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khammond on DSKJM1Z7X2PROD with PROPOSALS3

Federal Register / Vol. 86, No. 127 / Wednesday, July 7, 2021 / Proposed Rules such, DOE has initially determined, supported by clear and convincing evidence, that in the absence of a definition of non-standard low-static motor, the industry test procedure would not meet the statutory requirements of 42 U.S.C. 6314a2
3.
DOE understands that a non-standard low-static fan motor may be used for DDXDOASes where the application requires less ductwork, which results in a lower external static pressure when operating at the same nominal supply or return airflow rate. This motor would be distributed in commerce as part of an individual model within the same basic model of DDXDOAS that is also distributed in commerce with a motor that can meet the external static pressure required by AHRI 9202020. A
parallel situation occurs for Commercial and Industrial Unitary Air-conditioning and Heat Pump Equipment, for which section D3 in Appendix D of AHRI Test Standard 340/3602019, Performance Rating of Commercial and Industrial Unitary Air-conditioning and Heat Pump Equipment AHRI 340/360
2019 defines non-standard motor as an indoor fan motor that is not the standard indoor fan motor and that is distributed in commerce as part of an individual model within the same Basic Model. The same section D3 defines standard indoor fan motor as the motor specified by the manufacturer for testing and shall be distributed in commerce as part of a particular model.
In both cases, the non-standard motor has a horsepower level that is not compatible with the external static pressure rating conditionfor DDX
DOAS, the issue arises when the nonstandard motor does not have sufficient power to deliver the required external static pressure. Therefore, in the proposed Appendix B in section 2.2.1ai, DOE is proposing to define non-standard low-static fan motor as a supply fan motor that cannot maintain external static pressure as high as specified in Table 7 of AHRI 9202020
when operating at a manufacturerspecified airflow rate and that is distributed in commerce as part of an individual model within the same basic model of a DDXDOAS that is distributed in commerce with a different motor specified for testing that can maintain the required external static pressure.
Issue8: DOE is requesting comment on the proposed definition of nonstandard low-static fan motor and whether the proposed definition reflects stakeholder understanding of the term.

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iii. Calculation of Supplementary Heat Penalty Section 6.1.3.1 of ANSI/AHRI 920
2015 includes a supplementary heat penalty for units that are unable to achieve the minimum supply air drybulb temperature of 70 F while testing at each Standard Rating Condition specified in Table 2 and Table 3 of ANSI/AHRI 9202015. The supplementary heat penalty calculates the difference in enthalpy from the delivered supply air and air at the minimum supply air temperature 70 F. After reviewing the equations, DOE noted in the July 2017 ASHRAE TP
RFI that the term for supply airflow rate is missing from the supplementary heat penalty equations. 82 FR 34427, 34436
July 25, 2017.
In response to the July 2017 ASHRAE
TP RFI, AHRI confirmed that the supplementary heat formula in ANSI/
AHRI 9202015 is missing the airflow term, QSA, in section 6.1.3.1, and the organization committed to include such term in the next revision of the test standard. AHRI, No. 11 at p. 11 DOE
notes that this change has been included in AHRI 9202020, thereby resolving the problem. Accordingly, DOE
proposes to adopt the revised supplementary heat penalty equation contained in AHRI 9202020 that includes the supply airflow rate term section 6.1.3.1 Initial Standard Rating Condition A Dehumidification Test, as enumerated in section 2.2.1c of the proposed Appendix B.
In the July 2017 ASHRAE TP RFI, DOE further noted that section 6.1.3.1 of ANSI/AHRI 9202015 calls for a supplementary heat penalty if the supply air temperature is less than 70 F, but the incorporation of this penalty into the MRE and COP
equations is not clearly described. DOE
also noted that it is not clear whether the ANSI/ASHRAE 1982013 test method considers this penalty. 82 FR
34427, 3443634437 July 25, 2017.
AHRI commented that the supplementary heat penalty should be added if the minimum 70 F
temperature is not met, and that this value is added to the measured power input, which is represented as PT in section 10.6 of ANSI/ASHRAE 198
2013. AHRI, No. 11 at p. 11 DOE notes that this clarification is included in section 6.9 of AHRI 9202020 in the calculation of MRE70, which incorporates the energy impact of heating the supply air to 70 F. As discussed in section III.B.2 of this NOPR, DOE is proposing to adopt the ISMRE2 metric specified in section 6.13
of AHRI 9202020 that does not include
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the supplementary heat penalty as the regulated metric for DDXDOAS, while the MRE70 and ISMRE270 metric that incorporates the supplementary heat penalty may be used for representations.
As a result, the supplementary heat penalty would only be added to the total power input for the calculation of the optional MRE70 ratings.
With regards to the COP calculation, AHRI commented that the intent was that the supplementary heat penalty would be added to the numerator as additional heat capacity and the denominator as additional power consumed to calculate a COP indicative of running an electric heater to meet a supply air temperature of 70 F. AHRI, No. 11 at p. 13 DOE notes that this clarification was included in section 6.11.2 of AHRI 9202020 in the renamed COPISCOP metric, and accordingly, DOE is proposing to adopt the revised COPISCOP calculation section 6.11.2 of AHRI 9202020, as enumerated in section 2.2.1c of the proposed Appendix B.
2. Determination of Represented Values a. Basic Model To determine the energy efficiency of a basic model, DOEs certification requirements generally require manufacturers to test a sample of units of that basic model to represent its performance. 10 CFR 429.11 The basic model may include multiple individual models having similar performance features and characteristics. Typically, DOE provides a definition of a basic model for each type of covered equipment. In this NOPR, DOE proposes a definition for DDXDOAS basic model derived from the basic model definition for other commercial packaged air conditioning and heating equipment set forth at 10 CFR 431.92. Specifically, DOE replaced the criterion to have common nominal cooling capacity with common nominal MRC. DOE is also proposing to include the common nominal MRC in the definition of a basic model for small, large and very large air-cooled or water-cooled commercial package air conditioning and heating equipment, which includes DDXDOASes. The proposed definition of basic model of a DDXDOAS also specifies that a basic model must include units with similar VERS
equipment. DOE is proposing in this specification to reflect that ASHRAE
Standard 90.1 delineates DDXDOAS
equipment classes, in part, based on VERS, and the proposed test procedure considers the conditioning contribution of the VERS equipment.

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