The Blissfield “maintenance free” clog-free CO2 gas cooler solution features all-steel continuous tube construction with compact tube pattern for optimal performance, says the company.

Sporlan will display a new range of valves and controllers rated for transcritical CO2 (R-744) high pressure refrigeration systems. The line includes gas cooler valves and flash gas bypass valves.

The use of CO2 as a refrigerant in transcritical refrigeration applications has received Underwriters Laboratory (UL) listing. Hillphoenix Inc. announced that its Advansor by Hillphoenix CO2 booster refrigeration system has received UL listing in both the United States and Canada.

My column in the Nov. 12 issue of The NEWS focused on HFCs, especially low GWP HFCs as retrofits for R-22 systems. This column will focus on what I used to call “beyond HFC” refrigerants, although these days, the term might be “other than HFC” refrigerants.

One sector where CO2 is making the strongest inroads in the United States is in supermarkets as more stores and refrigeration manufacturers embrace its use. Where are two recent examples that make for good reading?

Two recent refrigerant developments focus on CO2 and HFOs. One relates to CO2 in refrigeration; the other is an announcement of an HFO in air conditioning.

The significance of a recent two-day conference was not only the extensive presentations regarding natural refrigerants such as CO2, HCs, and ammonia, but where the meeting was held — Washington, D.C.

Using CO2 requires a different system design than the traditional HFC-based system. In fact, there are three standard design types that exist in the application of CO2 as a refrigerant in commercial food retail refrigeration systems. Each type can have variations to meet different requirements or to increase benefits.