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Trucks line up in Halle
After considering which natural refrigerant would best match their needs, his team opted for propane (R290) for in-store cooling. “It’s not that we think CO2 is bad. After an honest evaluation, we think propane is the best solution for us,” Bootsveld says. His team installed their first propane system in an OKay store in Roeselare in 2013. It took a year to secure the necessary paperwork – even though the 14kg of propane was housed outside. “We couldn’t go through that 40 times a year to comply with the regulations,” Bootsveld says. The current blueprint is based on two or three small refrigerant circuits each with a maximum propane charge of 2.5kg, and a secondary system that uses propylene glycol to bring the cold to where it is needed.
At the system’s heart are compact chillers containing less then 2.5kg of propane. With a refrigeration capacity of 30 to 50 kW, one chiller can cool the smaller OKay and Bio-Planet stores. The Colruyt supermarkets need to run two compact chillers. An extra chiller is always added redundantly, ready to step in should the other fail. Using a smaller refrigerant charge means they can be placed inside the store. The principle of the plug-and-play system was devised in August 2014. The system was first installed in a Bio-Planet store in Mons in November 2015. It has since been installed in three further Bio-Planet stores in Hasselt (January 2016, in Jambes (February 2016) and in Braine l’Alleud (April 2016). continued on p.36
September 2016 Accelerate Europe
Transgourmet targets 100% CO2