Consulting-Specifying Engineer - February 2008 - (Page 42)

Codes & Standards Lighting the way The ANSI/ASHRAE/IESNA Standard 90.1 for energy efficiency evolves with energy-efficient technology for lighting control systems. BY EDDIE HICKERSON, Lighting Control Specialist, Square D/Schneider Electric, Lavergne, Tenn. A AT A GLANCE Of all the engineering disciplines, one can argue that lighting has made the most practical strides in complying with energy efficiency standards. For more information, useful Web sites include the following • Lighting Controls Assn., www.aboutlightingcontrols .com. • The Building Codes Assistance Project, www.bcap-energy .org. • Illumination Engineering Society of North America, www .iesna.org. • For tax deductions, www .lightingtaxdeduction.org. s part of the Energy Policy Act of 1992, the U.S. Dept. of Energy (DOE) established ANSI/ASHRAE/ IESNA 90.1-1989 as the federally mandated minimum design and construction standard for commercial buildings throughout the United States. And with lighting efficiency—a major component of overall building system efficiency—as energy-efficient lighting technologies evolve, the code also evolves. In addition to establishing the new standard, the legislation empowered the DOE to review future updates to ANSI/ASHRAE/IESNA 90.1 (commonly called Standard 90.1), and determine if those updates should be adopted on a federal level. In 2002, the DOE did just that, adopting Standard 90.1-1999 as the new federal standard, and in doing so, set a two-year deadline for all 50 states to adopt commercial energy codes at least as stringent as Standard 90.1-1999. Roughly half of the states adopted the standard by the deadline. To date, 14 states have not adopted energy codes as stringent as Standard 90.1-1999, not including three states that have had significant adoptions of the standard by local jurisdictions within the states. It should be noted that some states use the International Energy Conservation Code (IECC) instead of Standard 90.1, upon which IECC is based. Each year, the two change stringency requirements, so it is difficult to know which to follow. Since that time, two new versions of Standard 90.1 have evolved: ANSI/ASHRAE/ IESNA 90.1-2001 and ANSI/ASHRAE/IESNA 90.1-2004. Understanding these two versions, as well as which of the standards, if any, is being adopted by particular states or local municipalities, is an important responsibility of consulting engineers. Lighting effects A collaborative effort of ASHRAE and the Illuminating Engineering Society of North America (IESNA) members developed Standard 90.1-1999 and later versions set energy standards in three primary areas: • Building envelope • HVAC/water heating • Lighting. According to a report issued by the Lighting Controls Assn., lighting accounts for 50% of electrical energy use in most buildings constructed before 1986. In new buildings that meet Standard 90.1-1999, lighting accounts for only 30% of electrical energy use. Also, according to the Energy Cost Savings Council, energy-efficient lighting generates an average project payback period of 2.2 years and a 45% return on investment, a better payback than other energy-saving building system technologies. This dramatic reduction in overall electric consumption points toward the importance energy-efficient lighting technologies play within the three areas the standard addresses. Many of the standard’s requirements, as they pertain to lighting controls, have gone unchanged in the 2001 and 2004 versions. The biggest differences with regard to lighting concern allowable lighting power density, which has become more stringent in recent versions. For example, within office settings, the limitation on wattage per square foot went from 1.5 W/sq. ft in Standard 90.1-2001 to 1.0 W/sq. ft in Standard 90.1-2004. That change creates a push to seek out higher efficacy lighting in new construction projects. The Energy Policy Act of 2005 was established to further increase the adoption of energy-efficient technologies in existing 42 Consulting-Specifying Engineer FEBRUARY 2008 http://www.aboutlightingcontrols.com http://www.aboutlightingcontrols.com http://www.bcap-energy.org http://www.bcap-energy.org http://www.iesna.org http://www.iesna.org http://www.lightingtaxdeduction.org http://www.lightingtaxdeduction.org

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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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