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Federal Register / Vol. 86, No. 11 / Tuesday, January 19, 2021 / Rules and Regulations
main motor applications were selected as representative applications compressors, fans, pumps, material handling, and others. In order to characterize the distributions of SEMs across applications in the industrial sector, DOE used data from hundreds of field assessments aggregated in two databases: 1 A database of motor nameplate and field data and; 25 2 a database of motor nameplate and field data compiled by the Industrial Assessment Center at Oregon University field assessment data.26 For the commercial and residential sectors, DOE
used data from a previous DOE
publication to estimate distribution of SEMs by application.27 DOE also assumed that 20 percent of consumers had space-constraints and 80 percent were non-space-constrained based on data from the March 2010 Final Rule. In response to the April 2020 NOPD, NEMA commented that the inputs used to characterize the distributions of consumers across sectors and applications were appropriate. NEMA, No. 22 at p. 3 DOE used the same consumer sample as in the April 2020
NOPD for this final determination.
See Chapter 7 of the TSD for more details on the resulting distribution of consumers by sector and applications.
2. Motor Input Power DOE used the same approach as in the April 2020 NOPD and calculated the motor input power as the sum of the motor rated horsepower multiplied by
the motor operating load i.e., the motor output power and of the losses at the operating load i.e., part-load losses.
DOE determined the part-load losses using outputs from the engineering analysis full-load efficiency at each efficiency level and published part-load efficiency information from manufacturer catalogs to model motor part-load losses as a function of the motors operating load. DOE estimated the operating load using operating load data specific to motors in the 0.253 hp range, which was based on additional field assessments data collected since the publication of the March 2010 Final Rule.28
In response to the April 2020 NOPD, NEMA commented that an upcoming publication from DOEs Advanced Manufacturing Office Motor System Market Assessment may provide additional information regarding load.
NEMA, No. 22 at p. 4 DOE is aware of this upcoming report but notes that it is not yet available. Accordingly, DOE
used the same load distributions as in the April 2020 NOPD for this final determination.
See chapter 7 of the TSD for the resulting distribution of load for each application.
3. Annual Operating Hours DOE used the same approach as in the April 2020 NOPD and DOE developed distributions of operating hours by application and sector. For the industrial sector, DOE used data specific to motors in the 0.253 hp range from
the field assessment data to establish distributions of annual operating hours by application.29 For the commercial and residential sectors, DOE used operating hours data from the March 2010 Final Rule.30 In response to the April 2020 NOPD, NEMA commented in support of the annual operating hours values used in the NOPD. NEMA
commented that if DOE were to consider standards for a different scope, these assumptions would no longer be adequate. NEMA, No. 22 at p. 4 As discussed previously, DOE is not modifying the scope of the energy conservation standards for SEMs.
Accordingly, DOE used the same operating hour distributions as in the April 2020 NOPD for this final determination. Table IV8 shows the estimated average annual energy use at each efficiency level analyzed.
The annual energy use values are calculated as an intermediate result in the LCC and PBP analysis. As further discussed section IV.F, the computer model DOE uses to calculate the LCC
and PBP relies on a Monte Carlo simulation to incorporate uncertainty and variability into the analysis.
Although the energy use calculation performed in preparation of this final rule relied on the same probability distributions as used in the April 2020
NOPD, each Monte Carlo simulation run randomly samples input values from the probability distributions and consumer samples, which resulted in updated annual energy use results.

TABLE IV8SMALL ELECTRIC MOTORS ANNUAL ENERGY USE RESULTS
Kilowatt-hours per year Rep. Unit
khammond on DSKJM1Z7X2PROD with RULES

1
2 3
4

Description Single-phase, CSCR, 4-pole, 0.75 hp
Polyphase, 4-pole, 1 hp
Single-phase, CSCR, 4-pole, 1 hp
Polyphase, 4-pole, 0.5 hp

EL 0

EL 1

EL 2

EL 3

1,653.6
2,092.8
2,191.9
1,152.6

1,628.2
2,047.7
2,159.1
1,117.9

1,598.5
2,020.8
2,122.7
1,096.7

1,583.8
1,983.8
2,103.9
1,068.1

See Chapter 7 of the TSD for more details on the distributions of annual operating hours by application and sector.

F. Life-Cycle Cost and Payback Period Analysis
25 Database of motor nameplate and field measurement data compiled by the Washington State University Extension Energy Program WSU
and Applied Proactive Technologies APT under contract with the New York State Energy Research and Development Authority NYSERDA.
26 Strategic Energy Group January 2008, Northwest Industrial Motor Database Summary.
Regional Technical Forum. Available at http
rtf.nwcouncil.org/subcommittees/osumotor/
Default.htm.

27 W. Goetzler, T. Sutherland, C. Reis. Energy Savings Potential and Opportunities for HighEfficiency Electric Motors in Residential and Commercial Equipment U.S. Department of Energy, December 4, 2013. Available at https
energy.gov/sites/prod/files/2014/02/f8/Motor %20Energy%20Savings%20Potential%20Report %202013-12-4.pdf.
28 This horsepower range was selected as it corresponds to the motor horsepower of small electric motors that are currently subject to standards see section IV.A.1.

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DOE conducted LCC and PBP
analyses to evaluate the economic impacts on individual consumers of
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EL 4

EL 5

1,536.0
2,043.2

1,509.0
2,008.0

potential energy conservation standards for SEMs. The effect of new or amended energy conservation standards on individual consumers usually involves a reduction in operating cost and an increase in purchase price. DOE used 29 Database of motor nameplate and field measurement data compiled by the Washington State University Extension Energy Program WSU
and Applied Proactive Technologies APT under contract with the New York State Energy Research and Development Authority NYSERDA.
30 For more details see chapter 6 of the 2010 small electric motors final rule TSD, at https
www.regulations.gov/document?D=EERE-2007-BTSTD-0007-0036.

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