Adrian Smith and Gordon Gill Architecture (AS+GG) has won an international world competition to design the Wuhan Greenland Center. At 606 meters (1,988 ft) high, the building is expected to be China’s third tallest and the world’s fourth tallest when construction is due to be completed in 2016. The tower will feature a number of sustainable elements, the most visibly obvious of which is the tower’s streamlined form with softly rounded corners and a tapered body that culminates in a distinctive domed top.
Water conservation features include low-flow plumbing fixtures that are designed to not only cut water usage, but also reduce the amount energy needed to pump the water around the building. A grey water recovery system will also be used to take wastewater from the building’s hotel laundry, sinks and showers for reuse in the building’s evaporative cooling system.
The tower’s aerodynamic shape, which sees its three corners rising from a tripod-shaped base and tapering upwards to culminate in an arched tip above the dome at the top, is designed to reduce wind resistance and the vortex action that builds up around super-tall towers. AS+GG says this will allow the amount of structural material and its associated embodied carbon to be minimized. The curtain wall cladding the body of the tower will enclose a composite concrete core with steel framing and will contrast with the corners of the building, which will be made of smooth curved glass.
To further reduce wind pressure against the tower, there are also apertures placed at regular intervals in the curtain wall. As well as letting the wind through, these vents will also house air intake and exhaust systems on mechanical floors – and provide an out of view place to hide window-washing systems. The ventilation systems will also include rotary air-to-air enthalpy wheels – also known as thermal wheels – to capture energy from the building’s exhaust systems and use it to pre-heat or pre-cool air entering the building.
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