Architect and Builder Magazine South Africa Feb/Mar 2018 - Page 32

HVAC and Plumbing HVAC is controlled via centralised plants that are on the roof and reticulate down shafts adjacent to the central core. Return air rises through the atriums and is pulled back into the plant rooms via a massive ventilation plenum that surrounds the atrium void. The HVAC allows for economy cycle cooling where the system will, as far as possible, use outside ambient air to cool the internal space. This allows for substantial energy savings for large parts of the year. All showers and irrigation in the building reticulate to a centralised grey water plant, with that water being processed and re-used for toilet flushing and irrigation. All toilets are low volume flush, and all taps have flow restrictors fitted. Sustainable Elements The building has achieved 5 star Green Star design rating, and the Green Star Interiors V1 As As-Built rating is in the process of being applied for. Apart from the HVAC and plumbing strategies mentioned above, indigenous planting has been used throughout to reduce water usage. Cyclist and jogging change facilities and showers are provided. All lights are LED. Internal blinds are automated and controlled by a suntracking system that adjusts the blinds angle as the sun moves across the sky to minimise glare and maximise light into the floor plates. The ‘Glassing’ of Discovery - Pure Consulting Pure Façades were part of a bid that won the contract to build a new headquarters designed for Discovery’s special requirements. They were therefore on the Design Team as the Specifying Façade engineer’s and designers from the very beginning. Pure’s Neil MacLeod gave his thoughts on the façade. “The main façades are continuously curving inner and outer glass planes forming a draped ‘camisole’ around the building. They are aluminium framed with high performance double glazing. Some people say the glass is a bit on the dark side but that is because it was selected after intense debate and analysis to favour occupant comfort near to the façades over clearer options. The canopies are single glazed with thick sandblasted glass for shading and to hide the dirt when they have not cleaned the glass! The roof lights are very special and were not easy. Tears and blood were shed metaphorically and tempers were lost not so metaphorically over some of the issues sadly. But as the saying goes, we chose to do this because it is not easy. Something very special was required and generally that means something hard to do. Take the structure first. If you look at the steel you will see a repetition of structural form. We have used double tension tied down prestressed bar trusses at medium scale and then at a huge scale to span 35m with no bracing in the plane of the glass. The shape of the roof lights are tilted cylinders sloping up from the centre and having an oval shape when viewed from above. The glass is SIGU’s using thin Fritted Fully Toughened Glass in the outer. This outer is designed for hail resistance on the basis it breaks the hail and not the other way around! The inner glass is a thicker laminated glass that supports the outer glass on a bubble of insulating gas inside the SIGU’s. As I said the roof lights are very special!” Interior Architecture & Design One of the main factors pertinent to the interiors of 1 Discovery Place is that the design was customised very specifically around the Discovery’s requirements. The developers chose to include Discovery throughout the design process to ensure the building was tailored for them. On that basis, Interior Architects and 32 1 Discovery Place