HVAC Breaking News

Dec. 2, 2013: New Software Tackles Building Efficiency, Occupant Comfort

Facility Managers Can Diagnose and Adjust for Problems Based on Direct Occupant Feedback

WASHINGTON — A new software application created by the U.S. Department of Energy’s (DOE’s) National Renewable Energy Laboratory (NREL) could improve the efficiency of commercial buildings by allowing occupants to interact with buildings more directly.

The new Building Agent (BA) application allows facility managers to quickly diagnose and adjust for problems based on direct occupant comfort feedback. Occupants are able to share this feedback via the application dashboard on their desktop computers. With 25 percent of a building’s energy performance directly related to occupant behavior, said NREL, this capability can result in a significant step toward helping buildings become more cost effective and energy efficient.

“This goes beyond the kinds of energy dashboards that facility managers might be familiar with,” said Larry Brackney, NREL senior engineer. “By integrating comfort feedback with traditional measurements, BA ties the notions of comfort and energy performance together in a way that no other application has done. Building occupants become an active part of the comfort and energy tradeoff along with the facility managers.”

In addition, the application provides aggregated data on electric energy, thermal energy, internal temperatures, humidity, and lighting levels.

The BA tool has four key layers: hardware, databases, visualizations, and applications. Based on both modeled and measured data, BA provides intuitive visualizations of energy use and comfort, which are critical for establishing building performance relative to expectations. These capabilities help facility managers and occupants understand the overall comfort and energy performance for an entire building. By presenting data in context to what the building or system should be doing at any given time, BA provides facility managers with the information needed to locate problems and make knowledge-based decisions quickly for improved building performance.

As a research tool, BA provides a better understanding of the occupant acceptance of energy efficiency measures and how typical design practices need to be improved to produce low-energy buildings. The application is already in use in several buildings on the NREL campus and a version of BA is deployed at the Marine Corps Air Station in Miramar, Calif., to conduct an electrochromic window comfort assessment. Electrochromic windows tint automatically to reduce solar heat gain, which can eliminate the need for window shades and potentially reduce cooling load.

“The feedback we get from BA will help to evaluate acceptance of the technology and fine tune control sequences,” said Jennifer Scheib, NREL engineer. “This information will be important going forward as energy efficiency features are considered for the design of new facilities as well as in office building retrofits.”

For more information on NREL’s Building Agent application, visit www.nrel.gov/buildings/commercial.html.

Publication date: 12/2/2013

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