On zero-energy cities: The idea of a zero-energy city is a subject I’ve been interested in most of my career, working in indigenous areas like Guatemala and the Middle East, looking for clues about the design of buildings in their cultural and historical fabric. For the last four years, we’ve been looking at how to relate buildings to the natural forces that are available to us—geothermal, wind, solar, building orientation, and so on.
Sears Tower as guidepost: In 2005, while Gordon Gill and I were still at SOM, we started to look at the need to not only reduce buildings’ reliance on energy, but also to absorb the energy and use the latent environment to its greatest advantage. The Sears Tower [now Willis Tower] has 10,000 panes of single-glaze glass, and each creates as much carbon as one SUV. So we looked into completely replacing the exterior wall, redoing the insulation panels, updating the mechanical systems, reducing the amount of artificial light in the inner space, using dimmer systems, greening the nine roofs, using solar provide hot water, and so on. The potential savings would be 68 million kWh a year, which translates to five million fewer miles of driving, or electricity for 2,500 homes. We concluded that we could save 80% of the base energy of the building and 50% of the tenant energy use for the building.
Decarbonizing Chicago: The Sears Tower got us thinking about the 2030 Challenge, the BOMA 7-Point Challenge, and the Chicago Climate Action Plan: What would happen if we analyzed Chicago’s Loop to meet those goals? Over the last year, our firm has conducted an extensive study, a Chicago Central Area Decarbonization Plan, to see what it would take to get a carbon-free environment by 2030. We looked at a 460-acre section of the Loop that represents 9% of the city’s emissions, 3.9 million tons of CO2e a year, to see how to get an 80% reduction by 2020 and eliminate 3.2 million tons of CO2e a year.
By taking every building in the study area, all 550, and applying what we did in the Sears Tower, you get about one-third of the way toward the 2030 Challenge. Then, if you change the “urban matrix” of the buildings in the Loop from essentially 100% office use to 50% office and 50% residential, that gets you two-thirds of the way there. And through means like smart infrastructure, increased pedestrian traffic, district cooling, reducing energy in water and waste, and community education—when you do all that, you still have about 20% of the way to go, and that 20% has to come from renewable power sources to achieve a total reduction of carbon.
New technology, new philosophy: The old technology, old philosophy is having a central power plant and transmitting the power from the central plant to each building in the city. The problem is that you’re only 40-50% efficient at the source, and you’re losing 30% more in transmission, so you’re throwing away 70-80% of the power. Using new technology with wind and solar farms still relies on transmitting energy to the city. The new technology, new philosophy is to make as much power on the site as possible. Then you can shave the peak period for all users and reduce the total number of power plants. And you don’t need the grid: every building becomes a power source.
QUESTIONS FROM THE IIT AUDIENCE
Does your plan use projections of future improvements in technology?
ADS: The Chicago decarbonization plan uses existing technology; we don’t rely on technology that doesn’t exist. As people hear about what we’re doing, new technology will become part of our daily lives. We don’t know if some of those things will work, so you can’t rely on unknown technology in the future.
What about the embodied energy of materials?
ADS: The best way you can save energy is to take something old and renew it. You have to tackle it building by building, district by district. The study showed that for $65 a square foot you could bring these buildings up to state of the art, vs. $250 a square foot to replace them.
How will you store energy for when it’s actually needed?
ADS: You have to have storage facilities to store that power, whether that’s a battery or limestone caves. This is a key area of investigation, and it’s going to take a clever solution to do this on an economical basis.
How likely is it that your plan could be implemented?
ADS: That’s a big question mark. In New York City, building owners have to do some of the things we’re talking about. This is a seed. You throw it out there.
Would the residential units be too expensive for low-income groups?
ADS: In the Loop, retrofitting the pre-1950s buildings could give you opportunity to do that, where units would be cost accessible. In the ’80s, we took a lot of abandoned manufacturing buildings and converted them into residential lofts that were quite affordable.
How do you counteract the public’s reaction to high density?
ADS: People don’t want their views blocked, and that’s where a master plan comes in, and zoning densities. Wacker’s “Manual of the Plan of Chicago” was used for 15 years after the Burnham Plan of 1909, to teach every public school student what the plan meant. We’re proposing a similar manual that creates strategies for a carbon-free environment.
Related Stories
| Jul 8, 2013
RSMeans cost comparisons: offices, daycare centers, convenience stores, fast food
Construction market analysts from RSMeans offer construction costs per square foot for offices, daycare centers, convenience stores, fast food.
| Jul 8, 2013
RSMeans cost comparisons: hotels, motels, and apartment buildings
Construction market analysts from RSMeans offer construction costs per square foot for hotels, motels, and apartment buildings.
| Jul 8, 2013
Learn from the world’s fastest animal: speed isn’t everything
Every schoolchild knows that the cheetah is the world’s fastest land animal—70 mph, no sweat. And, as we all know from National Geographic television documentaries, it is speed that makes Acinonyx jubatus such a fearsome hunter, right?
| Jul 3, 2013
Mid-year special: Top 13 stories for 2013 (so far)
Every six months, we like to take a look back at the stories that generated the most interest from our readers. Here's a roundup of the top 13 articles on BDCnetwork.com for the first six months of 2013.
| Jul 3, 2013
World's biggest freestanding building opens in China
Measuring a stout 100 meters high, 500 meters long, and 400 meters wide, the New Century Global Centre in the Tianfu New District of Chengdu, China, is officially the world's largest freestanding building.
| Jul 3, 2013
Mall of America will double in size after $2.5 billion expansion
The nation's largest indoor mall will undergo a $2.5 billion, 10-year expansion project that will add attractions like an NHL-sized skating rink and an indoor water park.
| Jul 3, 2013
Architects team with HUD to promote 'Rebuild By Design' competition for Hurricane Sandy recovery effort
The American Institute of Architects (AIA) today announced a communications campaign urging its membership to enter the “Rebuild by Design” multi-stage regional design competition announced by Department of Housing and Urban Development (HUD) Secretary Shaun Donovan on June 20.
| Jul 2, 2013
LEED v4 gets green light, will launch this fall
The U.S. Green Building Council membership has voted to adopt LEED v4, the next update to the world’s premier green building rating system.
| Jul 1, 2013
Firestone Building Products Company LLC Announces Sustainability Report
Firestone Building Products Company, LLC, the leading manufacturer of superior “Roots to Rooftops” products for commercial building performance solutions, today announced the release of its 2012 Sustainability Report. The report, the first for Firestone Building Products Company, covers the fiscal 2012 year and is available for download at firestonebpco.com.
| Jul 1, 2013
LEGOLAND builds 12-foot replica of One World Trade Center
The LEGOLAND Discovery Center Westchester in Yonkers, N.Y., celebrated the completion of a LEGO replica of One World Trade Center by lighting the 12-foot-tall, 100-pound model.