MechChem Africa February 2017

⎪ Heating, cooling, ventilation and air conditioning ⎪

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. q

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.

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

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.

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