Ashrae Journal - November 2008 - B33

the system included calibration checks with NIST-traceable devices, a review of loop tuning, alarms, and interlocks, as well as trend verification. Results As Xerox brought its buildings and systems online, energy conservation opportunities were discovered, based on data being collected. The single largest project was the demand control ventilation project, which instead of bringing in fixed minimum percentages of outside air, allowed the reduction of outside air ventilation as long as the carbon dioxide levels within the facility were monitored. As Xerox collected data, it became clear that it could establish new demand control strategies with a setpoint of 25% to 50% outside air and few to no occupants, significantly reducing the required outside air and enabling the campus staff to calculate energy conservation and cost reduction opportunities. The original purpose of installing the DDC was to integrate the existing control systems without any enhancements. Based upon the energy cost reduction forecast and building modeling, Xerox management moved forward with the implementation and expansion of the DDC system into the demand control ventilation project. The result of that project was payback in less than two years. Xerox also identified a compressor project in a campus building as another opportunity to reap the benefits of integration. During the engineering phase, Xerox installed three new 500 hp (370 kW) air compressors in the building. A communications package was added to the compressors, as well as supplemental metering for compressed air production monitoring. At the completion of the project, all of the operating data from the compressors—including real-time operating efficiency, real-time output, real-time compressed air production, storage and consumption—could be monitored and trended on a continuous basis through the BACnet BAS. This enables Xerox to determine if there are compressor performance problems or impending failures, as well as meter the amount of compressed air usage for the high-pressure and low-pressure process consumption. By integrating different equipment into one BACnet-based system and centralizing building operations, Xerox now has unprecedented control over its entire campus. The programming now in place—demand control ventilation, occupied/unoccupied, load shedding and optimum start—has enabled Xerox to supply heating and cooling only when occupied areas require it, and to cycle down its operations when areas are unoccupied or unused. So far, the system has resulted in substantial energy and cost savings. A Friend in LEED® is a Friend Indeed! Investing just 2% more in LEED®-compliant construction can save ten times that amount over the life of the building. On top of that, studies indicate that workers are healthier, happier and more producv e in LEED®-compliant buildings. And helping your customers with their bottom lines helps you with yours. Get the tools you need for the design, construction and operation of high-performance buildings and save 30% in the process: • ANSI/ASHRAE/IESNA Standard 90.1-2004, Energy Standard for Buildings Except Low-Rise Residential Buildings (I-P edition) • 90.1-2004 User’s Manual • ANSI/ASHRAE Standard 62.1-2004, Venla tion for Acceptable Indoor Air Quality • 62.1-2004 User’s Manual • ANSI/ASHRAE Standard 55-2004, Thermal Environmental Conditions for Human Occupancy • Advanced Energy Design Guide for Small Oﬃce Buildings • Advanced Energy Design Guide for Small Retail Buildings • Advanced Energy Design Guide for K–12 School Buildings • Procedures for Commercial Building Energy Audits Individually, these tools total $609.00 (ASHRAE Members: $526.00). Buy the whole set for just $426.00 (ASHRAE Members: $368.00). ASHRAE Tools for LEED® v2.2: Product Code B86999 NOTE: LEED® v2.2 refers speciﬁcally to the publications shown above. However, Standard 90.1-2007, Standard 62.1-2007 and their associated User’s Manuals are also available and may be ordered separately. PRICES SUBJECT TO CHANGE WITHOUT NOTICE. ORDER AT WWW.ASHRAE.ORG/BOOKSTORE OR CALL TOLL FREE, 1-800-527-4723 (U.S. /CANADA) OR 404-636-8400 (WORLDWIDE) www.info.hotims.com/16019-101 November 2008 B A C n e t ® To d a y | A S u p p l e m e n t t o A S H R A E J o u r n a l B33

Ashrae Journal - November 2008

Table of Contents for the Digital Edition of Ashrae Journal - November 2008