CHICAGO--Sears Tower has announced plans for a significant sustainable modernization project.
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 Stated Green Building Council to rate a green building. Modernization 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 modernized 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. 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.
As part of the modernization program, Sears Tower's plazas and retail spaces will also undergo changes. A new park at Wacker Drive and Adams Street will be an inviting public space with landscaping and seating. The Adams Street granite wall will be replaced with an interactive digital display, glass storefronts, and trees, which will be planted to form a landscaped terrace that will add a natural filter for carbon dioxide.
The reduction in energy use and CO2 emissions realized through the sustainability and modernization plans for the tower also brings economic opportunities by creating more than 3,600 jobs. Extending its impact beyond the site itself, the project will feature a dynamic Sustainable Technology Learning Center that is designed to help building visitors and Chicago tourists learn about ways to save energy and money, as Sears Tower serves as a laboratory that demonstrates to the office building industry how a sustainability program can be accomplished.
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.
Sears Tower
www.searstower.com
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