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Federal Register / Vol. 86, No. 193 / Friday, October 8, 2021 / Rules and Regulations
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TABLE III.3WATER EXTRACTION RESULTS FROM EXTRACTOR INVESTIGATIONContinued Extractor test
% IMC
no spray bottle used
Test load
3

55.25

Yes.

Standard 3

54.20
53.63

Yes.
No.

Standard-Size Test Load Range

53.155.3

Appendix D1 Range

54.061.0

4
5

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Within range defined by appendix D1?

5
6

Compact 1

57.51
56.77

Yes.
Yes.

7
8

Compact 2

56.81
57.51

Yes.
Yes.

Compact-Size Test Load Range

56.857.5

Appendix D1 Range

54.061.0

For all but two test loads, the extractor produced an IMC within the range of 54.0 to 61.0 percent, as specified in appendix D1; however, two standard-size test loads had IMCs less than 54 percent the minimum of the range defined in appendix D1. These results confirm that despite the wider range of target IMC values defined in appendix D1 compared to those in appendix D2, the extractor can sometimes lead to an IMC value lower than the target IMC range in appendix D1. Without the moisture content adjustments provided by use of a spray bottle as specified in appendix D2, the previous language of appendix D1
suggests that test loads prepared under appendix D1 may require re-wetting and re-spinning.
As summarized, DOE is amending appendix D1 to allow the use of a spray bottle as necessary following the extractor run to achieve the required IMC range. This will provide a reliable, validated, and burden-reducing approach to fine-tune IMC values that fall just below the target range, such as those seen in DOEs extractor investigation. This additional direction provides a means to achieve allowable IMC without the need to re-wet and respin the test load if the IMC achieved by the extractor is below the target range of IMC.
DOE is not specifying the temperature of the spray bottle water given the amount of time and air exposure that the test load encounters while being spun in the extractor, sprayed, and loaded into the clothes dryer. According to DOE investigative testing, the moisture content provided by the spray bottle is approximately 0.03 percentage points with each spray, up to a maximum of 5.33 percentage points that
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may be added in the load under appendix D2 to achieve the specified moisture content of the test load of 57.5
0.33 percent. Recognizing that without such specification, the temperature of water in the spray bottle could be closer to room temperature i.e., only slightly higher than AHAMs suggestion of 60 F, it is implausible that the temperature of the water in the spray bottle would change the temperature of the load enough to impact the dryer performance.
In summary, DOE is aligning appendix D1 with appendix D2 by specifically providing for the use of a spray bottle to add water to test loads that are below the acceptable IMC range minimum of 54.0 percent following the extractor run. DOE is not adding a temperature specification for the spray bottle water.
ii. Final Moisture Content Section 3.3.1 of appendix D2 specifies that for timer clothes dryers, the test load is dried until the FMC is between 1 and 2.5 percent of the bone-dry weight of the test load. The measured energy consumption is then normalized to determine the energy consumption required to dry the test load to 2-percent FMC, with a field use factor applied to account for the over-drying energy consumption, in section 4.1 of appendix D2. For automatic termination control clothes dryers, section 3.3.2 of appendix D2 specifies that a test is considered valid if the FMC of the test load is 2
percent or less. DOE did not propose amending the FMC requirement of appendix D2 in the July 2019 NOPR.
The California IOUs stated that the 2percent FMC under the DOE test conditions is appropriate, though suggested that a higher FMC may be
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appropriate when accounting for additional test conditions, such as changes in clothes dryer settings or a more realistic clothes dryer load. In the absence of any changes to these settings or test load, the California IOUs recommended maintaining the current 2-percent FMC. California IOUs, No. 29
at p. 20
Samsung, AHAM, BSH, and GEA
commented that requiring an FMC of 2
percent or less promotes over-drying and unnecessary additional energy use;
and further, because clothes that are over-dried will typically re-absorb moisture from ambient air during cooldown phases of the drying cycle and after termination of the drying cycle, a higher FMC, between 5 percent and 8
percent, results. Samsung suggested a 4percent FMC requirement, corresponding to estimated moisture uptake from bone-dry conditions on the 100 percent cotton IEC test load. AHAM
and GEA suggested that DOE adopt an FMC range of 3 to 4 percent, with a target of 4 percent. AHAM, No. 33 at pp. 5, 12; BSH, No. 30 at pp. 12, 4;
GEA, No. 37 at p. 2; Samsung, No. 36
at p. 2
BSH and AHAM also referenced the December 2015 Underwriters Laboratory UL clothes dryer safety requirement in UL 2158, North American Dryer Safety Standard that the requirement of a cool-down period if the temperature at the clothes dryers lint filter exceeds 131 F 55 C at the end of the drying cycle as a source of difficulty for ventless condensing clothes dryers in meeting the current 2-percent FMC
requirement in appendix D2.29 BSH
commented that due to the drying 29 UL 2158 can be accessed at https standards catalog.ul.com/standards/en/standard_2158_4.

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