Carbon Dioxide Refrigeration

[Josip]

Hi,

As far as I was made to understand that CO2 are used only for single stage compressors, but now I understand that with NH3 it could used for two stage so as to lower the temperature further.

It is still a single stage compressor (for each system NH3 and for CO2) but it is two stage plant. With CO2 is not possible to use, for example: one single compressor having two stages as we can use for *****s or for ammonia.

We can obtain those temperatures also with ammonia but it is not economical at all. I have here in my country one system with 3 stage ammonia sistem (built before 20+ years) -60/-35/-10/+35 but they stop to use -60 compressors. You spend so much energy for very small work.

Best regards, Josip