Makro has a preferred refrigeration design they use on their larger format stores.
The system has been designed to minimize refrigerant leakage, reduce the energy consumed, whilst ensuring progress towards lowering their CO2 footprint.
The store was upgraded from a Freon to a CO2 store in 2016.
Makro worked alongside CRS to develop a more environmentally conscious system for the Makro Strubens Valley store that combined the lower GWP and improved energy efficiency of a new CO2 refrigeration system. Makro chose to upgrade the existing system to a CO2 system to control future operating costs and to meet energy and sustainability goals. Within this system CO2 levels are monitored for leakage, however, because CO2 is a natural gas, this system do not pose the same risk to the environment as traditional HFC systems.
The system used for Makro Strubens Valley is a Transcritical Booster system with parallel compression. The advantages of a parallel compression system is instead of expanding the flashgas to the Medium Temperature Section pressure and then compressing the flash gas to the gas cooler pressure, a parallel compression system directly compresses the flashgas to the gas cooler pressure.Therefore the power used to create a lift for the flash gas between the MT-suction pressure and the receiver pressure, is saved on a parrallel compression pack, making it energy efficient. Especially for high ambient temperatures.
Electricity for refrigeration makes up 50% of the total energy consumption of the store. Makro has an ambition to cut down this consumption year by year as part of their sustainability program. Another goal is to switch to natural refrigerants like CO2 to cut the carbon footprint.