Cleantech Market Intelligence
Green Buildings Get Capital Vote
While Congress drags its heels on climate change legislation, the District of Columbia has become a leader in green building requirements. The D.C. Green Building Act of 2006 requires that all new private development projects 50,000 SF or larger qualify for the LEED-certified designation. As a result, Washington not only has more LEED-certified buildings than many states, but also has the second-largest number of ENERGY STAR-certified buildings of any city in the United States (Los Angeles is first). As the number of green buildings in the nation’s capital increases, attention is being focused on the actual energy efficiency performance of these buildings.
The Washington Examiner, a local tabloid, provided a shockingly poor analysis of the impact that LEED certification has on buildings in D.C. The report looks at data provided by the district government on energy intensity based on actual utility bills to determine if buildings constructed to LEED standards are more efficient than buildings that are not. The analysis examines the performance of buildings over a set period of time and compares a group of LEED buildings to non-LEED buildings. But buildings are considered to be LEED buildings if construction to meet LEED standards has been completed, is ongoing, or is even just planned as future work. Examining projects such as Ballou High School (estimated completion date: June 2015), Stuart-Hobson Middle School (December 2015), and Lafayette Elementary School (August 2016), the report overlooks the fact that the performance benefits of building to LEED standards are not realized until after construction. Rather than conclude that the buildings with the poor energy performance were chosen to be renovated to meet LEED standards, it concludes, bizarrely, that LEED standards are meaningless.
Though it may be easy to dismiss this analysis outright, it raises an important question about how to ensure that a building’s performance is aligned with its design. During operation, buildings drift toward inefficiency. Periodic commissioning of mechanical, electrical, and plumbing systems can optimize the building’s performance. (This process is described in Navigant Research’s report, Building Optimization and Commissioning Services, from 2012). Indeed, the LEED standard for new construction requires fundamental commissioning of buildings and provides an additional credit for enhanced commissioning. However, commissioning is rarely repeated more than once every 3 to 5 years. The drift in building performance is an opportunity for new approaches to energy savings.
The U.S. Green Building Council (USGBC) is attempting to capitalize on this opportunity through the launch of its dynamic plaque, which provides an ongoing LEED rating to measure and display a building’s rating in close to real time. But a dynamic plaque still needs an operator to diagnose and address changes in performance. The future of well-tuned buildings lies in ongoing commissioning, which automates the process. Solutions available from several building energy management system vendors not only monitor performance, but also detect anomalies and recalibrate the control system to meet ideal parameters. By applying fault detection and diagnostics-based algorithms that track individual control and equipment performance on an ongoing basis, continuous commissioning provides the best opportunity to guarantee that green buildings are energy efficient buildings.