PROJECT
INCORPORATING COLD CHAIN
operated independently, so one room
can be on cooling, while a second
room can be on heating. Should any
component fail on one room, it will have
no effect on any of the other rooms’
operation.
Maintaining the key components is
made easy by eliminating the evaporator
from the ceiling void. This also reduced
the weight suspended from the structure
in traditional de-greening rooms. Room
layout is changed, and loading and
unloading of the room speed is increased.
This allows for quicker turnaround time.
De-greening control board with PLC.
achieved by fitting an additional
direct expansion refrigeration system.
This system will only function in the
cold room cycle. This direct expansion
refrigeration system is fitted with the
latest energy-saving equipment to
optimise efficiency. No electrical
heaters are fitted to this equipment;
defrosting is achieved by off cycle
defrosting as required.
Humidity control regulators.
This is one of the only designs around
that measure and control ethylene levels
in the room. San Group has partnered
with some suppliers in South Africa to
create a sensor that can withstand
the conditions and has managed
to successfully control ethylene
concentration in the rooms. This reduced
the quantity of ethylene gas used per
season, which results in a saving.
They also monitor the ethylene gas
bottle level, so the client will be notified
when the bottle level is low so that they
can change it over instead of running out
during the night and only finding out the
next day.
They managed to obtain 96% and
above relative humidity inside the room
on heating or cooling; this increased the
quality of the de-greening process. This
level is achieved using the latest type
of humidification and the fact that the
refrigeration system is designed to reduce
the amount of humidity removal during
UNIQUE DESIGN
The design is based on energy saving and
they currently operate six de-greening
rooms on the same power supply as the
original three rooms, notwithstanding the
fact that the new rooms are 20% bigger
in capacity as well! Each of the six rooms
can handle 360 crates.
The design is also based on the fact
that any one of the rooms can be
Ethylene gas manifold with regulators and alarm gauges.
De-greening room getting loaded.
COLD LINK AFRICA • March/April 2019
www.coldlinkafrica.co.za
17