ASHRAE Journal - January 2013 - 66

emerging technologies
Montessori School located in Florida in a climate with extreme cooling requirements, provides an example. The school’s new HVAC system included an air-to-air ERV system with an energy recovery wheel. Since the school opened in 2009, the cooling cost reduction realized (relative to an HVAC system without energy recovery) is 70%. Further, by reducing the outdoor air load on the HVAC system, the ERV wheel allowed downsizing of the HVAC equipment, saving $25,000 in first cost. The ongoing savings estimate is about $12,000 per year, $6,000 from the downsized HVAC unit and $6,000 Table 1: Energy recovery requirement (ASHRAE Standard 90.1-2010). from energy recovery.2 Integration of ERV with other energy savings technology, Minimal first cost and minimal operating cost were key drive.g., chilled beams, is expected to qualify the Transit Operations ers for the architect’s selection of the HVAC systems for the Facility in Raleigh, N.C. for LEED Platinum certification.3 The Eddy Village Green skilled nursing facility in Cohoes, N.Y. facility in its entirety, including administration, maintenance The nursing facility is configured as a cluster of 16 ranch-style and other operations, exceeds 90,000 ft2 (8400 m2). Given the homes, 8,400 ft2 (780 m2) each, with HVAC systems operatsize of the facility and the large open doors to accommodate ing with outdoor air ventilation 24/7/365.4 Integrated energy bus traffic, dual-wheel energy recovery, in tandem with chilled recovery wheels were chosen as the most efficient alternative. beams, was chosen as the most cost effective way to achieve the For each of the residences, a 13-ton (46 kW) HVAC unit was state’s mandate of “30% better than” ASHRAE Standard 90.1 used instead of an 18-ton (63 kW) unit without ERV. This while meeting outdoor air requirements. Actual energy costs downsizing resulted in a net savings of more than $1,200 per of the new retrofit building have averaged 65% less than the unit, or about $20,000 for all 16 units. The ongoing energy costs before the installation of the energy savings measures. savings resulting from energy recovery is estimated to be more

Revised Edition Promotes Device “Interoperability”
ANSI/ASHRAE Standard 135-2010, BACnet – A Data Communication Protocol for Building Automation and Control Networks, allows building equipment and systems manufactured by different companies to work together. It is the only open, consensus-developed standard in the building controls industry. Visit AsHRAE BookstoRE At AHR Expo

New in this revised edition:

• Higher speeds for MS/TP networks and wiring guidance for optically isolated segments • New requirements for workstations and the definition of new kinds of workstations • New engineering units to support smart grid and other emerging applications • A new Global Group object for gathering, monitoring and distributing sets of data • 6 new objects to support physical access control • 12 new objects to support the full complement of all data types, including strings
Price: $170 (ASHRA E Member: $140)

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To order, visit the ASHRAE Online Store at www.ashrae.org/135-2010
66 ASHRAE Journal January 2013
ASHRAE Journal - January 2013

Table of Contents for the Digital Edition of ASHRAE Journal - January 2013
