AMCA International inmotion Magazine - Fall 2011 - (Page 10)

STANDARD YEAR MIN. SIZE 1/6 hp (125 W) 1 hp (750 W) MAX. SIZE MIN. ANNUAL ENERGY 1,000 kWh None EXCLUSIONS* Table 1: Differences in AMCA FEG standards 205-2010 and 211-2011. *Exclusions are listed in the Certified Ratings Program in AMCA 211 because their primary purpose is not to move air, there is no standardized method to determine their fan total efficiency, or their primary function is life safety. AMCA 205 AMCA 211 2010 2011 None None None (this will change) Air curtains; induced flow fans; energy recovery ventilators (heat recovery ventilators); positive pressure ventilators The IGCC is considering FEG71 as a minimum threshold for fans at or above 1 hp. The IGCC, which is a “reach code” adopted by organizations looking for “beyond code” building energy performance, is scheduled to release Version 1 of the code in 2012. The IGCC requirement is proposed for the prescriptive section of the code, which is applicable for buildings up to 25,000 sq ft. For the most up-to-date information on AMCA 205 revisions and matching to 211, visit www.amca.org/feg. How do I consider FEG ratings in my projects when sizing, selecting, and specifying fans? What about fan systems, that is, fans with motors and drives? Once an engineer has narrowed the list of available fans to only those that meet the minimum FEG rating as specified, the focus should be on actual power consumed. Since FEG ratings are a measure of peak fan energy efficiency and not actual operating efficiency, their main value is in differentiating between different fan types. For a given duty (flow rate and pressure), several fan types and multiple fan sizes may be considered. When making fan selections, the list of available fans is first checked to ensure they meet the minimum FEG requirement. This means they must meet the required peak total efficiency but also must be selected within 10 percentage points of this peak. After that, the refined list of fans is compared using first cost and operating cost, and any other parameters, such as sound, physical size, and so forth. The actual fan input power becomes the basis for the operating cost used in a payback, ROI, or other economic analysis that can be used to compare annual and lifecycle costs for different fan types and sizes: From Table 2, note that eight fans are physically capable of the performance required, and each of these fans happens to have the same FEG rating. The smallest three fans are not selected within 10 percentage points of the peak efficiency. These fans would operate near the bottom of their fan pressure curves; therefore, they would not meet Standard 205 and would not be considered for this duty. The remaining fans sizes, which range TABLE 2 PRESENTS AN EXAMPLE OF FAN SELECTIONS USING FEG AND PEAK TOTAL EFFICIENCY RATINGS. Table 2: Fan selection example using single-width, single-inlet (SWSI) fans with ducted outlet and 10,000 cfm at 3-in. Pt. *Total efficiency for these selections is not within 10% of peak efficiency. FAN SIZE (in.) FAN SPEED (rpm) FAN CLASS FAN POWER (bhp) ACTUAL STATICEFFICIENCY ACTUAL TOTAL EFFICIENCY PEAK TOTAL EFFICIENCY INLET LwA FEG 18 20 22 24 27 30 33 36 10 FA L L 2 0 1 1 3238 2561 1983 1579 1289 1033 887 778 III II II I I I I I 11.8 9.56 8.02 6.84 6.24 5.73 5.67 6.01 18% 30% 44% 57% 67% 76% 79% 76% 40% 49% 59% 69% 76% 82% 83% 79% inmotion 78% 78% 79% 79% 79% 83% 83% 83% 85* 85* 85* 85 85 85 85 85 103 100 96 90 88 84 84 83 A M C A I N T E R N AT I O N A L W W W. A M C A . O R G http://www.amca.org/feg 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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