Page 74

74

Technology Focus

Parallel compressors working together with ejectors can significantly improve the efficiency of transcritical CO2 in warm climates, while other technology innovations can also boost CO2 system performance. Accelerate reports from this year’s ATMOsphere conferences in San Diego and Berlin. – By Michael Garry & Andrew Williams

T

ranscritical CO 2 refrigeration systems have steadily gained traction in the food retail sector, with more than 12,000 installations in Europe and over 450 installations in North America, according to the latest data from sheccoBase, the market development arm of shecco, publisher of Accelerate. Most of these systems operate in moderate climates, where their efficiency outdoes that of traditional HFC systems. But for CO 2 transcritical to achieve broader adoption – particularly in the United States, where it is playing catch-up with Europe – manufacturers are working hard to improve its efficiency in warm ambient climates. CO 2’s high critical point – 31.10°C – means that at high ambient temperatures, CO 2 exists as a supercritical fluid (without distinct liquid and gas phases), and more energy is required in the vapour compression cycle. Energy-enhancing technologies like adiabatic condensers, subcooling, parallel compression and ejectors are able to increase

Accelerate Europe

Winter 2017

Accelerate Europe #9 Winter 2017  

HONOURING THE TRAILBLAZERS The past twelve months have been full of innovation in the HVAC&R sector. The winter 2017 edition of Accelerate...

Accelerate Europe #9 Winter 2017  

HONOURING THE TRAILBLAZERS The past twelve months have been full of innovation in the HVAC&R sector. The winter 2017 edition of Accelerate...