Quote Originally Posted by permafrost888 View Post
May i ask why you don't recommend CO2? The reason we're looking at CO2 is for safety (food and otherwise) reasons. Our potential clients like Nestle require that we use "safer" refrigerants like propylene glycol or CO2. What other refrigerants might fit these requirements?

I don't have figures yet in terms of kw or compressor sizes. I do know that our capacity will be around 15,000 tons.

Thanks.
Its my opinion & in Australia I believe its mainly used in supermarkets.

Nestle still use ammonia, but it can depend how big plant is.

CO2 has higher pressures than normal fridge plants.
If system is stopped for a period relief valves will vent most of it.
Specialized equipment required, as well not a lot of general refrigeration companies work with it.
You need detectors for CO2 in rooms & areas of poor ventilation for personell protection.
You still need an ammonia or other refrigerant to run chillers & to condense CO2

Glycol is good as well for secondary refrigerant in air conditioned rooms or process areas.