PROJECT
INCORPORATING COLD CHAIN
their replacement refrigerants, have led
the supermarket industry having to look to
alternative, long-term, future proof energy-
efficient solutions. Carbon dioxide (R744) is
rapidly becoming the industry choice for retail
and industrial refrigerant due to its favourable
environmental properties (ODP = 0, GWP = 1).
“CO 2 is a low global warming potential
(GWP) refrigerant and an excellent choice
when it comes to reducing greenhouse gas
emissions,” explains Robinson. CO 2 provides
high performance and exceptional properties
for heat reclaim, due to its high heat transfer
capabilities.
CO 2 has excellent volumetric efficiency
(more than five times the cooling effect per
volume as R22), resulting in reduced compressor
and pipe sizes for the same cooling effect, lower
consumption ratio (the ratio between inlet and
outlet pressures from the compressor), and
low viscosity (making it easier to pump). CO 2
is widely available as a by-product in several
industries and the cost of CO 2 gas is very low.
Another advantage to using a transcritical
CO 2 system is that it operates on only CO 2 as
opposed to a cascade system that uses HFCs as
well (generally R134a MT/CO 2 LT).
“When looking at the natural refrigerants,
CO 2 can be used in public spaces like retail
trading floors, where other natural refrigerants
such as ammonia is limited,” explains
Robinson.
THE FUTURE
So far, the client is very happy with the
refrigeration installation and how it is running,
confirmed Lopes.
“The site is relatively new and therefore
the plant has run for only a few months and
while the initial indicators currently show
good performance levels, we will continue to
monitor the consumption,” said Robinson.
Future plans include adding a coffee shop
above the shop floor and a 1 200m 2 liquor
store (which should be open by the end of
the year). CLA
LIST OF SUPPLIERS
Owner Evergreens
Developer Triple J
Architect / designer LN Designs
Project manager CPE
Consulting engineers
Product suppliers
CRS custom-built two CO 2 refrigeration packs for Evergreens.
COLD LINK AFRICA •
OCTOBER 2019
Wet services Pro Earth
Civil Tuss Engineering
Refrigeration CRS
Product Supplier
Compressor Bitzer
Controls Danfoss
Switch gear ABB
Brace plates heat exchange Swep
Oil management ESK
Emerson
Condensers and coolers HC Heat Exchangers
Evaporators HC Heat Exchangers
Insulation Dalucon
Racking Barpro Storage
www.coldlinkafrica.co.za
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