PROJECT
INCORPORATING COLD CHAIN
RAISING THE STANDARD
Coolcare had the continuous technical
engineering excellence with all the latest which the client is very happy about.
technologies in CO 2 available on the The topping up of refrigerants is also
support of the experts from both SCM market and certainly sets a benchmark
Frigo in Italy and Metraclark in South Africa for the refrigeration industry.
throughout the entire process to ensure a
significantly cheaper than the old system.
“The system is working very well and I
have no complaints,” says Pereira.
successful installation and functioning plant. MAINTENANCE Many other suppliers of components were Coolcare is on 24-hour standby for it properly,” adds Pereira. “You have to
also present on site to provide additional Meat World Springs. They also do a keep up standards and work on uplifting
assistance and support where required. thorough check and basic plant service the meat industry.” Meat World places
once a month. very high value on quality and not only
Energy savings calculation software
was used to perform a comparison
“If you’re going to do something, do
are their own quality control processes
between a conventional synthetic A HAPPY CLIENT refrigerant R404A system and the new The previous Meat World facility had entire supply chain to deliver to the
CO 2 system proposed and theoretically a multiplex refrigeration system with same standard. It is no surprise then that
synthetic refrigerants. The new CO 2 plant they held the construction team to the
CO 2 system of 13%. This project was is currently realising energy savings of same standard, expecting only the best.
about 30% compared to the old plant, No shortcuts were taken.
showed an average savings on the
a collaborative effort and boasts
very stringent, they also expect their
Due to the high ambient temperatures often experienced in these
parts of South Africa, it was vital that this system could
operate trans-critically as well as sub-critically.
CO 2 BOOSTER SYSTEMS
EXPLAINED
Booster systems are systems with two
temperature levels; namely medium
and low. This is due to the fluctuation
in ambient temperature. When the
ambient temperature is below the
critical temperature, the system
operates as a subcritical system,
however, when the ambient rises to
above critical temperature, the system
operates as a trans critical system by
using the condenser as a gas cooler.
The booster system incorporates
both medium and low temperature
capabilities in a single unit, as the
compressors selected can be used
for a wide range of refrigeration
loads. It saves space and allows
the system to run optimally and
can accommodate all the design
requirements in one system.
WHAT MAKES THE BOOSTER
SYSTEMS DIFFERENT?
•
•
•
•
•
There is a special condenser
that works as a gas cooler under
higher ambient conditions (trans-
critical operation)
The compressors for both
medium and low temperature
applications need to be selected
carefully in order to ensure
optimal capacity control during
partial load conditions.
The same refrigerant is moving
between the medium and low
temperature compressors. The
low temperature compressors
discharge into the suction line
of the medium temperature
compressors, the low temp
compressors act as a booster to the
medium temperature compressors.
The condenser design is optimised
for the best performance for
both subcritical and trans-critical
stages.
You can obtain hot water
and cold water recovery from
the same system and during
the trans-critical phase the
discharge temperatures are
higher, which provides more
potential for heat reclaim. CLA
Rigging the outdoor plant room equipment into place.
LIST OF PROFESSIONALS
Owner
Design Refrigeration Metraclark
Contractors Refrigeration Coolcare (part of the Brasco Group)
Refrigeration equipment Metraclark
Refrigeration packs SCM Frigo
Heat exchangers Modine
Compressors Bitzer
Controls Danfoss
Gas A-Gas
Leak detection Samon Leak Detection
Water tanks Roto Tank
High-speed doors Dynaco
Product
suppliers
Danfoss vapour ejector.
COLD LINK AFRICA •
SEPTEMBER 2019
Angelino Pereira (Meat World)
www.coldlinkafrica.co.za
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