Projects
Two new Evapco induced draft condensers were installed
with closed coupled mono-block type circulating pumps that
circulate water over the galvanised coil. A closed loop cooling
circuit for the compressor oil is also installed in each unit. Each
condenser has a divider plate between the four fans to be able
to switch off two fans when not needed so as to avoid short
cycling the air.
A condensate collection tank is used to collect all the
water from the evaporators when defrosting, which is then
pumped to one Evapco condenser. The water treatment of
these condensers was specially adjusted to accommodate this
condensate water.
1
Heat rejection rate: 1 111.4kW (each)
Condensing temperature: 33°C
Wet bulb temperature: 21°C
A monitoring system from Carel Controls called the BOSS
system was used. All the PLC equipment used to control the
plantroom as well as all the valve stations for the cold rooms
are wired via building management systems (BMS) cards.
Additional PLC units have been installed to accommodate
evenly spaced temperature probes installed in all three holding
freezers as well as the chill store and the five blast freezers.
The monitoring system is set up to send a report of all the
various temperatures to the client every day. The BOSS system
is also accessible remotely to check system operations off site.
It has once again been proven
that with efficient project
management and the
necessary communication,
anything is possible.
2
3
EFFICIENT PROJECT MANAGEMENT
It was immediately clear that the installation period of this
project would be extremely tight, with the site handover
expected to be on 1 March 2018 and the intended practical
completion to be on 1 of August 2018, including all the building
works and refrigeration.
Stuart Walls and his team from Capex were appointed as
the principal agent of this project. They compiled a detailed
programme that was closely monitored every day to ensure
all the contractors were up to date with their individual
responsibilities and programmes.
Design changes and customer preference delayed
the delivery of the capital equipment of the refrigeration
installation, but because of efficient project management from
MRE’s team as well as effective communication and planning
from Capex, they were able to meet the deadline set out.
It was mentioned by all the contractors and bystanders that
the deadline was impossible, but it has once again been proven
that with efficient project management and the necessary
communication, anything is possible. RACA
1.
2.
3.
46
RACA Journal I June 2019
Evapco condensers and liquid receiver.
Distributing the cool air over the products.
Products ready for dispatch.
www.hvacronline.co.za