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evaporative ammonia refrigerator Answered

I was wandering if anyone knows how to make an ammonia evaporator refrigerator system. I am looking for something that is equivalent to commercial ammonia evaporator refrigerators. Thanks

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Tyramead (author)2013-07-09

I agree Ammonia can be very dangerous and preventing leaks can be very difficult. still however there must be a working design somewhere. This looks like a good start

http://upload.wikimedia.org/wikipedia/commons/archive/0/09/20090903200541!Absorption_fridge.jpg

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useful1 (author)2011-02-23

I too would be interested in an instructable in an ammonia refrigerator. There is zlitch info I could find via google on instructions or a make build.

Closest I could find to a diagram would be an einstein refrigerator. But it lacks specifics. I would be building a empty hull without knowing how it works, if I followed the image of the einstein frige in the US patent office.

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steveastrouk (author)useful12011-03-05

You really don't want to mess with Ammonia, it kills very easily. The toxicity of ammonia is why CFC was invented.

Steve

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NachoMahma (author)2007-08-15

. Same basic principle as a Freon unit - compress a gas to liquid, shed some heat, expand to a gas, repeat.

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trebuchet03 (author)NachoMahma2007-08-16

There's another way :D You can use a heat source, rather than using a mechanical compressor ;) This is how propane refrigeration systems work.

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jisgleas (author)trebuchet032011-02-28

explica como seria el sistema

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user

The heat vaporizes the refrigerant, and it comes back to liquid thanks to the radiator (black grid at the back of the refrigerator), and go down to the source of heat thanks to the gravity ?? Sounds interesting ... But that must be difficult to DIY ...

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user

Possibly a difficult DIY -- I think weak and strong solutions of ammonia are involved too :/ But anything worthwhile takes a bit of homework and investment ;)

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user

IMO the dollar store is worthwhile =]

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user

Hahaha -- I was getting at a time investment ;) It made me sad to find out that IBC root beer would no longer be sold in glass bottles at the dollar store (it's now in smaller cans - but still bigger than a 12oz) :(

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rudi138 (author)2011-01-25

Microsuperman

Type in "Larry Ball's Icy Ball" & there is an explanation of how to build a type of refrigerator that the Crosley corporation used to build in the 30's & 40's.

He shows how to build the "Icy Ball" with normal pipe fittings, gauges,& valves.

Enjoy

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ShaggyShaggy (author)2008-10-06

you don't have to 'produce pure ammonia' you buy it. there are other refrigerants that can be used. it's a closed loop system. it will last like 50 years or so!

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microsuperman (author)2007-08-16

Was I am meaning the kind that burn natural gas or kerosene I have found that there proper name is absorptive refrigerator.
Like this one Gas Refrigerator

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NachoMahma (author)microsuperman2007-08-17

. There is a more descriptive phrase for what you are looking for, but I can't think of it. My Dad used to have an air conditioner that was a natural gas fired ammonia unit, but he can't think of the "generic" name, either. We both think there is an adjective that goes before or after absorptive that would narrow your search a lot. Maybe someone else has a better memory.

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NachoMahma (author)NachoMahma2007-08-17

. BTW, Dad's AC was branded ArkLa (local nat gas distrib many yrs ago). Maybe you can find something on them.

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LasVegas (author)microsuperman2007-08-16

The first consumer refrigerators were natural gas powered, but the electric refrigerators, while much noisier and less efficient won out because they were also much less expensive.

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gyromild (author)2007-08-16

Like nachomahma said you need to pressurize ammonia (with a compressor), so that it's in liquid form, (ammonia has boiling point of -33Cecius).
The liquid ammonia need to be channel through an evaporator. In a simple setup,thats the tubings that run through the chamber that you want to cool.
Pressure in the tubes are less, ammonia will start to boil and evaporate while absorbing heat from the tubings (thus the tubings get cooler).
The gas is then compressed back to liquid. (releasing heat) that is dissipated through heatsink (normally attached at the back of the fridge)

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LasVegas (author)gyromild2007-08-16

And then you have the problem of producing pure ammonia is a safe manner and assuring that the refrigeration unit is absolutely safe from ever leaking.

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trebuchet03 (author)LasVegas2007-08-16

The beneficial thing about ammonia is.... If it ever did leak, you'd know immediatly :p I wonder how commercial systems do it...

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LasVegas (author)trebuchet032007-08-16

The beneficial thing about ammonia is.... If it ever did leak, you'd know immediatly :p

Yes! You'd be dead! It's not like opening a bottle of ammonia in solution with water (35ppm max). Pure ammonia is deadly.

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Juklop (author)2007-08-15