Building Automation: Building Automation
At this year’s AHR show in Chicago, we had the opportunity to conduct a full-day seminar on Advanced Integrated Lighting Control. While this is the fourth year that we have held an educational seminar at this event, it is the first time that we have focused exclusively on lighting control. So why would we want to talk about lighting control at an HVAC event? The answer was provided many times over by the industry leaders who presented. Here are some interesting facts:
- Buildings are the largest single consumers of energy in North America, accounting for almost 40% of the total energy usage, and this is fairly evenly split between residential and commercial buildings.
- Within buildings, HVAC use accounts for approximately 40% of the energy, while lighting is a close second, using 28%.
- Lighting contributes to the cooling load of the building, so lowering lighting energy use results in a reduction of cooling energy use.
- New codes and standards now have requirements for some form of lighting control.
- Like HVAC, lighting has a significant impact on occupant comfort and productivity.
Ideally, the lighting control system would still be able to be designed and delivered as part of the electrical system, but a part that can be readily integrated to the BAS. Systems are now available that offer the ability to integrate using a variety of open protocols, including XML, BACnet®, Modbus, and LonTalk®. Designing a system to be integrated requires careful coordination between the BAS / integration design and the lighting control design. This coordination extends through installation, commissioning, and operations.
Some of the common functions of an integrated lighting control system include:
- Coordinated scheduling of lights and HVAC loads. While this seems simplistic, it has a giant potential for energy savings.
- Control and monitoring of advanced lighting control functions such as daylight harvesting. The ability to take advantage of natural light from windows and skylights has a tremendous potential to both save energy and improve occupant comfort. Monitoring this through the BAS allows for improved tuning to get the most out of this often underutilized application.
- Lighting control provides for effective and inexpensive occupancy sensing. Information on occupancy from the lighting system can be readily used for scheduling and control in the BAS.
- For projects that are enrolled in a demand response program, the ability to shed lighting load provides an effective solution with little occupant impact.
- New technologies with communicating ballasts offer the potential to gain valuable maintenance information including notification to replace bulbs.
Sidebar: Lighting on the WebThere are a number of excellent resources for information on lighting control. These include:
- Lighting Controls Association: www.aboutlightingcontrols.org
- Case study on the New York Times building project: http://windows.lbl.gov/comm_perf/nyt_overview.html