[Code of Federal Regulations]
[Title 10, Volume 3]
[Revised as of January 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 10CFR431.132]
[Page 338-344]
TITLE 10--ENERGY
CHAPTER II--DEPARTMENT OF ENERGY
PART 431_ENERGY EFFICIENCY PROGRAM FOR CERTAIN COMMERCIAL AND INDUSTRIAL
EQUIPMENT--Table of Contents
Subpart G_Certification and Enforcement
Sec. 431.132 Confidentiality.
Pursuant to the provisions of 10 CFR 1004.11, any person submitting
information or data which the person believes to be confidential and
exempt from public disclosure should submit one complete copy, and
fifteen copies from which the information believed to be confidential
has been deleted. In accordance with the procedures established at 10
CFR 1004.11, the Department shall make its own determination with regard
to any claim that information submitted be exempt from public
disclosure.
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Appendix B to Subpart G of Part 431--Sampling Plan for Enforcement
Testing
Step 1. The first sample size (n1) must be five or more
units.
Step 2. Compute the mean (X1) of the measured energy
performance of the n1 units in the first sample as follows:
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where Xi is the measured full-load efficiency of unit i.
Step 3. Compute the sample standard deviation (S1) of the
measured full-load efficiency of the n1, units in the first
sample as follows:
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Step 4. Compute the standard error (SE(X1)) of the mean full-
load efficiency of the first sample as follows:
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Step 5. Compute the lower control limit (LCL1) for the mean
of the first sample using RE as the desired mean as follows:
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where:
RE is the applicable EPCA nominal full-load efficiency when the test is
to determine compliance with the applicable statutory standard, or is
the labeled nominal full-load efficiency when the test is to determine
compliance with the labeled efficiency value, and
t is the 2.5th percentile of a t-distribution for a sample size of
n1, which yields a 97.5 percent confidence level for a one-
tailed t-test.
Step 6. Compare the mean of the first sample (X1) with the
lower control limit (LCL1) to determine one of the following:
(i) If the mean of the first sample is below the lower control
limit, then the basic model is in non-compliance and testing is at an
end.
(ii) If the mean is equal to or greater than the lower control
limit, no final determination of compliance or non-compliance can be
made; proceed to Step 7.
Step 7. Determine the recommended sample size (n) as follows:
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where S1, RE and t have the values used in Steps 3 and 5,
respectively. The factor
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is based on a 20 percent tolerance in the total power loss at full-load
and fixed output power.
Given the value of n, determine one of the following:
(i) If the value of n is less than or equal to n1 and if the
mean energy efficiency of the first sample (X1) is equal to
or greater
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than the lower control limit (LCL1), the basic model is in
compliance and testing is at an end.
(ii) If the value of n is greater than n1, the basic model
is in non-compliance. The size of a second sample n2 is
determined to be the smallest integer equal to or greater than the
difference n-n1. If the value of n2 so calculated
is greater than 20-n1, set n2 equal to 20-
n1.
Step 8. Compute the combined mean (X2) of the measured energy
performance of the n1 and n2 units of the combined
first and second samples as follows:
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Step 9. Compute the standard error (SE(X2)) of the mean full-
load efficiency of the n1 and n2 units in the
combined first and second samples as follows:
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(Note that S1 is the value obtained above in Step 3.)
Step 10. Set the lower control limit (LCL2) to,
[GRAPHIC] [TIFF OMITTED] TR05OC99.021
where t has the value obtained in Step 5, and compare the combined
sample mean (X2) to the lower control limit (LCL2)
to find one of the following:
(i) If the mean of the combined sample (X2) is less than the
lower control limit (LCL2), the basic model is in non-
compliance and testing is at an end.
(ii) If the mean of the combined sample (X2) is equal to or
greater than the lower control limit (LCL2), the basic model
is in compliance and testing is at an end.
Manufacturer-Option Testing
If a determination of non-compliance is made in Steps 6, 7 or 10,
above, the manufacturer may request that additional testing be
conducted, in accordance with the following procedures.
Step A. The manufacturer requests that an additional number,
n3, of units be tested, with n3 chosen such that
n1 + n2 + n3 does not exceed 20.
Step B. Compute the mean full-load efficiency, standard error, and lower
control limit of the new combined sample in accordance with the
procedures prescribed in Steps 8, 9, and 10, above.
Step C. Compare the mean performance of the new combined sample to the
lower control limit (LCL2) to determine one of the following:
(a) If the new combined sample mean is equal to or greater than the
lower control limit, the basic model is in compliance and testing is at
an end.
(b) If the new combined sample mean is less than the lower control
limit and the value of n1 + n2 + n3 is
less than 20, the manufacturer may request that additional units be
tested. The total of all units tested may not exceed 20. Steps A, B, and
C are then repeated.
(c) Otherwise, the basic model is determined to be in non-compliance.