Dear all,

I write you from France, a country very late concerning NH3 development.
I am employed by STEF-TFE and I am in charge to retrofit a lot of industrials installations (R22 pumped technologies).
Add to this refrigerant problem, we would want to reduce cooling tower due to water consumption and water hygiene.
The goal is to change installations for news concept in accordance with Kyoto protocol.
I think the best solution is to use NH3 for primary refrigerant and a secondary refrigerant.
The secondary refrigerant should be Glycol for +2°C(35°F) air cold room temperature and must be CO2 for –25°C(-13°F) air cold room temperature.
To use NH3 is a good solution concerning energy saving but this fluid is dangerous when the charge is big.
Today, CIAT, MYCOM are able to deliver NH3 chillers, but all of there are supplied with a water condensor.
So, my question is, do you know a manufacturer of external chiller (like RTAC from TRANE) for cooling capacities from 150 to 800 kW (40 to 230 tons) with shell and tube evaporator and air condensor.
Thank you in advance.

David

nota : Excuse me for my french english !