Since I am not much aware of the CO2/NH3 system and I am yet to come accross one which has been and in operation in our country, I would like to ask a (maybe a stupid) question. But as I have said earlier, that I have no experience in these systems as I have been handling mostly halocarbons.

My question is that could the CO2 in the lower stage be used as a DX system with suitable TEV and Air Cooling Unit for maintaining the desired temperature in the rooms or we have to chill the brine solution and circulate the same through Coils?

From the Forum it appears that a lot of work in this field are being done in Europe and USA.

With best wishes.