ASHRAE Journal Supplement - AMCA International In Motion - Summer 2014 - (Page 22)
BY WADE SMITH
EXECUTIVE DIRECTOR
AMCA INTERNATIONAL
2012 Fan Market Data
Defines the Path to Higher Efficiency
I
n June of 2011, the U.S. Department of Energy
issued a notice of its intent to regulate the efficiency
of commercial and industrial fans. Given the impact
of the Department of Energy (DOE) fan efficiency rulemaking
and its ripple effects, AMCA International and its members have
been working to develop a consensus of just how regulations,
codes, standards and utility incentives can work to lower the
connected load and operating energy fans consume. To put this
in perspective, AMCA estimates that fans consume between
30% and 40% of commercial HVAC energy, depending on the
system design.
AMCA members have engaged in a vigorous debate, made
difficult by the knowledge that every fan selection can be both
the most efficient choice (under the right conditions) and least
efficient choice (under the wrong conditions). Actual installed
fan efficiency of centrifugal roof ventilators, for example,
varies from 10% to 80% depending on the fan selection (see
Figure 1).
So, regulating fan efficiency without considering application
conditions and fan selection is rife with unintended
consequences.
AMCA ORDER DATABASE
To help inform debate, 20 AMCA members agreed to provide
AMCA staff with confidential order and selection information
for 1.3 million fans sold in 2012. Collectively, this data represents
Connected fan load (BHP)
2500
2000
1500
1000
500
0
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
Fan static efficiency at design operating point (%)
Figure 1. Static efficiency at the selection point for centrifugal power roof vents. Note how spread out the efficiencies are.
22
Summer 2014
A M C A I N T E R N AT I O N A L
inmotion
W W W. A M C A . O R G
http://WWW.AMCA.ORG
Table of Contents for the Digital Edition of ASHRAE Journal Supplement - AMCA International In Motion - Summer 2014
Contents
ASHRAE Journal Supplement - AMCA International In Motion - Summer 2014
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