This paper describes a new high efficiency refrigeration system adopted in large scale supermarkets

in which parallel compressor unit is the core technique. Detailed comparison to the traditional system so called 'one compressor vs multiple end-units' is also performed. Being practically utilized in many large supermarket projects such as Walmart

Auchan

and Carrefour

this refrigeration system is confirmed to be more safe and reliable

and temperature control of showcase and cold storage room is more stable. Moreover

the system energy is significantly saved by 18% and original investment cost is saved by 20%.