.html#163636

In my opinion they will develop in the future.