Dimethyl Ether as a refrigerant

[Horatiu]

Hello everyone! :)
I know that Dimethyl Ether (DME or RE170) can be used as a refrigerant. The main disadvantage of DME is its exlopsivity and the main advantages are 0 ODP and 2 or 3 GWP .Theoretically it can be used only in very small refrigeration plants. Do you actually know or heard about someone really using it?

[US Iceman]

Here is another twist on the same subject:

R-723
composed of (60%) Ammonia & (40%) Dimethyl ether (% on mass basis)

http://www.eurammon.com/englisch/download/eurammon12en.pdf

This is the only application I have heard of where dimethyl ether is used. At least in the last 50 years or so I am aware of.