February 2017
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MechChem Africa
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29
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Heating, cooling, ventilation and air conditioning
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Left:
Two Carrier AquaEdge 23XRV chillers were chosen to meet most of the demand from the four connected Silo developments. These chillers are able to
operate off condensed water at a temperature as low as 13 °C, which makes them ideal for chilling from the cold-water temperatures associated with seawater.
Right:
Two Carrier AquaForce 30XW-V water-cooled chillers are used for both cooling and heating. These have very high part-load efficiencies, allowing for exact
matching of the cooling capacity to the load.
generate chilled water at 7.0 °C, which gives
us a COP of between 10.54 and 13.28. This
means that the twoAquaEdge23XRVchillers
can each produce 1 500 kW of cooling from
between 113 and 142 kW.
“For cooling during intermediate months,
when the ambient temperature is closer to
the set point, we can raise the chilled water
temperature to 10 °C, which gives us a COP
of 12.7 at 100% capacity, rising to 15.85 at
40%,” Smal tells
MechChem Africa
, adding,
“on machines of this size, this efficiency is as
good as it gets.”
The Zeitz MOCAA sponsorship
The Silo District developments are focused
around ZeitzMOCAA, which sits at the heart
of this district. Surrounding the museums
will be a new central pedestrian plaza, Silo
Square, a gathering place for locals and in-
ternational visitors.
Zeitz MOCAA covers 9 500 m
2
, making
it comparable in size to the leading con-
temporary art museums in the world. It will
consist of nine floors, of which 6 000 m
2
will
be dedicated to exhibition space. In addition,
an educational floor will help to foster a new
art-loving, museum-going audience.
The task of repurposing this historic
Grain Silo at the V&A Waterfront, once the
tallest building in Cape Town, was given to
internationally-renowned designer Thomas
Heatherwick. This provided the opportunity
not only to appropriate a former industrial
building to display art, but also to imagine a
new kind of museum in an African context.
The R500-million redevelopment proj-
ect was announced in November 2013 as a
partnership between the V&A Waterfront,
and former Puma CEO and chairman Jochen
Zeitz. The key challenge has been to pre-
serve the original industrial identity of the
Heritage-listed building, and to retain choice
pieces ofmachinery to illustrate andmaintain
its early working character. Heatherwick
Studio’s final design reveals a harmonious
union of concrete andmetal, with crispwhite
spaces enveloped in light.
While the main goal of every museum
is to make objects accessible to the public,
researchers and other institutions, it also has
to ensure the long-term safety and preserva-
tion of the collections. Objects need one set
of conditions, whilepeoplemayneedanother.
Achieving both is the ultimate aimof having a
controlled environment.
At the MOCAA, this will be achieved via
sophisticated air-handling units, controlled
via the building’smanagement system(BMS),
and supplied centrally with chilled and/or
hot water circulating through the Carrier
AquaEdge and AquaForce chillers in the Silo
District’s centralised plant room.
Carrier is no stranger to the world of mu-
seums and art collections, having installed an
innovative heating, ventilating and air-condi-
tioning (HVAC) solution for theSistineChapel
tohelppreserveMichelangelo’smasterpieces
againstdeteriorationcausedbytheincreasing
number of visitors.
Ongoing developments
The next exciting project for Carrier? “We
are doing something similar for the Canal
District, a mixed-use development linking
the V&AWaterfront to the Cape Town CBD.
As with all other V&A projects, the buildings
involved will employ best-practice green
design principles that target 5-Star Green
Ratingsusing theGreenStar SAOfficeDesign
VI rating tool,” Smal says.
“We have worldwide experience in best-
practice green HVAC solutions, and the local
experience and service support to imple-
ment and maintain our technology. With the
R600 000ZeitzMOCAA sponsorship, we are
also demonstrating our willingness to give
back to communities, and to ensure that our
technology brings long-term benefits,” Smal
concludes.
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