The Issues:
Visitors to the Natural Capital Center usually find themselves looking upward, drawn by the beam of refreshing sunlight that filters through a large skylight in the building’s atrium. Large windows on all four sides of the building contribute to an open, airy feeling and cut down on the use of artificial light. Markedly absent from most of the former warehouse are banks of fluorescent lights or predominant light fixtures that would flood the building with artificial light. Such careful attention to lighting design - and natural light - was the work of Interface’s lighting design team.
The Solutions:Integrated designThe Jean Vollum Natural Capital Center (Ecotrust Building) stands as a shining example of environmentally sustainable design - without starting from the ground up. As a major part of the design team, Interface provided mechanical and electrical engineering, plumbing and lighting design, and energy modeling for the premiere building in Portland’s revitalized Pearl District. Early consideration of key heating and cooling systems, along with energy modeling, resulted in low-cost/no-cost integrated design solutions that maximized energy efficiency and created win-win scenarios in the award-winning building. Integration blended energy efficiency measures with lighting design, ventilation, and system controls. Net savings were then used to pay for other sustainable design measures.
Energy-efficient design according to LEEDInterface’s charge to design the most energy-efficient systems possible was led by Andy Frichtl, PE, a mechanical engineer with a passion for sustainability. Andy and the Interface team came up with a design that is estimated to be 22 percent more efficient than the 1995 Oregon Energy Code, in effect updating the Ecotrust Building by 100 years without changing its 22-inch thick brick walls. “We did the best possible for an older brick building,” Andy said.
Interface’s design effort includes low-cost/no-cost energy efficiency measures such as occupancy sensors, low e-glazing on windows, daylighting controls, carbon dioxide sensors to control ventilation rates, and a first-rate building automation system to control all the sensors and energy using systems. The project also incorporated operable windows and a wonderfully daylit atrium. This emphasis was instrumental in the building receiving a LEED Gold rating from the U.S. Green Building Council, the first such certification in the western U.S.
The various energy-saving features make the building a great place to work and visit. Security type Micro switches on windows shut down the heating, ventilating, and air conditoning (HVAC) system in favor of natural ventilation when windows are opened, letting nature do the cooling. The variable air volume HVAC system allows the percentage of fresh and recycled air to fluctuate depending on existing conditions, and flushes fresh air through the building when necessary.
The right mix of artificial and natural light
Lasting benefits
The Natural Capital Center represents Ecotrust’s commitment to support businesses and other organizations committed to environmental and economic stability. Building tenants are all using their “natural capital” in the form of knowledge, creativity and ingenuity to promote future prosperity through the responsible, inventive use of natural materials. Both beautiful and inspiring, the building is regarded as a regional and natural model for sustainable design.
