AMCA International inmotion Magazine - Fall 2011 - (Page 9)

Product Rating Manual for Fan Air Performance, describes the certification process for rating a fan for FEG. For the European Union, where fans are often packaged with integral motors, ISO Standard 12759-2010, Efficiency classification for fans, defines fan-motor efficiency grades (FMEG). Note that these two grades are not equivalent and in no circumstances should FEG and FMEG be used simultaneously to evaluate fan performance. What are FEGs used for? FEG ratings are used by code authorities or by specifying engineers to define a minimum requirement for energy efficiency of a fan for a given application. The specifications can use a singlevalue FEG for each application. The use of a single number is possible because the shapes of the FEG bands closely follow the actual peak efficiencies for typical fan designs (Figure 2). Smaller fans are typically less efficient 90 80 70 60 50 40 30 20 FEG 85 FEG 80 FEG 75 FEG 71 FEG 67 FEG 63 FEG 60 FEG 56 FEG 53 FEG 50 How are FEG ratings calculated? FEGs are based on peak total efficiency for a given fan size. The FEG is established by plotting the peak total efficiency at the appropriate impeller diameter, then reading the associated FEG band in which this point falls. For example, a fan with an impeller diameter of 15 in. and a peak total efficiency of 71% would have an FEG of 80 (Figure 3). Peak total efficiency, pTE (%) Figure 3: FEG band area for FEG80. Annex A to AMCA 205-10 provides equations for the upper and lower boundaries of each fan efficiency grade, as well as a table of peak fan total efficiency versus fan size that can be used to calculate the FEG. Engineers and other practitioners, however, will not have to calculate FEGs; they will find them in manufacturers’ literature and software as they become available. AMCA-certified FEG ratings for fans will be identified in search results from the AMCA certified product database at www.amca.org/certified. Which fan types and sizes are covered, and which ones are not? AMCA 205 and AMCA 211 have slight differences with respect to minimum fan sizes, and there are a few other differences as well, as shown in Table 1. AMCA 205 is currently being revised, after which it will be harmonized with AMCA 211. When codes and standards set FEG requirements, they will specify FEG ratings, fan sizes, and exclusions. For example, ASHRAE 90.1 is using FEG67 as its minimum FEG rating, and for fans above 5 hp; and there are a number of exclusions beyond those named in AMCA 211. inmotion FA L L 2 0 1 1 0 5 10 15 20 25 30 Impeller Diameter (in) 35 40 45 Figure 2: FEGs for various fan efficiencies and sizes. than larger fans for a given fan type, and this trend is reflected in the shape of the efficiency bands. Rather than making individual fan selections to determine a minimum efficiency target for each duty point, the specifying engineer can simply establish a minimum FEG for the application (i.e., FEG71 for all supply fans, FEG67 for all exhaust fans, etc.). Minimum FEGs can also be adopted by energy codes and standards, such as ANSI/ASHRAE/ IES 90.1, Energy Standard for Buildings Except Low-Rise Residential Buildings, and the International Code Council’s International Green Construction Code (IGCC). W W W. A M C A . O R G A M C A I N T E R N AT I O N A L 9 http://www.amca.org/certified http://WWW.AMCA.ORG

Table of Contents for the Digital Edition of AMCA International inmotion Magazine - Fall 2011

AMCA International inmotion Magazine - Fall 2011
President’s Message
News
Code Watch
Fan Efficiency Grades: Answers to Frequently Asked Questions
Fans and Atrium Smoke Control
Fire Dampers and Smoke Dampers: The Difference is Important
Fan and Damper Guide Specs Update
Calendar

AMCA International inmotion Magazine - Fall 2011

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