Quote Originally Posted by Peter_1 View Post
40%??!! We all have to change to CO2 now. Com'on be serious, this isn't true and it can't be, even not pure thermodynamical, so certainly not in a real life situation. Give us precise and real numbers and then we can talk again.
40% savings is peptalk for salesman.
I was at Atmosphere 2010, a very big congress about CO2 and there was another story heard.
I'm suprised that you will buy into the global warming with little or no tangible evidence but doubt energy savings of using CO2. I'll attempt to provide you with the necessary data to back up that claim.

I did make a mistake, -40 degree rooms see a 30% energy savings, you dont reach 40% untill you get below -50 degrees C

Compared with conventional two-stage or economized single-stage systems,
a CO₂ /NH₃ System uses significantly less power.

you can see some of this information at
http://mmrefrigeration.com/co2compressor.html

Also here is the PDF file M&M Refrigeration sent us containing actual data from a US Cold Storage plant they installed a CO2 system in.

http://www.gcapcoolcast.com/20101001101734532.pdf

I have spoken with the engineer of this facility before and he assures me that the savings are real.