Read on to know more about the first 3 technology case studies selected for ATMOsphere America 2014's Commercial refrigeration session...
- Controlling Transcritical CO2 Refrigeration for Sustainable System Design by Peter Dee, Danfoss
This presentation will examine the work done with Whole Foods Market at its new, 56,000-square-foot store in Brooklyn, NY – the first 100% HFC-free supermarket in the U.S., with transcritical CO2
and CHP systems. To help meet the company’s sustainability objective, Danfoss provided a comprehensive controls solution, including refrigeration rack, case, and system controls, and supported the design of the store’s HVAC system to improve energy efficiency. Specifically, the presentation will discuss the refrigeration and energy management control solutions used in Brooklyn, and how these control strategies are scalable.
- First North American-Built CO2 Copeland Compressor Supermarket Rack by Andre Patenaude, Emerson Climate Technologies
When Sobeys was building its latest IGA in Magog, Quebec, it chose to use CO2
as the refrigerant to cool those specialized areas of the store that need strict temperature control. Sobeys chose Emerson Climate Technologies, which had significant experience designing CO2
systems, to help meet the high-pressure challenges inherent in using CO2
. This presentation will show how the CO2
-based refrigeration system comprised of 11 transcritical semi-hermetic discus and four scroll compressors from Emerson Climate Technologies, including valves and drivers designed specifically for use with CO2
, provided Sobeys with reliability, efficiency and peace of mind.
- Adiabatic Gas Cooling Enables Expanded CO2 System Geographical Applications by Tommy Gaubatz, Güntner US
The key to improving CO2
refrigeration system COP in warmer climates is enabling the equipment to operate in a sub‐critical mode with as low condensing temperature as possible. This objective can be accomplished via adiabatic pre‐cooling of the ambient air for the gas cooler/condenser. Controlled testing of adiabatic performance has validated the system capabilities, and system ASHRAE weather bin‐based models predict the dramatic efficiency benefits for warmer climates. Based on the new performance levels, CO2
systems will now be able to efficiently operate in all North American climates, effectively eliminating the final climatic barriers for more widespread adoption. Adiabatic systems can also achieve these results with significantly lower water use than traditional evaporative condensing systems.