Projects
1 . The third floor auditorium was designed as a stand alone system .
2 . Selected square plate swirl diffusers . Diffusers and ductwork were coordinated and carefully positioned to provide an aesthetically pleasing look .
3 . The building design incorporates various pause areas with a retro look – exposed ducting and hanging bulkheads .
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As a result of the people-density in the building , the fresh air is pre-treated via a roof top packaged unit ( RTPU ) before entering the building to reduce the fresh air load on the internal hide away units ( HAU ).
This resulted in a reduction in the HAUs capacity , and overall VRF systems capacity , which aided in the design of the constrained place room size on the roof . As a result of the structural constraints of the building , the outdoor unit ’ s plant was positioned around the parimeter of the roof top plant room as a result of the structural integrity decreasing towards the middle of the roof plant :
The fresh air system also contained pressure differential sensors over the filter banks to indicate to the facilities management team when the filters were dirty and required to be cleaned . This was some of the many systems implemented to ensure the maintenance of the system was as user friendly and efficient as possible .
The building utilises a common mechanical extraction system for the ablution facilities . The extraction system , along with the VRF outdoor units , is located on the roof plant room . Although the common fresh air system is also located on the roof plant room , the system was designed in such a way to prevent any cross contamination by analysing predominant wind flow direction , as well as sufficient distance away from one another .
Indoor hide away units ( HAUs ) and cassettes are supported from the slab on each floor within the HVAC zone and the indoor units were thermally zoned to serve the perimeter and internal zones individually . This arrangement prevents the
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RACA Journal I January 2021 www . hvacronline . co . za