Consulting-Specifying Engineer - February 2008 - (Page 43)

compliant space controls include: • An occupancy sensor that turns lighting on and off with occupancy in offices, restrooms, conference Designing to a modern energy standard rooms, employee lunch rooms, achieves energy savings, but it may not and classrooms. meet the needs of building tenants. • A switch to override the schedule for as long as 4 hours time of day schedule control, occupancy during the off schedule, for lighting on sensing, and signal from other systems a time-of-day schedule control. indicating space is unoccupied. Excep• Multi-scene controls in classrooms tions are given for buildings with light- or conference rooms, which was feaing intended for a 24-hour operation, tured in ASHRAE 90.1-2004. lighting in spaces where patient care is rendered, and places where safety The big picture would be compromised. While it’s important for engineers to Also left unchanged from Stan- be mindful of energy codes and standard 90.1-1999 are space control dards in their respective states, this requirements, which stipulate that should not be the only consideration each enclosed space by ceiling-height when specifying lighting controls in a partitions shall have at least one space commercial building. While designing control device to control an area up to to a modern energy standard achieves 2,500 sq. ft for spaces 10,000 sq. ft or less, energy savings, it may not meet the or an area up to 10,000 sq. ft for spaces needs of those using the building. Dimgreater than 10,000 sq. ft. Examples of ming controls in offices, multi-scene buildings by establishing tax incentives. The Energy Efficient Commercial Buildings Deduction allows as much as $1.80/sq. ft tax deduction for energy-efficient building systems, but no amount higher than the cost of the system, for buildings designed for 50% energy cost savings relative to a building designed within the scope of Standard 90.1-2001. As an alternative to considering the efficiency of the whole building, the tax law also allows businesses to individually measure the efficiency of each of the three building systems considered in the standard. Each of these areas may qualify for up to a $0.60/sq. ft deduction for its contribution to the 50% savings. While Standard 90.1-2004 has seen less application in federal law or the U.S. tax code, its initial focus served as a minimum requirement to qualify for the USGBC LEED certification program. Left largely unchanged in the 2001 and 2004 versions of Standard 90.1 is the requirement for automatic lighting shutoff in commercial buildings larger than 5,000 sq. ft. The standard provides three methods for automatic lighting shutoff: An important responsibility of consulting engineers tasked with lighting control projects in commercial buildings is to understand the 2001 and 2004 versions of ANSI/ASHRAE/IESNA 90.1 as well as which standards, if any, have been adopted by their states or local municipalities. controls in classrooms and conference rooms, and conveniently located keypads are a few ways that lighting controls make the building more functional and convenient for occupants. But before employing a specific lighting control strategy, take the time to speak with suppliers who offer a wide breadth of lighting control options to verify how such a strategy will mesh with other energy saving initiatives that are employed. It will be time well spent and a key cog in achieving both functionality and energy and cost savings. Eddie Hickerson is responsible for energy code and lighting control training for Square D/Schneider Electric, as well as developing and administering support tools. With 20 years of experience in the lighting industry, Hickerson has served the lighting ballast design industry and as a product manager of fluorescent lamps and ballasts. Consulting-Specifying Engineer • FEBRUARY 2008 Photo: Square D/Schneider Electric 43

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Consulting-Specifying Engineer - February 2008 Contents Viewpoint News M/E Roundtable How To Write Control Sequences Mentoring Engineers: Myths, Motivations, and Models Keep Young Electrical Engineers Grounded Protecting a Vulnerable Population Codes & Standards Case Study New Products Equipment Lifecycles Advertisers Index Green Space

Consulting-Specifying Engineer - February 2008

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