Cooling System
Unlike typical refrigerated warehouses using direct expansion
evaporators, Sobey’s warehouse uses an ammonia central chiller.
Having one big system instead of several small ones allows for
higher efficiency. Ammonia is one of the best refrigerants to get
high efficiency, and has no ozone depletion
potential and zero global warming
potential. The cooling distribution system
is also using secondary fluid (glycol)
instead of direct expansion of ammonia,
which is much safer for the employees.