2017 Tech Report Nov-Dec

bulb temperature is 79ºF. The adiabatic gas cooler can deliver air that is between 81ºF and 82ºF to the gas cooling coil. It is now practical to use a transcritical CO2 system in this location. By using some of the alternative transcritical systems, such as parallel compression and parallel compression with ejectors, operating efficiencies competitive with or better than comparable halocarbon systems can be achieved. CO2 systems in general offer some advantages, in particular

the reduction of refrigerants with high ODP and GWP factors. When used in cascade system with refrigerants like ammonia, that is seeing increased regulatory demands, the ammonia charge and leak potential can be reduced, and the ammonia confined to the machinery room. The transcritical systems offers even more advantages:

• a low-cost refrigerant, • simple systems,

• reduced installation cost, • reduced refrigerant charge, and • comparable or better operating costs. CO2 may not have moved into your neighborhood, but there is a strong likelihood it will be sometime in the future. It never hurts to learn more, so why not expand your knowledge base and learn more about a new— really old—refrigerant.

• no halocarbon, • no ammonia, • a single refrigerant,

RETA TECHNICAL REPORT PAGE 6