VOLTTRON

FLEXLAB's Lighting and Plug Load Testbed provides a realistic occupied office environment

The Challenge: Ensuring Lighting Controls Are Worth the Investment

It is well documented that controls that automatically adjust lighting as needed save energy and money. Scheduling alone could save the commercial building sector tens of trillions of Btus and billions of dollars in energy costs each year. But 70 percent of commercial buildings don’t use any controls. Building owners and operators remain unconvinced of their value. And they don’t know how to make sure lighting control systems are working properly – or delivering the savings they promise.

The Solution: FLEXLAB®

With funding from the Department of Energy Building Technologies Office, Berkeley Lab researchers devised an experiment to show that open-source algorithms can provide the tools needed to monitor a building’s lighting control systems, make sure they’re performing as they should, and quantify a given building’s energy savings. They developed open-source algorithms to conduct fault detection and diagnostics (FDD) and continuous savings measurement and verification (M&V) for lighting control systems. FLEXLAB’s Lighting and Plug Load Testbed provided a realistic, occupied office environment that also features the ability to configure diverse control strategies and physical control zones.

Occupant sensors in the Lighting and Plug Load Testbed

The Bottom Line

FLEXLAB® showed building stakeholders that lighting controls can be continuously monitored to ensure energy- and cost-saving benefits. The experiment focused on schedule-based lighting controls, which can save five to 15 percent of lighting energy use compared to a no-controls baseline. Automating lighting based on expected times of building occupancy saves energy. Occupant sensors and/or override switches can ensure flexibility. The experiment proved that automated measurement and verification can show building owners and operators exactly how much energy lighting controls are saving them – and can do it automatically, on an ongoing basis. The experiment showed that open-source algorithms for FDD and M&V can reliably tell when a lighting-control system isn’t working as it should, giving building owners and operators clear guidance for making adjustments and enabling even greater energy savings. These algorithms can be readily adopted for inclusion in existing commercial lighting control solutions, or can be implemented using the Department of Energy’s open-source VOLTTRON™ platform.

Download the full case study here: VOLTTRON

Matchless Flexibility
"The configurability of physical control zones and lighting control strategies that FLEXLAB® offers is unparalleled. The work we conducted in FLEXLAB is a test facility that offers critical benefits beyond the typical environments that we otherwise have access to in our field."