Who Engineered the New Green Roof on the Sears Tower?

Hello april05,

Please note I have done a "spell check" on some of the words on the piece below, because several words were incorrect.

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Chicago-based Adrian Smith + Gordon Gill Architecture (AS+GG), include:

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These are the, Architects and builders of the New 'Green' Roof' and, are the 65,000 new window panels etc, to 'Sears' now to be renamed 'Willis Tower"

after the Owners.

Chicago's Sears Tower to Receive ''Green'' Retrofit

06/30/2009 CHICAGO, IL --

Chicago's Sears Tower will receive the most significant sustainable modernisation project of an existing building ever undertaken. The project will result in unparalleled energy savings and reduced CO2 emissions to the tallest building in the Western Hemisphere, reducing the base building electricity use by up to 80 percent, which includes a combination of energy savings and co-generation. The energy savings equal 68 million kilowatt hours annually or 150,000 barrels of oil every year. The sustainability plans also drive economic development in the West Loop, creating more than 3,600 jobs, and are part of a broader initiative to transform the global icon.

The building, which already meets Leadership in Energy and Environmental Design (LEED) criteria, will undertake sustainability initiatives above and beyond those used by the United States Green Building Council to rate a green building.

Modernisation strategies, designed by

Chicago-based Adrian Smith + Gordon Gill Architecture (AS+GG), include:

--Efficiency improvements to the building's exterior envelope and windows. The tower has 16,000 single-pane windows. Sustainability plans for the building call for a window replacement and glazing program. Strategies to achieve a thermal break of the curtain wall are also being investigated. These upgrades would achieve savings of up to 50 percent of heating energy.

--Mechanical systems upgrades in the form of new gas boilers that utilize fuel cell technologies, which generate electricity, heating and cooling at as much as 90 percent efficiency. Mechanical upgrades also will include new high-efficiency chillers and upgrades to the distribution system.

--The tower's 104 high speed elevators and 15 escalators that will be modernised with the latest technology to achieve 40 percent reduction in their energy consumption.

--Water savings that will be realized with conservation initiatives through upgrades to restroom fixtures, condensation recovery systems and water efficient landscaping, which will reduce water usage by 40 percent and save 24 million gallons of water each year.

--Lighting that will be upgraded through advanced lighting control systems and daylight harvesting, an advanced lighting control system that automatically dims lights in tenant spaces based on the amount of sunlight entering through the windows. Combined, these upgrades will save up to 40 percent of lighting energy consumption.

--Renewable energy like wind and solar, and technologies like green roofs that will be tested. Wind turbines will be tested to take advantage of the tower's height and unique set-back roof areas. Solar hot-water panels will help heat water for the building. Green roofs that can sustain high- altitude conditions, and that will be among the tallest in the world, will be tested to reduce storm water runoff, improve insulation, help mitigate the urban heat island effect, and provide pleasant vistas for tenants overlooking the areas.

"Buildings are the world's largest contributor to carbon emissions, and therefore the biggest opportunity to address climate change is to retrofit existing structures," said Adrian Smith, partner, AS+GG. "Our goal in the Sears Tower greening project is to create a holistic approach that integrates high-performance building technologies and design strategies for maximum energy efficiency. In the process, we hope to set a benchmark for how high-rise buildings throughout the world can limit their impact on the environment."

"Sustainable architecture in new buildings is important but not enough to address the climate and energy crises facing our world," added Gordon Gill, partner, AS+GG. "We have to apply what we've learned to our existing stock of commercial buildings--especially iconic structures such as Sears Tower, which we hope will inspire similar initiatives around the globe. These will serve as great examples for building owners and managers and can reposition existing building stock to be as competitive as most new buildings or even better."

Developers also plan to create greenspace around the tower's Plazas. A new hotel is also planned.

The cost of construction for the Sears Tower project is estimated at $350 million. A number of private and public financing and funding options are being explored. The majority of the energy savings will be realized in approximately five years and work will start immediately.

For more information on the sustainability plans for the building, please visit: www.searstower.com/icon