Consulting-Specifying Engineer - November 2008 - (Page 23)

Other installation and start-up, perform17% ing or overseeing functional testing, owner training, and warranty review within 10 months of Mechanical substantial completion. 48% It is difficult to discuss commissioning of lighting controls without some discussion of the Lighting impact of design decisions. Some 35% common errors in the design of lighting controls revolve around scheduling. For interior and exterior areas where operation is based on a schedule, it is worth reviewing all operation times with the owner or building manager. Optimally, all surface luminance Figure 1 The 2006 California Commercial levels and schedules should be captured End-Use Survey breaks down commercial in the owner’s project requirements. It is sector energy use, as show in their online important to verify that the time clock has report (www.energy.ca.gov/ceus). sufficient channels, as some spaces such Source: 2006 California Commercial Endas loading docks may require the lights to Use Survey operate independent of the scheduled time that makes sense for other spaces. sequence of operations that should have When a direct digitally controlled been incorporated into the plans and spec(DDC) lighting control system is specified ifications. This should include testing the for increased flexibility, the design review system in all defined modes of operation, should confirm that the sequence of oper- including proper operation during and ations includes sufficient detail to allow recovery from loss of building power. proper system programming. DDC systems provide greater flexibility than hardwired Occupancy sensors control systems and can be modified easily, Occupancy sensors (OS) are increaseven after installation is complete. How- ingly used in lieu of time clocks to betever, the commissioning effort needs to ter match occupancy patterns. Individual match the level of control sophistication. OS even are installed at workstations to The verification process used should control a single light fixture. Each occube similar to that required for any HVAC pancy sensor should be indicated clearly control system; it confirms that all inputs on the drawings, along with which lights and outputs are functional, that wiring is complete to the end device, and that Editor’s note the end device functions properly. FuncThis article was developed in collaboration tional testing must confirm that system with the Building Commissioning Assn. programming satisfies the fully developed (BCA). For more information about Left: The Renée & Henry Segerstrom Concert Hall in Costa Mesa, Calif., which was honcommissioning, visit ored with an Award of Merit honoree in the category of monumental buildings/public spaces www.bcxa.org. category of the 2008 International Association of Lighting Designers (IALD International Indoor lighting is one of the single largest consumers of energy in nonresidential buildings, representing more than onethird of total electricity used. Recognizing its significant effect on energy consumption, the U.S. Green Building Council included requirements for commissioning lighting, including controls in its LEED rating systems. Other strategic organizations will likely join the call to require commissioning of lighting systems to meet their energy reduction objectives. These organizations include ASHRAE Vision 20/20, Architecture 2030 Challenge, and the Clinton Climate Initiative. Code requirements driving lighting control design include California’s Title 24 multilevel or bilevel switching to decrease lighting power 50% to 70% while maintaining uniformity, and ASHRAE’s 90.12004 automatic shutoff controls for office spaces greater than 5,000 sq ft. Some state and city codes require occupancy sensors and daylight responsive controls. Most codes require time clocks and/or photocells to turn off lights that are used to illuminate building facades, canopies, parking lots, pedestrian walkways, gardens, and other landscaped areas. With LEED’s adoption of the ASHRAE 90.1-2004 energy standard, LEED projects must meet specific lighting control provisions and prescriptive power allowances, and they must include commissioning. Opportunities for the commissioning authority to interact with the design and construction team on lighting include developing the owner’s projects requirements and basis of design documents, reviewing drawings and specifications and equipment submittals, verifying equipment Design Awards, Source: IALD Consulting-Specifying Engineer • NOVEMBER 2008 23 http://www.energy.ca.gov/ceus http://www.bcxa.org

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Consulting-Specifying Engineer - November 2008 Contents Viewpoint News M/E Roundtable Comissioning Lighting Controls Prevent Plugholing: Smoke Control Done Right Commercial Geothermal Heating and Cooling System Design Codes &�Standards Case Study New Products Equipment Lifecycles Advertiser Index Green Space

Consulting-Specifying Engineer - November 2008

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