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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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useful1

7 years ago

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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steveastroukuseful1

Reply 7 years ago

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

11 years ago

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

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trebuchet03NachoMahma

Reply 11 years ago

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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chooseausernametrebuchet03

Reply 11 years ago

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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trebuchet03chooseausername

Reply 11 years ago

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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trebuchet03Weissensteinburg

Reply 11 years ago

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

7 years ago

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

9 years ago

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

11 years ago

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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NachoMahmamicrosuperman

Reply 11 years ago

. 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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NachoMahmaNachoMahma

Reply 11 years ago

. 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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LasVegasmicrosuperman

Reply 11 years ago

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

11 years ago

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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LasVegasgyromild

Reply 11 years ago

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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trebuchet03LasVegas

Reply 11 years ago

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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LasVegastrebuchet03

Reply 11 years ago

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

11 years ago

Say that ten times fast!