AMCA International inmotion Magazine - Summer 2012 - (Page 14)

By Armin HAuer advanced technology manager ebm-papSt Inc., FarmIngton, conn. Joe Brooks, Pe dIrector oF certIFIcatIon programS, amca InternatIonal arlIngton heIghtS, Ill. in the European Market hile the united states is only beginning to regulate fan efficiencies in codes, standards, and federal regulations, the european union (eu) has fan-efficiency regulations taking effect on January 1, 2013. The European approach is based on a metric called Fan Motor Efficiency Grade, and is very different from the direction that America is heading, which is based on a metric called Fan Efficiency Grade. This article outlines the International Standards Organization (ISO) standard that defines fan motor efficiency grades, and briefly describes how the European regulation will be applied in fan selection. Because this topic involves many definitions and calculations, a spreadsheet with sample calculations and other material has been posted online at the AMCA website at www.amca.org/feg/fmeg.aspx. Fan motor efficiency Grades FEG refreshed Several previous articles in AMCA’s inmotion magazine editions have explained and discussed the efficiency classification for fans per ANSI/AMCA Standard 205-12, Energy Efficiency Classification for Fans. AMCA 205 defines Fan Efficiency Grades (FEG) for fans with 5 in. impeller diameters or larger and operating with a shaft power of 1 hp and above. FEG ratings represent the aerodynamic quality of a fan without the impact of the fan motor drive system. The FEG classification uses fan total pressure and consequently the total efficiency. W Fan total efficiency relates to the bare-shaft fan alone and should not be confused with overall efficiency of the complete driven fan assembly. Fan total efficiency is the product of airflow times fan total pressure divided by the fan shaft power requirement. An FEG is determined for the fan’s peak total efficiency point (ηpk). The FEG bands embrace increasing fan total efficiency values with increasing impeller diameters. (Visit www.amca.org/feg/best-practices.aspx for previous technical articles on AMCA 205, FEGs, and Figure 1: Power flow through a fan assembly and associated losses. fan total efficiency.) Fan shaft power Motor output power Fan aerodynamic loss Fan bearing loss Input power Motor controls Motor Mechanical drive Fan Air power Control losses Motor losses Drive losses Fan acoustic loss AMCA Standard 205 is harmonized with Section 6.2 Bare Shaft Fans of ISO standard 12759:2010, Fans—Efficiency classification for fans. ISO uses the term bare-shaft fans to distinguish those from complete fan assemblies that include electric motors and, as applicable, mechanical drive systems or variable speed drives (VSDs). The remainder of ISO 12759 is devoted to Fan Motor Efficiency Grades (FMEG). w w w. a m c a . o r g 14 Summer 2012 a m c a I n t e r nat I o na l inmotion http://www.amca.org/feg/fmeg.aspx http://www.amca.org/feg/best-practices.aspx http://WWW.AMCA.ORG

Table of Contents for the Digital Edition of AMCA International inmotion Magazine - Summer 2012

AMCA International inmotion Magazine - Summer 2012
President’s Message
Contents
From the Executive Director
Code Watch
News
The Role of Fan Efficiency in Achieving Energy Reduction Goals
Fan Motor Efficiency Grades in the European Market
Performance and Reliability Assurance of Custom Engineered and Manufactured Fans for Industrial and Utility Applications
Smoke Damper Testing and Maintenance for Service Life and Performance Assurance
Calendar
Advertisers Index

AMCA International inmotion Magazine - Summer 2012

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