Fan Efficiency Grades--Overcoming Energy Challenges

Fans account for a large amount of the energy consumed in HVAC systems.  According to Michael Ivanovich--director of strategic energy initiatives for the Air Movement Control Association (AMCA) International,  fans account for 80% of the so-called parasitic load--that is HVAC loads other than prime movers like chillers and boilers.

Selecting fans to reduce energy waste has been difficult in the past, as there were no universal fan selection guides and metrics.   In 2007, AMCA international began working to develop a fan efficiency classification system, called the Fan Efficiency Grade (FEG).  It was formalized with the publication of AMCA 205 in 2010

What is a Fan Efficiency Grade

AMCA defines FEG as "a numerical rating that classifies fans by their aerodynamic ability to convert mechanical shaft power, or impeller power in the case of a direct driven fan to air power."  This allows engineers to more easily differentiate between fan models. The higher FEG ratings, the more efficient the fan model. 

Why FEG Matters 

It is important to understand the nature of FEGs, because these efficiency grades, essentially an index of inherent aerodynamic quality, are referenced in last year's international Green Construction Code (IGCC), and the 2013 update of ASHRAE 90.1.

It is likely more will adopt the AMCA fan standards, as AMCA members begin to work with 2015 International Energy Conservation Code (IECC) language and members of the SHARE 189.1 committee.

Reference:

AMCA "Fan Industry-Facing up the Energy Challenges"