PROJECT
INCORPORATING COLD CHAIN
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Plant safety and compliance with
international good practices have been
applied throughout the plant. A total
of 23 CO 2 sensors are installed in the
trading area, cold rooms, and plant
room with lights indicating green when
levels are safe in each area. All piping
is labelled to indicate direction of flow
and liquid or vapour. The plant room
also has an enclosure with pipe stubs
for technicians to connect reading
equipment to each circuit during
maintenance and fault finding.
The hybrid gas cooler was supplied
by HC Heat and includes four 910mm
EC fans, stainless-steel piping, and
integrated Carel controls. Water to
the hybrid gas cooler is harvested in
the basement from the HVAC, cold/
freezer rooms and cabinets, filtered,
and then pumped to the roof where it is
stored and supplied to the gas cooler as
needed.
The entire refrigeration system is
controlled and monitored by a Carel
electronic control network, which means
remote monitoring and adjustments can
be done 24/7.
All evaporators are fitted with Carel
electronic stepper expansion valves.
Cabinets were supplied by Colcab
and installed by Recold.
Piping to the shop floor comprises
walled copper pipe specially imported
by Matador Refrigeration and runs are
over 100m each with a vertical lift of
approximately 12m; double risers assist
with oil return. High-pressure piping to
and from the gas cooler are made of
1. Each lead compressor has an ABB VSD
to maximise efficiency. The fourth VSD is
mounted on the rear side of the rack.
2. The level of CO 2 at each of the 23
sensors can be viewed on the monitor
in the plant room.
3. The fourth VSD.
4. Sensors monitor operating parameters
and transmit to the plant management
system.
5. The cabinets were supplied by Colcab
and lined up by Recold. This is the
speciality half-height processed meats
cabinets.
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www.coldlinkafrica.co.za
schedule 40 stainless steel, and were
tungsten inert gas (TIG)-welded and
X-rayed to ensure there were no leaks.
EFFICIENCY MATTERS
The layout of the Centre Point store has
been based on maximum efficiency,
appealing to the shopper and with least
impact on the environment.
Features aimed at maximum efficiency
include:
• High-efficiency Colcab CO 2
evaporator coils in all cabinets;
• High-efficiency ebm-papst fans in
cabinets;
• LED lighting throughout;
• Acrylic doors on vertical cabinets;
• Manually operated night blinds;
• Sliding covers on island freezers;
• 4 × 910mm-diameter ebm-papst fans
with EC motors on the CO 2 hybrid
adiabatic gas cooler; and
• ABB variable frequency drive (VFD) on
the lead compressor of each circuit.
The efficiency is evident from the compact
rack and plant room in comparison to the
expanse of the store with a trading area
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COLD LINK AFRICA • March/April 2019