Palo Alto, California
Stanford University’s Central Energy Facility has a lot of serious technology, but much of it is presented in the lively hues more typical of a children’s museum. Doubling as a teaching tool, the low-slung building showcases the university’s innovative new heating and cooling system with ample glazing and equipment painted in vibrant shades, like orange and aqua, so that visitors can clearly see which parts carry hot water and which ones cold. At night, the bright red surface of a hot-water storage tank is lit so it glows like a giant ember at the heart of the complex.
“We worked to make architecture out of something that, at first glance, didn’t have a lot of potential,” says ZGF principal Toby Hasselgren. “Stanford has an obligation to be efficient and sustainable in its operations, but it also has a mission to educate. Why not do both?” adds Joe Collins, partner at ZGF.
In 2009, the school began considering alternatives to its aging gas-fired power plant. An earlier technology for conserving energy, its cogeneration plant generated electricity and used the by-product heat to warm its buildings. However, a careful analysis revealed that yet more efficiencies could be gained. During much of the year, the campus needed nearly as much heating as it did cooling (since incoming air had to be cooled first to remove humidity and then reheated to comfortable temperatures, particularly at night). This meant that excess heat discharged during evaporative cooling could be reused, instead of lost to the atmosphere. So the school designed an extensive heat-recovery loop, which they say is the first such system on this scale. Reducing the campus’s total energy use by a third, the nearly $500 million system includes a 22-mile network of pipes and three giant holding tanks for hot and cold water. (The university also switched to an off-site solar farm as its primary source of energy.)
Of course, the tanks, related machinery, and offices could have been housed in a nondescript facility. But, given the radical switch in energy use that the project represented, campus architect David Lenox saw the benefit in highlighting it rather than hiding it from view. ZGF, which had previously designed a stem-cell research building at Stanford, was hired to create an appropriately outward-facing design.
On the nearly three-acre site, the architects designed a surprisingly grand complex of buildings organized around the water tanks. The Central Energy Facility faces the main campus to the east and is aligned with its grid. Its centerpiece is the hot-water tank, nearly 70 feet in diameter and protected by a 64-foot-tall screen whose stainless steel and aluminum perforated panels shimmer in the sun. Meanwhile, the two larger cold-water tanks have been lowered 25 feet below grade to reduce their visual impact.
The two main volumes that house the heat-recovery equipment are simple steelframed structures with cast-in-place concrete walls, integrally colored as a nod to the university’s historic sandstone buildings. A welcoming canopy of solar panels, supported by steel pipe columns, unifies the front and wraps around the corner. To the northeast is a two-story, 10,000-squarefoot L-shaped building for staff and visitors. On its ground level, a large conference room, which often serves as the starting point for tours of the facility, doubles as an extra classroom. A courtyard offers another prime spot to congregate, with its bleacher seating looking out onto the hot-water tank. At the top of this stair, a spacious breezeway provides a protected outdoor space for small gatherings and leads to the offices for the 16-person staff, in a narrow, 25-footwide bar with daylight flooding through its glass curtain walls.
The architects’ creative material palette lends the complex a visual richness. The “people” building is clad in weathering steel, a nod to the site’s former agrarian life. The use of maple on the soffits, as well as the cross-laminated timber underpinning the solar panels, provides a warmth and subtly suggests that this is a safe place to be, with no threat of combustible gases. Finegrained metal screening adds a sense of lightness. The two larger cold-water tanks are delicately masked by perforated box-ribbed aluminum, while the courtyard is shielded from the sun by a trellis topped with steel grating. “Power plants are typically the worst part of a campus—they’re ugly and smelly,” says Joe Stagner, executive director of Stanford’s department of sustainability and energy management. “When people come here, they are immediately disarmed. As with the rest of campus, the investment in architecture has helped to make a good impression; it helps to open minds and excite the imagination.”
ZGF Architects LLP
1223 SW Washington Street, Suite 200
Portland, Oregon 97205
Personnel in architect’s firm who should receive special credit:
Joseph Collins, partner in charge, FAIA, LEED AP BD+C
Toby Hasselgren, senior designer, AIA
Renee Kajimoto, project architect, AIA, LEED AP
Design Team: Bradley Iest, Glen Justice, Curtis Williams, Sienna Hill, Christopher Flint Chatto, Kelvin Ono, Michael McGale, Nicholas Robertson
Interior designer: ZGF Architects LLP
Prime Contractor/ Lead MEP Engineer: Affiliated Engineers, Inc.
Structural Engineer: Rutherford & Chekene
Civil Engineer: BKF Engineers
Landscape: Tom Leader Studio
Lighting: Affiliated Engineers, Inc.
Acoustical: Colin Gordon Associates, Inc.
General contractor: The Whiting-Turner Contracting Company
Courtesy of ZGF Architects, LLP; © Robert Canfield
Courtesy of ZGF Architects, LLP; © Tim Griffith
Courtesy of ZGF Architects, LLP; © Matthew Anderson
Courtesy of ZGF Architects, LLP; © Steve Proehl, Proehl Studios
Size: 125,600 square feet (gross)
Project cost: $485 million
Construction cost: $120 million
Completion date: March 2015
Concrete, steel frame, cross-laminated timber
Manufacturer of any structural components unique to this project: Structurlam Products Ltd. (cross-laminated timber)
Metal Panels: Morin Corp., Metal Sales
Metal/glass curtain wall: Walters & Wolf
Rainscreen (terra cotta, composite, etc.): Morin Corp., Metal Sales
Precast concrete: N/A
Wood: Geometrix, TerraMai, Stucturlam Products Ltd (cross-laminated timber)
Moisture barrier: Henry Manufacturing, Inc.
Curtain wall: Walters & Wolf
Built-up roofing: N/A
Elastomeric: Firestone (Thermoplastic polyolefin roofing)
Metal frame: Walters & Wolf (Curtain wall)
Entrances: Walters & Wolf
Metal doors: Walters & Wolf
Sliding doors: Raumplus North America
Special doors (sound control, X-ray, etc.): Olsen Steel, Crown Industrial Supply Inc.
Locksets: Schlage, Accurate
Exit devices: Von Duprin
Security devices: Von Duprin, Schlage, LCN
Acoustical ceilings: Armstrong
Suspension grid: Armstrong
Demountable partitions: Modernfold, Inc.
Cabinetwork and custom woodwork: Imperial Woodworking
Paints and stains: Sherwin Williams, Benjamin-Moore, TNEMEC
Wall coverings: Forbo (Tackboard panels)
Paneling: Terramai, Imperial Woodworking
Plastic laminate: Formica
Solid surfacing: Corian
Floor and wall tile (cite where used): Royal Mosa (restrooms and work areas)
Carpet: Bentley Mills
Special interior finishes unique to this project: Reclaimed wood (Terramai)
Office furniture: Knoll
Reception furniture: Knoll
Chairs: Source, Office Master, Hightower Group, Knoll, Keilhauer
Tables: KI, WCI, Inc.
Upholstery: Source, Knoll
Other furniture: Humanscale, Workrite Ergonomics
Interior ambient lighting: Lumenpulse, OCL Architectural Lighting
Exterior: Gardco Lighting, Luxrail, Selux, Ecosense Lighting
Dimming System or other lighting controls: nLight
Sloan, Zurn Products, Kohler
Energy management or building automation system: Johnson Controls
Other unique products that contribute to sustainability:
Radiant flooring, operable windows, fans, phase change material in ceiling
Additional building components or special equipment that made a significant contribution to this project:
Thermal Storage Tanks (Pacific Tank)