ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 3

By RONALD WROBLEWSKI, PE, Productive Energy Solutions LLC;
JEFF BOLDT, PE, HBDP, LEED AP, FASHRAE, FPE, IMEG Corp.;
and MICHAEL IVANOVICH, AMCA International

F

ans are unique from other appliances in that their operating
efficiency varies significantly based on how they are applied and

where within their operating envelope they are selected. Application
and selection, therefore, are far more influential than peak efficiency in
determining the actual energy consumption of a fan. Unlike, for example,
an incandescent light bulb, a fan that is the least efficient for one application may be the most efficient for another.
In June 2011, the U.S. Department of Energy (DOE) initiated a rulemaking
for commercial and industrial fans and blowers. At the time, fan efficiency
grade (FEG) was the established metric for fan-efficiency provisions in model
energy codes and standards. In February 2013, however, the DOE released
a rulemaking framework indicating a preference for a metric based on
electrical power consumption, a departure from FEG. AMCA International
and its members then went about developing a new fan-efficiency metric,
fan energy index (FEI), for use in the expected federal regulation.1 Although
fi nalization of that regulation has been postponed, FEI is making its way
into model energy codes and standards. Most recently, in June 2019,
ASHRAE's board of directors approved the publication of Addendum ao to
ANSI/ASHRAE/IES 90.1-2016, Energy Standard for Buildings Except Low-Rise
Residential Buildings, which replaces FEG language with FEI language.
A wire-to-air metric formalized in ANSI/AMCA Standard 208-18,
Calculation of the Fan Energy Index, FEI is calculated using data collected
during manufacturers' rating tests and considers efficiency losses associated
with the fan impeller, motor, and drive. It establishes a baseline efficiency
and resulting baseline power that varies with both airflow and pressure and
can be applied to all fan categories. For energy-efficiency regulations, codes,

Throughout 2019, AMCA is
making ANSI/AMCA Standard
208-18, Calculation of the
Fan Energy Index
Index,, available
for download at no cost in its
online store at http://bit.ly/
AMCA_208.

and standards, this establishes a "range of compliant operations," rather than
a single-point pass/fail efficiency threshold.
For designers of variable-air-volume (VAV) systems, FEI is a useful metric
for fan sizing and selection, indicating whether a fan will operate at or below
required power levels. The question is on what operating point should FEI
ratings be based.
In short, for a VAV system, always select a fan with an FEI rating that is
acceptable at the peak-flow operating condition. Normally, this will ensure
the fan also will be in compliance when it serves a load below peak flow
because slowing a fan's rotational speed generally increases its FEI rating.
This article explains why.

w w w. a m c a .o r g

20 19 A M CA i n m o t i o n

3


http://www.bit.ly/AMCA_208 http://www.bit.ly/AMCA_208 http://www.amca.org

ASHRAE Journal Supplement - AMCA InMotion - September 2019

Table of Contents for the Digital Edition of ASHRAE Journal Supplement - AMCA InMotion - September 2019

Contents
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - BB1
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - BB2
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - Cover1
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - Cover2
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - Contents
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 2
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 3
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 4
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 5
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 6
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 7
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 8
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 9
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 10
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 11
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 12
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 13
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 14
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 15
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 16
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 17
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 18
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 19
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 20
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 21
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 22
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 23
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 24
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 25
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 26
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 27
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 28
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 29
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 30
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 31
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 32
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 33
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 34
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 35
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 36
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 37
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 38
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 39
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 40
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 41
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 42
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 43
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - 44
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - Cover3
ASHRAE Journal Supplement - AMCA InMotion - September 2019 - Cover4
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