[Code of Federal Regulations]
[Title 10, Volume 3]
[Revised as of January 1, 2006]
From the U.S. Government Printing Office via GPO Access
[CITE: 10CFR431.17]
[Page 392-394]
TITLE 10--ENERGY
CHAPTER II--DEPARTMENT OF ENERGY
PART 431_ENERGY EFFICIENCY PROGRAM FOR CERTAIN COMMERCIAL AND INDUSTRIAL
EQUIPMENT--Table of Contents
Subpart B_Electric Motors
Sec. 431.17 Determination of efficiency.
When a party determines the energy efficiency of an electric motor
in order to comply with an obligation imposed on it by or pursuant to
Part C of Title III of EPCA, 42 U.S.C. 6311-6316, this Section applies.
This section does not apply to enforcement testing conducted pursuant to
Sec. 431.192.
(a) Provisions applicable to all electric motors--(1) General
requirements. The average full load efficiency of each basic model of
electric motor must be determined either by testing in accordance with
Sec. 431.16 of this subpart, or by application of an alternative
efficiency determination method (AEDM) that meets the requirements of
paragraphs (a)(2) and (3) of this section, provided, however, that an
AEDM may be used to determine the average full load efficiency of one or
more of a manufacturer's basic models only if the average full load
efficiency of at least five of its other basic models is determined
through testing.
(2) Alternative efficiency determination method. An AEDM applied to
a basic model must be:
(i) Derived from a mathematical model that represents the mechanical
and electrical characteristics of that basic model, and
(ii) Based on engineering or statistical analysis, computer
simulation or modeling, or other analytic evaluation of performance
data.
[[Page 393]]
(3) Substantiation of an alternative efficiency determination
method. Before an AEDM is used, its accuracy and reliability must be
substantiated as follows:
(i) The AEDM must be applied to at least five basic models that have
been tested in accordance with Sec. 431.16, and
(ii) The predicted total power loss for each such basic model,
calculated by applying the AEDM, must be within plus or minus ten
percent of the mean total power loss determined from the testing of that
basic model.
(4) Subsequent verification of an AEDM. (i) Each manufacturer shall
periodically select basic models representative of those to which it has
applied an AEDM, and for each basic model selected shall either:
(A) Subject a sample of units to testing in accordance with Sec.
Sec. 431.16 and 431.17(b)(2) by an accredited laboratory that meets the
requirements of Sec. 431.18;
(B) Have a certification body recognized under Sec. 431.20 certify
its nominal full load efficiency; or
(C) Have an independent state-registered professional engineer, who
is qualified to perform an evaluation of electric motor efficiency in a
highly competent manner and who is not an employee of the manufacturer,
review the manufacturer's representations and certify that the results
of the AEDM accurately represent the total power loss and nominal full
load efficiency of the basic model.
(ii) Each manufacturer that has used an AEDM under this section
shall have available for inspection by the Department of Energy records
showing: the method or methods used; the mathematical model, the
engineering or statistical analysis, computer simulation or modeling,
and other analytic evaluation of performance data on which the AEDM is
based; complete test data, product information, and related information
that the manufacturer has generated or acquired pursuant to paragraphs
(a)(3) and (a)(4)(i) of this section; and the calculations used to
determine the average full load efficiency and total power losses of
each basic model to which the AEDM was applied.
(iii) If requested by the Department, the manufacturer shall conduct
simulations to predict the performance of particular basic models of
electric motors specified by the Department, analyses of previous
simulations conducted by the manufacturer, sample testing of basic
models selected by the Department, or a combination of the foregoing.
(5) Use of a certification program or accredited laboratory. (i) A
manufacturer may have a certification program, that DOE has classified
as nationally recognized under Sec. 431.20, certify the nominal full
load efficiency of a basic model of electric motor, and issue a
certificate of conformity for the motor.
(ii) For each basic model for which a certification program is not
used as described in paragraph (a)(5)(i) of this section, any testing of
the motor pursuant to paragraphs (a)(1) through (3) of this section to
determine its energy efficiency must be carried out in accordance with
paragraph (b) of this section, in an accredited laboratory that meets
the requirements of Sec. 431.18. (This includes testing of the basic
model, pursuant to paragraph (a)(3)(i) of this section, to substantiate
an AEDM.)
(b) Additional testing requirements applicable when a certification
program is not used--(1) Selection of basic models for testing. (i)
Basic models must be selected for testing in accordance with the
following criteria:
(A) Two of the basic models must be among the five basic models with
the highest unit volumes of production by the manufacturer in the prior
year, or during the prior 12 calendar month period beginning in 1997,\1\
whichever is later;
---------------------------------------------------------------------------
\1\ In identifying thse five basic models, any electric motor that
does not comply with Sec. 431.25 shall be excluded from consideration.
---------------------------------------------------------------------------
(B) The basic models should be of different horsepowers without
duplication;
(C) The basic models should be of different frame number series
without duplication; and
(D) Each basic model should be expected to have the lowest nominal
full load efficiency among the basic models with the same rating
(``rating'' as used here has the same meaning as it has in the
definition of ``basic model'').
[[Page 394]]
(ii) In any instance where it is impossible for a manufacturer to
select basic models for testing in accordance with all of these
criteria, the criteria shall be given priority in the order in which
they are listed. Within the limits imposed by the criteria, basic models
shall be selected randomly.
(2) Selection of units for testing. For each basic model selected
for testing,\2\ a sample of units shall be selected at random and
tested. The sample shall be comprised of production units of the basic
model, or units that are representative of such production units. The
sample size shall be not fewer than five units, except that when fewer
than five units of a basic model would be produced over a reasonable
period of time (approximately 180 days), then each unit shall be tested.
In a test of compliance with a represented average or nominal
efficiency:
---------------------------------------------------------------------------
\2\ Components of similar design may be substituted without
requiring additional testing if the represented measures of energy
consumption continue to satisfy the applicable sampling provision.
---------------------------------------------------------------------------
(i) The average full-load efficiency of the sample X which is
defined by
[GRAPHIC] [TIFF OMITTED] TR83AD04.001
where Xi is the measured full-load efficiency of unit i and n is the
number of units tested, shall satisfy the condition:
[GRAPHIC] [TIFF OMITTED] TR83AD04.002
where RE is the represented nominal full-load efficiency, and
(ii) The lowest full-load efficiency in the sample Xmin,
which is defined by
[GRAPHIC] [TIFF OMITTED] TR83AD04.003
shall satisfy the condition
[GRAPHIC] [TIFF OMITTED] TR83AD04.004
(3) Substantiation of an alternative efficiency determination
method. The basic models tested under Sec. 431.17(a)(3)(i) must be
selected for testing in accordance with paragraph (b)(1) of this
section, and units of each such basic model must be tested in accordance
with paragraph (b)(2) of this section by an accredited laboratory that
meets the requirements of Sec. 431.18.