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
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_IOYTBC
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_SGAJJF
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_IGHYER
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_PDRKLS
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2021november
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2021november_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_XCODFR
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_QSLFGO
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_ILKVNM
https://www.nxtbook.com/nxtbooks/ashrae/ashraemexico_2021
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_OPDJKD
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_VJKSRY
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_SDHUTC
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_JPPKRR
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_SDLTTH
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_CKLLES
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_SLDOX
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_HJETUK
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_OLUHGE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2020october
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2020october_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_ZERDGH
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_QVMNEO
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_RTPOKE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_BBATRE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_STUBMW
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_TPEMPE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_JNMKDS
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_FBTTPA
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_WQMMNE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_TVBRYN
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_showguide2020
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_KTUZMA
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_ABEDGD
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201910
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201909
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2019septmeber_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2019september
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201908
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201907
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201906
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201905
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201904
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_2019april
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201903
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_2019march
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201902
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201901
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_showguide2019
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_2018december
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_2018november
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2018fall_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2018fall
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_2018october
https://www.nxtbook.com/nxtbooks/ashrae/ashraemexico_2018
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201810
https://www.nxtbook.com/nxtbooks/ashrae/ashraeinsights_201806
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201805
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201804
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201803
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201712
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201711
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201710
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2017fall_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2017fall
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201709
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201705
https://www.nxtbook.com/nxtbooks/ashrae/ashrae_meetinginsert_201610
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2016fall_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2016fall
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_acrexindia
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2015summer_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2015summer
https://www.nxtbook.com/nxtbooks/amca/2014summer2
https://www.nxtbook.com/nxtbooks/amca/2014summer
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_acma_2014summer
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201311
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201309
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_acmasupp_2013fall
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201305
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201303
https://www.nxtbook.com/nxtbooks/ashrae/pubcatalog_2013winter
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201211
https://www.nxtbook.com/nxtbooks/ashrae/achr_expo_mexico2012
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201209
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201208_v3
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201208_v2
https://www.nxtbook.com/nxtbooks/ashrae/pubcatalog_2012summer
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201205
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201203
https://www.nxtbook.com/nxtbooks/ashrae/pubcatalog_2012winter
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201111_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201109_v2
https://www.nxtbook.com/nxtbooks/ashrae/pubcatalog_2011summer
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201105
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201103
https://www.nxtbookmedia.com