ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 16
As previously discussed, the relationship between
power and airfl ow dictated by the fan laws provides an
inequitable effi ciency requirement for LDCF. Fan 3 is
representative of a current high-effi ciency LDCF product.
Fan 1 represents a high-airfl ow (for the given diameter)
LDCF with the same cfm/W as Fan 3. Note that, despite
increasing the airfoil effi ciency by 10 percent (no small
task) and the drive effi ciency to 99 percent, the motor would
have to increase its effi ciency by 18 percent for Fan 1 to
comply with the cfm/W requirements. This essentially
makes Fan 1 impossible to manufacture. On the other
hand, Fan 5 represents a low-airfl ow (for the given diameter)
LDCF with the same cfm/W as Fan 3. Note that, even
though both fans have the same cfm/W rating, Fan 5 has a
10-percent-less-effi cient airfoil, a 35-percent-less-effi cient
motor, and a 4-percent-less-effi cient drive. This gives Fan
5 a free pass on effi ciency compliance that leaves a lot of
Airflow vs. Power
2,500
2,000
1,500
1,000
500
50,000 100,000 150,000 200,000 250,000 300,000
Airflow Rate (cfm)
potential energy savings on the table. It should be noted
that Fan 5 would have to be made roughly 27 percent more
effi cient to comply with CFEI requirements at high speed.
CFEI was developed to make ineffi cient fans less likely
to comply through the use of slower speeds, such as
those used to game the cfm/W metric, and to remove the
unintentional barrier to compliance for high-performing
high-utility fans.
For discussion of CFEI and how it came to replace
cfm/W, how to comply with CFEI requirements in the U.S.
Code of Federal Regulations, and how CFEI is refl ected in
AMCA International standards, testing, and certifi cation,
see the full " Introducing Ceiling Fan Energy Index (CFEI)
and Changes to the U.S. Regulation for Large-Diameter
Ceiling Fans " white paper on the AMCA International largediameter-ceiling-fan
microsite at www.amca.org/ldcf.
Fan
Model
Fan #1
Fan #2
Fan #3
Fan #4
Fan #5
Color
CFEI100
(≥ 1.00)
1.72
1.38
1.18
0.85
0.63
DOE
cfm/W
234
234
234
234
234
FIGURE 2. Input power vs. airfl ow at fi ve test speeds for fi ve 24-ft fans with average cfm/W and CFEI at high
speed shown in legend.
Fan model Max. cfm CFEI100 (≥ 1.00) DOE cfm/W Airfoil eff. Trans. eff. Motor eff. Drive eff.
Fan 1
307,395
Fan 2
Fan 3
Fan 4
Fan 5
267,300
243,000
187,110
133,650
1.72
1.38
1.18
0.85
0.63
234
234
234
234
234
57.0%
52.0%
47.0%
42.0%
37.0%
100% 108.0%
100%
100%
100%
100%
95.0%
99.0%
97.0%
90.0% 95.0%
70.0% 93.0%
55.0%
91.0%
TABLE 2. Relative component effi ciencies required to achieve 234 cfm/W at various airfl ows, 24-ft-diameter fan.
16
2021 AMCA inmot ion
www.amca.org
System Input Power (W)
http://www.amca.org/ldcf
http://www.amca.org
ASHRAE Journal Supplement - AMCA InMotion - November 2021
Table of Contents for the Digital Edition of ASHRAE Journal Supplement - AMCA InMotion - November 2021
Contents
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - BB1
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - BB2
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - Cover1
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - Cover2
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - Contents
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 2
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 3
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 4
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 5
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 6
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 7
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 8
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 9
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 10
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 11
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 12
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 13
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 14
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 15
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 16
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 17
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 18
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 19
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 20
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 21
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 22
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 23
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 24
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 25
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 26
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 27
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 28
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 29
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 30
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 31
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 32
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 33
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 34
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 35
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 36
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 37
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 38
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 39
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 40
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 41
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 42
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 43
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 44
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - Cover3
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - Cover4
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