MechChem Africa February 2017

February 2017

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MechChem Africa

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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

, 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

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.