PROJECT
INCORPORATING COLD CHAIN
Woolworths Kyalami takes
CO 2 to the next level
By Commercial Refrigeration Services (CRS)
The custom-built, locally manufactured CO 2 refrigeration pack for the Woolworths store in the upmarket
Kyalami shopping centre, takes care of the store’s refrigeration and heating needs.
F
or this project, CRS manufactured
a compound (two-stage) trans-
critical booster pack with parallel
compression. It consists of medium-
stage, low-stage, and intermediate-
stage racks, which are controlled by
individual rack controllers with their own
separate suction, operating, and safety
set-points.
Each medium-temperature cycle
consists of three compressors and
each low-temperature cycle consists
of two compressors. The intermediate
temperature cycle also consists of two
compressors and share a common
discharge line with the medium-
temperature rack.
The medium- and low-temperature racks
share a common liquid line and separate
suction lines to accommodate two
separate evaporating temperatures; the
low-temperature refrigeration discharges
into the medium-temperature suction
and in this regard, the low-temperature
rack is reliant on the medium-temperature
rack to maintain the low-temperature
compressor’s discharge pressure within the
design envelope.
The pack is designed to have a plant
room evaporator coil to ensure the plant
room area is maintained within acceptable
ambient temperatures of a maximum of
25°C.
Plate heat exchangers are used for
heat reclaim; these heat exchangers
1
1. CRS custom-built CO 2 refrigeration packs for this store.
2. The fridges inside the Kyalami Woolworths store, connected to the CO 2
pack for all their refrigeration needs.
3
3. Health and safety regulations are crucial for CO 2 installations.
2
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www.coldlinkafrica.co.za
COLD LINK AFRICA • January/February 2019