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Fastrack - February 24, 2010


ASHRAE Offers Course on New Green-Building Standard
With the publication of a green-building standard, an updated online seminar reviewing its requirements will be available from the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) on March 15. The seminar will focus on the requirements of ANSI/ASHRAE/USGBC/IES Standard 189.1, Standard for the Design of High-Performance, Green Buildings Except Low-Rise Residential Buildings, and be taught by Tom Lawrence, a member of the committee that developed the standard. [MORE]

AHRI Sponsors HVACR Education/Training Workshop
For more than a decade, the Air-Conditioning, Heating, and Refrigeration Institute (AHRI) has sponsored an annual instructor workshop to enhance the skills and knowledge of HVACR instructors. This year, the 15th Annual Instructor Workshop will be held March 24-26 in Lansdowne, Va. In 2008, AHRI partnered with nine other organizations to host the workshop, which attracted more than 300 attendees and 40 exhibitors. [MORE]

Association of Energy Engineers Accepting Award Nominations
Association of Energy Engineers (AEE) Awards are presented to energy professionals who have achieved international, national, regional, or local prominence in their fields. Candidates for awards may nominate themselves or be nominated by another individual who is an AEE member in good standing, an AEE chapter, or an AEE officer. Entries must be received by April 30. [MORE]

December Heating-and-Cooling-Equipment Shipment Data Released
According to the Air-Conditioning, Heating, and Refrigeration Institute (AHRI), December 2009 brought commercial gas water heaters a 2-percent increase in shipments from 6,182 units in December 2008 to 6,279 units in December 2009. However, shipments of commercial electric water heaters dropped 16 percent to 4,053 units in December 2009, compared with 4,844 units in December 2008. Year-to-date, U.S. shipments of commercial gas water heaters dropped 14.5 percent from 88,265 units in December 2008 to 75,487 units in December 2009. During the same time period, the number of U.S. shipments of commercial electric water heaters decreased 19 percent from 68,686 units in December 2008 to 55,625 units in December 2009. [MORE]

February 24, 2010

Simplifying the Selection of Rooftop Units
By KENNETH M. ELOVITZ, PE, ESQ., Energy Economics Inc., Foxboro, Mass.
An engineer is calculating the cooling load for each room to be served by a new rooftop unit. Solar and transmission heat gains through the windows, walls, and roof and internal heat gains from lights, people (sensible), and equipment add up to the room sensible heat gain (BTUHS). Latent heat gains from people and any process moisture gain (e.g., from a fountain or, in a laboratory, a water bath) add up to the room latent heat gain (BTUHl). With that information, how does the engineer determine the supply-air quantity (in cubic feet per minute) for each room and select a rooftop unit to meet the loads? [MORE]


The Key to Demand Control Ventilation (DCV) Systems that Work
Low efficiency or poor indoor air quality? Which DCV problem do you struggle with? DCV systems typically either over ventilate causing high cost of operation or under ventilate causing poor indoor air quality. Poor indoor air quality negatively affects human comfort and diminishes employees’ performance. Finding a balance between saving energy and maintaining acceptable indoor air quality can be challenging. CO2 measurement technology can make or break efficient operation of your DCV system. Download “CO2 Measurement Technology Essential for DCV Savings” Application Note here.


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