[Federal Register Volume 85, Number 247 (Wednesday, December 23, 2020)]
[Notices]
[Pages 83927-83935]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2020-26322]


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DEPARTMENT OF ENERGY

[Case Number 2020-009; EERE-2020-BT-WAV-0025]


Energy Conservation Program: Notice of Petition for Waiver of 
Heat Transfer Products Group From the Department of Energy Walk-In 
Coolers and Walk-In Freezers Test Procedure and Notice of Grant of 
Interim Waiver

AGENCY: Office of Energy Efficiency and Renewable Energy, Department of 
Energy.

ACTION: Notification of petition for waiver and grant of an interim 
waiver; request for comments.

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SUMMARY: This document announces receipt of and publishes a petition 
for waiver and interim waiver from Heat Transfer Products Group 
(``HTPG''), which seeks a waiver for specified carbon dioxide (``CO2'') 
direct expansion unit cooler basic models from the U.S. Department of 
Energy (``DOE'') test procedure used to determine the efficiency of 
walk-in cooler and walk-in freezer refrigeration systems. DOE also 
gives notice of an Interim Waiver Order that requires HTPG to test and 
rate the specified CO2 direct expansion unit cooler basic models in 
accordance with the alternate test procedure set forth in the Interim 
Waiver Order. DOE solicits comments, data, and information concerning 
HTPG's petition and its suggested alternate test procedure so as to 
inform DOE's final decision on HTPG's waiver request.

DATES: The Interim Waiver Order is effective on December 23, 2020. 
Written comments and information will be accepted on or before January 
22, 2021.

ADDRESSES: Interested persons are encouraged to submit comments using 
the Federal eRulemaking Portal at http://www.regulations.gov. 
Alternatively, interested persons may submit comments, identified by 
case number ``2020-009'', and Docket number ``EERE-2020-BT-WAV-0025,'' 
by any of the following methods:
    <bullet> Federal eRulemaking Portal: http://www.regulations.gov. 
Follow the instructions for submitting comments.
    <bullet> Email: <a href="/cdn-cgi/l/email-protection#bdf5e9edfa8f8d8f8deafceb8d8d8f88fdd8d893d9d2d893dad2cb"><span class="__cf_email__" data-cfemail="a8e0fcf8ef9a989a98ffe9fe98989a9de8cdcd86ccc7cd86cfc7de">[email protected]</span></a>. Include Case No. 2020-
009 in the subject line of the message.
    <bullet> Postal Mail: Appliance and Equipment Standards Program, 
U.S. Department of Energy, Office of Energy Efficiency and Renewable 
Energy, Building Technologies Office, Mail Stop EE-5B, Petition for 
Waiver Case No. 2020-009, 1000 Independence Avenue SW, Washington, DC 
20585-0121. If possible, please submit all items on a compact disc 
(``CD''), in which case it is not necessary to include printed copies.
    <bullet> Hand Delivery/Courier: Appliance and Equipment Standards 
Program, U.S. Department of Energy, Building Technologies Office, 950 
L'Enfant Plaza SW, 6th floor, Washington, DC 20024. Telephone: (202) 
287-1445. If possible, please submit all items on a CD, in which case 
it is not necessary to include printed copies.
    No telefacsimilies (``faxes'') will be accepted. For detailed 
instructions on submitting comments and additional information on this 
process, see the SUPPLEMENTARY INFORMATION section of this document.
    Docket: The docket, which includes Federal Register notices, 
comments, and other supporting documents/materials, is available for 
review at http://www.regulations.gov. All documents in the docket are 
listed in the http://www.regulations.gov index. However, some documents 
listed in the index, such as those containing information that is 
exempt from public disclosure, may not be publicly available.
    The docket web page can be found at http://www.regulations.gov/docket?D=EERE-2020-BT-WAV-0025. The docket web page contains 
instruction on how to access all documents, including public comments, 
in the docket. See the SUPPLEMENTARY INFORMATION section for 
information on how to submit comments through http://www.regulations.gov.

FOR FURTHER INFORMATION CONTACT: Ms. Lucy deButts, U.S. Department of 
Energy, Office of Energy Efficiency and Renewable Energy, Building 
Technologies Office, Mail Stop EE-5B, 1000 Independence Avenue SW, 
Washington, DC 20585-0121. Email: <a href="/cdn-cgi/l/email-protection#5e1f0d01093f37283b2c010c3b2f2b3b2d2a1e3b3b703a313b70393128"><span class="__cf_email__" data-cfemail="df9e8c8088beb6a9baad808dbaaeaabaacab9fbabaf1bbb0baf1b8b0a9">[email protected]</span></a>.
    Michael Kido, U.S. Department of Energy, Office of the General 
Counsel, Mail Stop GC-33, Forrestal Building, 1000 Independence Avenue 
SW, Washington, DC 20585-0103. Telephone: (202) 586-8145. Email: 
<a href="/cdn-cgi/l/email-protection#a9e4c0cac1c8ccc587e2c0cdc6e9c1d887cdc6cc87cec6df"><span class="__cf_email__" data-cfemail="561b3f353e37333a781d3f3239163e277832393378313920">[email protected]</span></a>.

SUPPLEMENTARY INFORMATION: DOE is publishing HTPG's petition for waiver 
in its entirety, pursuant to 10 CFR 431.401(b)(1)(iv).\1\ DOE invites 
all interested parties to submit in writing by January 22, 2021, 
comments and information on all aspects of the petition, including the 
alternate test procedure. Pursuant to 10 CFR 431.401(d), any person 
submitting written comments to DOE must also send a copy of such 
comments to the petitioner. The contact information for the petitioner 
is Michael Straub, <a href="/cdn-cgi/l/email-protection#9ff2f6f4fab1ecebedfeeafddff7ebeff8b1fcf0f2"><span class="__cf_email__" data-cfemail="a7caceccc289d4d3d5c6d2c5e7cfd3d7c089c4c8ca">[email protected]</span></a>, 201 Thomas French Dr., 
Scottsboro, AL 35769-7405.
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    \1\ The petition did not identify any of the information 
contained therein as confidential business information.
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    Submitting comments via http://www.regulations.gov. The http://www.regulations.gov web page will require you to provide your name and 
contact information. Your contact information will be viewable to DOE 
Building Technologies staff only. Your contact information will not be 
publicly viewable except for your first and last names, organization 
name (if any), and submitter representative name (if any). If your 
comment is not processed properly because of technical difficulties, 
DOE will use this information to contact you. If DOE cannot read your 
comment due to technical difficulties and cannot contact you for 
clarification, DOE may not be able to consider your comment.
    However, your contact information will be publicly viewable if you 
include it in the comment or in any documents attached to your comment. 
Any information that you do not want to be publicly viewable should not 
be included in your comment, nor in any document attached to your 
comment. If this instruction is followed, persons viewing comments will 
see only first and last names, organization names, correspondence 
containing comments, and any documents submitted with the comments.
    Do not submit to http://www.regulations.gov information for which 
disclosure is restricted by statute, such as trade secrets and 
commercial or financial information (hereinafter referred to as 
Confidential Business Information (``CBI'')). Comments submitted 
through http://www.regulations.gov cannot be claimed as CBI. Comments 
received through the website will waive any CBI claims for the 
information submitted. For information on submitting CBI, see the 
Confidential Business Information section.
    DOE processes submissions made through http://www.regulations.gov 
before posting. Normally, comments

[[Page 83928]]

will be posted within a few days of being submitted. However, if large 
volumes of comments are being processed simultaneously, your comment 
may not be viewable for up to several weeks. Please keep the comment 
tracking number that http://www.regulations.gov provides after you have 
successfully uploaded your comment.
    Submitting comments via email, hand delivery/courier, or postal 
mail. Comments and documents submitted via email, hand delivery/
courier, or postal mail also will be posted to http://www.regulations.gov. If you do not want your personal contact 
information to be publicly viewable, do not include it in your comment 
or any accompanying documents. Instead, provide your contact 
information on a cover letter. Include your first and last names, email 
address, telephone number, and optional mailing address. The cover 
letter will not be publicly viewable as long as it does not include any 
comments.
    Include contact information each time you submit comments, data, 
documents, and other information to DOE. If you submit via postal mail 
or hand delivery/courier, please provide all items on a CD, if 
feasible, in which case it is not necessary to submit printed copies. 
Faxes will not be accepted.
    Comments, data, and other information submitted to DOE 
electronically should be provided in PDF (preferred), Microsoft Word or 
Excel, WordPerfect, or text (ASCII) file format. Provide documents that 
are not secured, written in English and free of any defects or viruses. 
Documents should not contain special characters or any form of 
encryption and, if possible, they should carry the electronic signature 
of the author.
    Campaign form letters. Please submit campaign form letters by the 
originating organization in batches of between 50 to 500 form letters 
per PDF or as one form letter with a list of supporters' names compiled 
into one or more PDFs. This reduces comment processing and posting 
time.
    Confidential Business Information. According to 10 CFR 1004.11, any 
person submitting information that he or she believes to be 
confidential and exempt by law from public disclosure should submit via 
email, postal mail, or hand delivery/courier two well-marked copies: 
One copy of the document marked confidential including all the 
information believed to be confidential, and one copy of the document 
marked ``non-confidential'' with the information believed to be 
confidential deleted. Submit these documents via email or on a CD, if 
feasible. DOE will make its own determination about the confidential 
status of the information and treat it according to its determination.
    It is DOE's policy that all comments may be included in the public 
docket, without change and as received, including any personal 
information provided in the comments (except information deemed to be 
exempt from public disclosure).

Signing Authority

    This document of the Department of Energy was signed on November 
24, 2020, by Alexander N. Fitzsimmons, Deputy Assistant Secretary for 
Energy Efficiency, Energy Efficiency and Renewable Energy, pursuant to 
delegated authority from the Secretary of Energy. That document with 
the original signature and date is maintained by DOE. For 
administrative purposes only, and in compliance with requirements of 
the Office of the Federal Register, the undersigned DOE Federal 
Register Liaison Officer has been authorized to sign and submit the 
document in electronic format for publication, as an official document 
of the Department of Energy. This administrative process in no way 
alters the legal effect of this document upon publication in the 
Federal Register.

    Signed in Washington, DC, on November 24, 2020.
Treena V. Garrett,
Federal Register Liaison Officer, U.S. Department of Energy.

Case Number 2020-009

Interim Waiver Order

I. Background and Authority

    The Energy Policy and Conservation Act, as amended (``EPCA''),\1\ 
authorizes the U.S. Department of Energy (``DOE'') to regulate the 
energy efficiency of a number of consumer products and certain 
industrial equipment (42 U.S.C. 6291-6317). Title III, Part C \2\ of 
EPCA (42 U.S.C. 6311-6316, as codified), added by the National Energy 
Conservation Policy Act, Public Law 95-619, sec. 441 (Nov. 9, 1978), 
established the Energy Conservation Program for Certain Industrial 
Equipment, which sets forth a variety of provisions designed to improve 
the energy efficiency for certain types of industrial equipment. 
Through amendments brought about by the Energy Independence and 
Security Act of 2007, Public Law 110-140, sec. 312 (Dec. 19, 2007), 
this equipment includes walk-in cooler and walk-in freezer 
(collectively, ``walk-in'') refrigeration systems, the focus of this 
document (42 U.S.C. 6311(1)(G)).
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    \1\ All references to EPCA in this document refer to the statute 
as amended through America's Water Infrastructure Act of 2018, 
Public Law 115-270 (Oct. 23, 2018).
    \2\ For editorial reasons, upon codification in the U.S. Code, 
Part C was redesignated as Part A-1.
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    The energy conservation program under EPCA consists essentially of 
four parts: (1) Testing, (2) labeling, (3) Federal energy conservation 
standards, and (4) certification and enforcement procedures. Relevant 
provisions of EPCA include definitions (42 U.S.C. 6311), energy 
conservation standards (42 U.S.C. 6313), test procedures (42 U.S.C. 
6314), labeling provisions (42 U.S.C. 6315), and the authority to 
require information and reports from manufacturers (42 U.S.C. 6316).
    The Federal testing requirements consist of test procedures that 
manufacturers of covered equipment must use as the basis for: (1) 
Certifying to DOE that their equipment complies with the applicable 
energy conservation standards adopted pursuant to EPCA (42 U.S.C. 
6316(a); 42 U.S.C. 6295(s)), and (2) making representations about the 
efficiency of that equipment (42 U.S.C. 6314(d)). Similarly, DOE must 
use these test procedures to determine whether the covered equipment 
complies with relevant standards promulgated under EPCA. (42 U.S.C. 
6316(a); 42 U.S.C. 6295(s))
    Under 42 U.S.C. 6314, EPCA sets forth the criteria and procedures 
DOE is required to follow when prescribing or amending test procedures 
for covered equipment. EPCA requires that any test procedures 
prescribed or amended under this section must be reasonably designed to 
produce test results which reflect the energy efficiency, energy use or 
estimated annual operating cost of covered equipment during a 
representative average use cycle and requires that test procedures not 
be unduly burdensome to conduct (42 U.S.C. 6314(a)(2)). The test 
procedure for walk-in refrigeration systems is contained in the Code of 
Federal Regulations (``CFR'') at 10 CFR part 431, subpart R, appendix 
C, Uniform Test Method for the Measurement of Net Capacity and AWEF of 
Walk-In Cooler and Walk-In Freezer Refrigeration Systems (``Appendix 
C'').
    Under 10 CFR 431.401, any interested person may submit a petition 
for waiver from DOE's test procedure requirements. DOE will grant a 
waiver from the test procedure requirements if DOE determines either 
that the basic model for which the waiver was requested contains a 
design characteristic that prevents testing of the basic model 
according to the prescribed test procedures, or that the prescribed

[[Page 83929]]

test procedures evaluate the basic model in a manner so 
unrepresentative of its true energy consumption characteristics as to 
provide materially inaccurate comparative data. 10 CFR 431.401(f)(2). A 
petitioner must include in its petition any alternate test procedures 
known to the petitioner to evaluate the performance of the equipment 
type in a manner representative of the energy consumption 
characteristics of the basic model. 10 CFR 431.401(b)(1)(iii). DOE may 
grant the waiver subject to conditions, including adherence to 
alternate test procedures specified by DOE. 10 CFR 431.401(f)(2).
    As soon as practicable after the granting of any waiver, DOE will 
publish in the Federal Register a notice of proposed rulemaking to 
amend its regulations so as to eliminate any need for the continuation 
of such waiver. 10 CFR 431.401(l). As soon thereafter as practicable, 
DOE will publish in the Federal Register a final rule to that effect. 
Id.
    The waiver process also provides that DOE may grant an interim 
waiver if it appears likely that the underlying petition for waiver 
will be granted and/or if DOE determines that it would be desirable for 
public policy reasons to grant immediate relief pending a determination 
on the underlying petition for waiver. 10 CFR 431.401(e)(2). Within one 
year of issuance of an interim waiver, DOE will either: (i) Publish in 
the Federal Register a determination on the petition for waiver; or 
(ii) publish in the Federal Register a new or amended test procedure 
that addresses the issues presented in the waiver. 10 CFR 
431.401(h)(1).
    When DOE amends the test procedure to address the issues presented 
in a waiver, the waiver will automatically terminate on the date on 
which use of that test procedure is required to demonstrate compliance. 
10 CFR 431.401(h)(2).

II. HTPG's Petition for Waiver and Interim Waiver

    On July 6, 2020, HTPG filed a petition for waiver and interim 
waiver from the test procedure for walk-in refrigeration systems set 
forth at 10 CFR part 431, subpart R, appendix C (HTPG, No. 1 at p. 1 
\3\). HTPG claims that the test conditions described in Table 15 and 
Table 16 of the Air-Conditioning, Heating, and Refrigeration Institute 
(``AHRI'') Standard 1250-2009, Standard for Performance Rating of Walk-
In Coolers and Freezers (``AHRI 1250-2009'') (for walk-in refrigerator 
unit coolers and freezer unit coolers tested alone, respectively), as 
incorporated by Appendix C with modification, cannot be achieved by the 
specified basic models and are not consistent with operation of HTPG's 
CO<INF>2</INF> direct expansion unit coolers . HTPG stated that 
CO<INF>2</INF> has a critical temperature of 87.8 [deg]F,\4\ and thus 
the required liquid inlet saturation temperature of 105 [deg]F and the 
required liquid inlet subcooling temperature of 9 [deg]F are not 
achievable, and that the test conditions should be more consistent with 
typical operating conditions for a transcritical CO<INF>2</INF> booster 
system (HTPG, No. 1).
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    \3\ A notation in the form ``HTPG, No.1'' identifies a written 
submission: (1) Made by HTPG; and (2) recorded in document number 1 
that is filed in the docket of this petition for waiver (Docket No. 
EERE-2020-BT-WAV-0025) and available at http://www.regulations.gov/docket?D=EERE-2020-BT-WAV-0025.
    \4\ The test procedure specifies the unit cooler refrigerant 
inlet condition in terms of a saturation temperature (the 
temperature at which it completes the condensation process in a 
condenser) and the subcooling temperature (additional reduction in 
temperature lower than the specified saturation temperature). For 
CO<INF>2</INF>, the critical temperature above which there cannot 
exist separate liquid and gas phases is below the saturation 
condition specified in the test procedure, hence the specified 
condition cannot be achieved.
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    The statements made by HTPG reference the difference in 
thermodynamic properties between CO<INF>2</INF> and other refrigerants. 
At modest pressures (i.e. below the critical point), many substances 
transition from a solid to a liquid to a gas as temperature increases. 
For example, a pure substance like water transitions from liquid to 
steam at a specific temperature, e.g. 212 [deg]F, at atmospheric 
pressure. As heat is added during a liquid to gas transition, the 
temperature remains constant and the substance coexists as both liquid 
and vapor. Continuing to add heat converts more of the liquid to vapor 
at a constant temperature. The reverse occurs when heat is removed. 
However, the transition temperature depends on the pressure--the higher 
the pressure, the higher the transition temperature. This is a key 
principle in refrigeration systems, which operate at two pressure 
levels associated with two temperatures. A refrigerant absorbs heat 
when it is at a low temperature and pressure, converting to gas and 
cooling the surrounding space. At high temperature and pressure, the 
refrigerant transitions to a liquid while releasing heat to the 
environment. A compressor is used to raise the low-pressure gas to a 
high pressure, and a throttle (pressure reduction device) is used to 
reduce the pressure once the refrigerant has been fully liquefied 
(condensed) at high pressure.
    All refrigerants have a ``critical pressure'' and an associated 
``critical temperature'' above which liquid and vapor phases cannot 
coexist. Above this critical point, the refrigerant will be a gas and 
its temperature will increase or decrease as heat is added or removed. 
For all conventional refrigerants, the critical pressure is so high 
that it is never exceeded in typical refrigeration cycles. For example, 
R404A is a common refrigerant used in refrigeration systems that has a 
critical pressure of 540.8 psia \5\ with an associated critical 
temperature of 161.7 [deg]F. However, CO<INF>2</INF> behaves 
differently, with a critical pressure of 1,072 psia associated with a 
much lower critical temperature of 87.8 [deg]F. The refrigerant 
temperature must be somewhat higher than the ambient temperature in 
order to reject refrigeration cycle heat to the ambient environment. 
Ambient temperatures greater than 87.8 [deg]F are common and the 
performance of many refrigeration and air conditioning systems are 
tested using a 95 [deg]F ambient temperature, as indicated by the A 
test condition in AHRI 1250-2009 Section 5. At temperatures greater 
than the critical temperature, the CO<INF>2</INF> refrigerant is in a 
supercritical state (i.e. a condition with pressure above the critical 
temperature) and heat is transferred to the environment. Since useful 
cooling is provided below the critical temperature, CO<INF>2</INF> 
cycles are said to be transcritical.
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    \5\ Absolute pressure is the pressure measured relative to a 
complete vacuum; ``psia'' represents the absolute pressure in pounds 
per square inch.
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    The transcritical nature of CO<INF>2</INF> generally requires more 
complex refrigeration cycle design to approach the efficiency of 
traditional refrigerants (i.e., R404A, R407A, R448A, etc.) during 
operation in high temperature conditions. To increase efficiency and 
prevent overheating, transcritical booster systems introduce (or use) 
multiple stages of compression and intercooling. CO<INF>2</INF> is 
cooled in the gas cooler of a transcritical booster system, then 
expands through a high-pressure control valve and is delivered to a 
subcritical-pressure flash tank. In the flash tank, the refrigerant is 
in the subcritical phase and the liquid and vapor phases can be 
separated. A unit cooler in a CO<INF>2</INF> booster system would be 
supplied with liquid refrigerant from the flash tank via expansion 
valves where the refrigerant is evaporated. The evaporated refrigerant 
is subsequently compressed up to gas cooler pressure to complete the 
cycle (HTPG, No. 2).

[[Page 83930]]

    HTPG also requests an interim waiver from the existing DOE test 
procedure. DOE will grant an interim waiver if it appears likely that 
the petition for waiver will be granted, and/or if DOE determines that 
it would be desirable for public policy reasons to grant immediate 
relief pending a determination of the petition for waiver. See 10 CFR 
431.401(e)(2).
    Based on the assertions in the petition, absent an interim waiver, 
the prescribed test procedure is not appropriate for HTPG's 
CO<INF>2</INF> direct expansion unit coolers and the test conditions 
are not achievable, since CO<INF>2</INF> refrigerant has a critical 
temperature of 87.8 [deg]F and the current DOE test procedure calls for 
a liquid inlet saturation temperature of 105 [deg]F. The inability to 
achieve test conditions for the stated basic models would result in 
economic hardship from loss of sales stemming from the inability of the 
DOE test procedure to address the operating conditions of HTPG's 
equipment.

III. Requested Alternate Test Procedure

    EPCA requires that manufacturers use the applicable DOE test 
procedures when making representations about the energy consumption and 
energy consumption costs of covered equipment (42 U.S.C. 6314(d)). 
Consistency is important when making representations about the energy 
efficiency of equipment, including when demonstrating compliance with 
applicable DOE energy conservation standards. Pursuant to 10 CFR 
431.401, and after consideration of public comments on the petition, 
DOE may establish in a subsequent Decision and Order an alternate test 
procedure for the basic models addressed by the Interim Waiver Order.
    HTPG seeks to test and rate specific CO<INF>2</INF> direct 
expansion unit cooler basic models with modifications to the DOE test 
procedure. HTPG's suggested approach specifies using modified liquid 
inlet saturation and liquid inlet subcooling temperatures--38[deg]F and 
5[deg]F, respectively, for both walk-in refrigerator unit coolers and 
walk-in freezer unit coolers. Additionally, HTPG recommends that 
because the subject units are used in transcritical CO<INF>2</INF> 
booster systems the calculations in AHRI 1250-2009 section 7.9 should 
be used to determine AWEF and net capacity for unit coolers matched to 
parallel rack systems as required under the DOE test procedure. This 
section of AHRI 1250-2009 is prescribed by the DOE test procedure for 
determining AWEF for all unit coolers tested alone (see 10 CFR part 
431, subpart R, appendix C, section 3.3.1). Finally, HTPG also 
recommends that AHRI 1250-2009 Table 17, EER for Remote Commercial 
Refrigerated Display Merchandisers and Storage Cabinets, should be used 
to determine power consumption of CO<INF>2</INF> direct expansion unit 
cooler systems as required under the DOE test procedure.

IV. Interim Waiver Order

    DOE has reviewed HTPG's application, its suggested testing 
approach, industry materials regarding CO<INF>2</INF> transcritical 
booster systems, and HTPG's consumer-facing materials, including 
websites and product specification sheets for the basic models listed 
in HTPG's petition. Based on this review, the suggested testing 
approach appears to allow for the accurate measurement of energy 
efficiency of the specified basic models, while alleviating the testing 
issues associated with HTPG's implementation of walk-in cooler and 
walk-in freezer testing for these basic models. Review of the 
CO<INF>2</INF> refrigeration market confirms that the test conditions 
of the testing approach suggested by HTPG would be representative for 
operation of a unit cooler used in a transcritical CO<INF>2</INF> 
booster system (HTPG, No. 4). CO<INF>2</INF> that is cooled in the gas 
cooler of a transcritical booster system expands through a high-
pressure control valve that delivers CO<INF>2</INF> to a subcritical-
pressure flash tank, where liquid and vapor phases of the refrigerant 
are separated. The liquid is then split and the unit coolers receive 
the refrigerant at the same condition, consistent with the use of the 
same liquid inlet saturation temperature for both the medium- and low-
temperature systems in HTPG's suggested test approach. Calculations on 
other external CO<INF>2</INF> refrigeration system designs in the 
market indicate that the 38 [deg]F liquid unit cooler inlet saturation 
temperature suggested by HTPG is representative of CO<INF>2</INF> 
booster systems (HTPG, No. 2). Regarding use of the EER values in AHRI 
1250-2009 Table 17 to determine the representative compressor power 
consumption for CO<INF>2</INF> unit cooler systems, research into the 
performance of different configurations of CO<INF>2</INF> booster 
systems shows that enhanced CO<INF>2</INF> cycles (like those used in 
transcritical booster systems) can match conventional refrigerants in 
average annual efficiency (HTPG, No. 3). These data and studies help to 
justify the use of the EER values in AHRI 1250-2009 Table 17 for 
determining the power consumption of CO<INF>2</INF> booster system 
evaporators, even though these EER values were initially established 
for conventional refrigerants. Consequently, DOE has determined that 
HTPG's petition for waiver likely will be granted. Furthermore, DOE has 
determined that it is desirable for public policy reasons to grant HTPG 
immediate relief pending a determination of the petition for waiver.
    For the reasons stated, it is ordered that:
    (1) HTPG must test and rate the following CO<INF>2</INF> direct 
expansion unit cooler basic models with the alternate test procedure 
set forth in paragraph (2).
    Russell branded Basic Model Numbers:

     RL6A041ADAF        RL6A041DDAF        RL6A052ADAF        RL6A052DDAF        RL6A066ADAF        RL6A066DDAF
     RL6A073ADAF        RL6A073DDAF        RL6A094ADAF        RL6A094DDAF        RL6A117ADAF        PL6A117DDAF
     RL6A130ADAF        RL6A130DDAF        RL6A141ADAF        RL6A141DDAF        RL6A161ADAF        RL6A161DDAF
     RL6A181ADAF        RL6A181DDAF        RL6A195ADAF        RL6A195DDAF        RL6A235ADAF        RL6A235DDAF
     RL6A260ADAF        RL6A260DDAF        RL6A295ADAF        RL6A295DDAF        RL6A330ADAF        RL6A330DDAF
     RL6A390ADAF        RL6A390DDAF        RL6E035DDAF        RL6E042DDAF        RL6E049DDAF        RL6E066DDAF
     RL6E077DDAF        RL6E090DDAF        RL6E105DDAF        RL6E121DDAF        RL6E142DDAF        RL6E162DDAF
     RL6E182DDAF        RL6E200DDAF        RL6E200EDAF        RL6E244DDAF        RL6E244EDAF        RL6E281DDAF
     RL6E281EDAF        RL4E027DDAF        RL4E032DDAF        RL4E038DDAF        RL4E051DDAF        RL4E064DDAF
     RL4E080DDAF        RL4E094DDAF        RL4E110DDAF        RL4E125DDAF        RL4E141DDAF        RL4E155DDAF
     RL4E155EDAF        RL4E195DDAF        RL4E195EDAF        RL4E230DDAF        RL4E230EDAF
 
     RM6A182ADAF        RM6A182DDAF        RM6A182FDAF        RM6A220ADAF        RM6A220DDAF        RM6A220FDAF
     RM6A276ADAF        RM6A276DDAF        RM6A276FDAF        RM6A370ADAF        RM6A370DDAF        RM6A370FDAF
     RM6A442ADAF        RM6A442DDAF        RM6A442FDAF        RM6A549ADAF        RM6A549DDAF        RM6A549FDAF
     RM6A658ADAF        RM6A658DDAF        RM6A658FDAF        RM6E153DDAF        RM6E153EDAF        RM6E153FDAF
     RM6E153GDAF        RM6E184DDAF        RM6E184EDAF        RM6E184FDAF        RM6E184GDAF        RM6E311DDAF
     RM6E311EDAF        RM6E311FDAF        RM6E311GDAF        RM6E374DDAF        RM6E374EDAF        RM6E374FDAF
     RM6E374GDAF        RM6E469EDAF        RM6E469FDAF        RM6E469GDAF        RM6E564EDAF        RM6E564FDAF

[[Page 83931]]

 
     RM6E564GDAF        RM4E110DDAF        RM4E110EDAF        RM4E110FDAF        RM4E110GDAF        RM4E143DDAF
     RM4E143EDAF        RM4E143FDAF        RM4E143GDAF        RM4E232DDAF        RM4E232EDAF        RM4E232FDAF
     RM4E232GDAF        RM4E288DDAF        RM4E288EDAF        RM4E288FDAF        RM4E288GDAF        RM4E336EDAF
     RM4E336FDAF        RM4E336GDAF        RM4E419EDAF        RM4E419FDAF        RM4E419GDAF
 
     RV6A043ADAF        RV6A043DDAF        RV6A053ADAF        RV6A053DDAF        RV6A085ADAF        RV6A085DDAF
     RV6A106ADAF        RV6A106DDAF        RV6A129ADAF        RV6A129DDAF        RV6A158ADAF        RV6A158DDAF
     RV6A176ADAF        RV6A176DDAF        RV6A218ADAF        RV6A218DDAF        RV6A271ADAF        RV6A271DDAF
     RV6E043DDAF        RV6E053DDAF        RV6E085DDAF        RV6E106DDAF        RV6E129DDAF        RV6E158DDAF
     RV6E176DDAF        RV6E218DDAF        RV6E271DDAF
 
   ASLA25048ADAF      ASLA25048DDAF      ASLA25061ADAF      ASLA25061DDAF      ASLA35073ADAF      ASLA35073DDAF
   ASLA45098ADAF      ASLA45098DDAF      ASLA55122ADAF      ASLA55122DDAF      ASLA65158ADAF      ASLA65158DDAF
   ASLE25048DDAF      ASLE25058DDAF      ASLE35070DDAF      ASLE45094DDAF      ASLE55117DDAF      ASLE65150DDAF
 
     RE6A041ADAF        RE6A041DDAF        RE6A070ADAF        RE6A070DDAF        RE6A084ADAF        RE6A084DDAF
     RE6A104ADAF        RE6A104DDAF        RE6A128ADAF        RE6A128DDAF        RE6A141ADAF        RE6A141DDAF
     RE6A169ADAF        RE6A169DDAF        RE6A204ADAF        RE6A204DDAF        RE6A258ADAF        RE6A258DDAF
     RE6E037DDAF        RE6E045DDAF        RE6E075DDAF        RE6E089DDAF        RE6E108DDAF        RE6E125DDAF
     RE6E137DDAF        RE6E182DDAF        RE6E221DDAF        RE6E278DDAF        RE4E037DDAF        RE4E075DDAF
     RE4E107DDAF        RE4E149DDAF        RE4E186DDAF        RE4E234DDAF
 
     RH6A031DDAF        RH6A031FDAF        RH6A043DDAF        RH6A043FDAF        RH6A052DDAF        RH6A052FDAF
     RH6A063DDAF        RH6A063FDAF        RH6A087DDAF        RH6A087FDAF        RH6A105DDAF        RH6A105FDAF
     RH6A132DDAF        RH6A132FDAF        RH6A156DDAF        RH6A156FDAF        RH6A175DDAF        RH6A175FDAF
     RH6A209DDAF        RH6A209FDAF        RH6E033DDAF        RH6E033EDAF        RH6E033FDAF        RH6E033GDAF
     RH6E044DDAF        RH6E044EDAF        RN6E044FDAF        RH6E044GDAF        RH6E053DDAF        RH6E053EDAF
     RH6E053FDAF        RH6E053GDAF        RH6E066DDAF        RH6E066EDAF        RH6E066FDAF        RH6E066GDAF
     RH6E089DDAF        RH6E089EDAF        RH6E089FDAF        RH6E089GDAF        RH6E109DDAF        RH6E109EDAF
     RH6E109FDAF        RH6E109GDAF        RH6E134DDAF        RH6E134EDAF        RH6E134FDAF        RH6E134GDAF
     RH6E163DDAF        RH6E163EDAF        RH6E163FDAF        RH6E163GDAF        RH6E199DDAF        RH6E199EDAF
     RH6E199FDAF        RH6E199GDAF        RH4E035DDAF        RH4E035EDAF        RH4E035FDAF        RH4E035GDAF
     RH4E044DDAF        RH4E044EDAF        RH4E044FDAF        RH4E044GDAF        RH4E071DDAF        RH4E071EDAF
     RH4E071FDAF        RH4E071GDAF        RH4E087DDAF        RH4E087EDAF        RH4E087FDAF        RH4E087GDAF
     RH4E107DDAF        RH4E107EDAF        RH4E107FDAF        RH4E107GDAF        RH4E131DDAF        RH4E131EDAF
     RH4E131FDAF        RH4E131GDAF        RH4E167DDAF        RH4E167EDAF        RH4E167FDAF        RH4E167GDAF
 

    (2) The HTPG basic models identified in paragraph (1) of this 
Interim Waiver Order shall be tested according to the test procedure 
for walk-in cooler and walk-in freezer refrigeration systems prescribed 
by DOE at 10 CFR part 431, subpart R, appendix C (``Appendix C''), 
except that the liquid inlet saturation temperature test condition and 
liquid inlet subcooling temperature test condition shall be modified to 
38[deg]F and 5[deg]F, respectively, for both walk-in refrigerator unit 
coolers and walk-in freezer unit coolers, as detailed below. All other 
requirements of Appendix C and DOE's regulations remain applicable.
    In Appendix C, under section 3.1. General modifications: Test 
Conditions and Tolerances, revise section 3.1.5., to read as follows:
    3.1.5. Tables 15 and 16 shall be modified to read as follows:

                                                           Table 15--Refrigerator Unit Cooler
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                       Unit cooler  Unit cooler                  Liquid       Liquid
                                           air          air       Saturated      inlet        inlet
           Test description              entering     entering     suction     saturation   subcooling    Compressor  capacity        Test objective
                                        dry-bulb,     relative      temp,        temp,        temp,
                                          [deg]F    humidity, %     [deg]F       [deg]F       [deg]F
--------------------------------------------------------------------------------------------------------------------------------------------------------
Off Cycle Fan Power..................           35          <50  ...........  ...........  ...........  Compressor Off.........  Measure fan input power
                                                                                                                                  during compressor off
                                                                                                                                  cycle.
Refrigeration Capacity Suction A.....           35          <50           25           38            5  Compressor On..........  Determine Net
                                                                                                                                  Refrigeration Capacity
                                                                                                                                  of Unit Cooler.
--------------------------------------------------------------------------------------------------------------------------------------------------------
Note: Superheat to be set according to equipment specification in equipment or installation manual. If no superheat specification is given, a default
  superheat value of 6.5 [deg]F shall be used. The superheat setting used in the test shall be reported as part of the standard rating.


                                                              Table 16--Freezer Unit Cooler
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                       Unit cooler  Unit cooler                  Liquid       Liquid
                                           air          air       Saturated      inlet        inlet
           Test description              entering     entering     suction     saturation   subcooling    Compressor  capacity        Test objective
                                        dry-bulb,     relative      temp,        temp,        temp,
                                          [deg]F    humidity, %     [deg]F       [deg]F       [deg]F
--------------------------------------------------------------------------------------------------------------------------------------------------------
Off Cycle Fan Power..................          -10          <50  ...........  ...........  ...........  Compressor Off.........  Measure fan input power
                                                                                                                                  during compressor off
                                                                                                                                  cycle.
Refrigeration Capacity Suction A.....          -10          <50          -20           38            5  Compressor On..........  Determine Net
                                                                                                                                  Refrigeration Capacity
                                                                                                                                  of Unit Cooler.
Defrost..............................          -10      Various  ...........  ...........  ...........  Compressor Off.........  Test according to
                                                                                                                                  Appendix C Section
                                                                                                                                  C11.
--------------------------------------------------------------------------------------------------------------------------------------------------------
Note: Superheat to be set according to equipment specification in equipment or installation manual. If no superheat specification is given, a default
  superheat value of 6.5 [deg]F shall be used. The superheat setting used in the test shall be reported as part of the standard rating.


[[Page 83932]]

    (3) Representations. HTPG may not make representations about the 
energy efficiency of a basic model listed in paragraph (1) of this 
Interim Waiver Order for compliance, marketing, or other purposes 
unless the basic model has been tested in accordance with the 
provisions set forth in this alternate test procedure and such 
representations fairly disclose the results of such testing.
    (4) This Interim Waiver Order shall remain in effect according to 
the provisions of 10 CFR 431.401.
    (5) This Interim Waiver Order is issued on the condidion that the 
statements and representations provided by HTPG are valid. If HTPG 
makes any modifications to the controls or configurations of a basic 
model subject to this Interim Waiver Order, such modifications will 
render the waiver invalid with respect to that basic model, and HTPG 
will either be required to use the current Federal test method or 
submit a new application for a test procedure waiver. DOE may rescind 
or modify this waiver at any time if it determines the factual basis 
underlying the petition for the Interim Waiver Order is incorrect, or 
the results from the alternate test procedure are unrepresentative of 
the basic model's true energy consumption characteristics. 10 CFR 
431.401(k)(1). Likewise, HTPG may request that DOE rescind or modify 
the Interim Waiver Order if HTPG discovers an error in the information 
provided to DOE as part of its petition, determines that the interim 
waiver is no longer needed, or for other appropriate reasons. 10 CFR 
431.401(k)(2).
    (6) Issuance of this Interim Waiver Order does not release HTPG 
from the applicable requirements set forth at 10 CFR part 429.
    DOE makes decisions on waivers and interim waivers for only those 
basic models specifically set out in the petiion, not future models 
that may be manufactured by the petitioner. HTPG may submit a new or 
amended petition for waiver and rerquest for grant of interim waiver, 
as appropriate, for additional basic models of CO<INF>2</INF> direct 
expansion unit coolers. Alternatively, if appropriate, HTPG may 
rerquest that DOE extend the scope of a waiver or an interim waiver to 
include additional basic models employing the same technology as the 
basic model(s) set forth in the original petition consistent with 10 
CFR 431.401(g).

    Signed in Washington, DC, on November 24, 2020.
Alexander N. Fitzsimmons,
Deputy Assistant Secretary for Energy Efficiency, Energy Efficiency and 
Renewable Energy.
BILLING CODE 6450-01-P

[[Page 83933]]

[GRAPHIC] [TIFF OMITTED] TN23DE20.006

BILLING CODE 6450-01-C
July 6, 2020

    The design characteristics constituting the grounds for the Waiver 
and Interim Waiver Application:
    <bullet> Appendix C to Subpart R of Part 431--Uniform Test Method 
for the Measurement of Net Capacity and AWEF of Walk-in Cooler and 
Walk-in Freezer Refrigeration Systems specifies that unit coolers 
tested alone use the test procedures described in AHRI 1250-2009. Table 
15 and Table 16 of AHRI 1250-2009 are as follows:

[[Page 83934]]



                                                           Table 15--Refrigerator Unit Cooler
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                       Unit cooler  Unit cooler                  Liquid       Liquid
                                           air          air       Saturated      inlet        inlet
           Test description              entering     entering     suction     saturation   subcooling    Compressor  capacity        Test objective
                                        dry-bulb,     relative      temp,        temp,        temp,
                                          [deg]F    humidity, %     [deg]F       [deg]F       [deg]F
--------------------------------------------------------------------------------------------------------------------------------------------------------
Off Cycle Fan Power..................           35          <50  ...........  ...........  ...........  Compressor Off.........  Measure fan input power
                                                                                                                                  during compressor off
                                                                                                                                  cycle.
Refrigeration Capacity Suction A.....           35          <50           25          105            9  Compressor On..........  Determine Net
                                                                                                                                  Refrigeration Capacity
                                                                                                                                  of Unit Cooler.
Refrigeration Capacity Suction B.....           35          <50           20          105            9  Compressor On..........  Determine Net
                                                                                                                                  Refrigeration Capacity
                                                                                                                                  of Unit Cooler.
--------------------------------------------------------------------------------------------------------------------------------------------------------


                                                              Table 16--Freezer Unit Cooler
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                       Unit cooler  Unit cooler                  Liquid       Liquid
                                           air          air       Saturated      inlet        inlet
           Test description              entering     entering     suction     saturation   subcooling    Compressor  capacity        Test objective
                                        dry-bulb,     relative      temp,        temp,        temp,
                                          [deg]F    humidity, %     [deg]F       [deg]F       [deg]F
--------------------------------------------------------------------------------------------------------------------------------------------------------
Off Cycle Fan Power..................          -10          <50  ...........  ...........  ...........  Compressor Off.........  Measure fan input power
                                                                                                                                  during compressor off
                                                                                                                                  cycle.
Refrigeration Capacity Suction A.....          -10          <50          -20          105            9  Compressor On..........  Determine Net
                                                                                                                                  Refrigeration Capacity
                                                                                                                                  of Unit Cooler.
Refrigeration Capacity Suction B.....          -10          <50          -26          105            9  Compressor On..........  Determine Net
                                                                                                                                  Refrigeration Capacity
                                                                                                                                  of Unit Cooler.
Defrost..............................          -10      Various  ...........  ...........  ...........  Compressor Off.........  Test according to
                                                                                                                                  Appendix C Section
                                                                                                                                  C11.
--------------------------------------------------------------------------------------------------------------------------------------------------------

    <bullet> CO<INF>2</INF> refrigerant has a critical temperature of 
87.8 [deg]F thus the liquid inlet saturation temperature of 105 [deg]F 
and the liquid inlet subcooling temperature of 9 [deg]F as specified in 
Table 15 and Table 16 are not achievable.
    <bullet> The test condition values need to be more in line with 
typical operating conditions for a transcritical CO<INF>2</INF> booster 
system.

    Basic Models on which the Waiver and Interim Waiver is being 
requested (All Russell Brand):

     RL6A041ADAF        RL6A041DDAF        RL6A052ADAF        RL6A052DDAF        RL6A066ADAF        RL6A066DDAF
     RL6A073ADAF        RL6A073DDAF        RL6A094ADAF        RL6A094DDAF        RL6A117ADAF        PL6A117DDAF
     RL6A130ADAF        RL6A130DDAF        RL6A141ADAF        RL6A141DDAF        RL6A161ADAF        RL6A161DDAF
     RL6A181ADAF        RL6A181DDAF        RL6A195ADAF        RL6A195DDAF        RL6A235ADAF        RL6A235DDAF
     RL6A260ADAF        RL6A260DDAF        RL6A295ADAF        RL6A295DDAF        RL6A330ADAF        RL6A330DDAF
     RL6A390ADAF        RL6A390DDAF        RL6E035DDAF        RL6E042DDAF        RL6E049DDAF        RL6E066DDAF
     RL6E077DDAF        RL6E090DDAF        RL6E105DDAF        RL6E121DDAF        RL6E142DDAF        RL6E162DDAF
     RL6E182DDAF        RL6E200DDAF        RL6E200EDAF        RL6E244DDAF        RL6E244EDAF        RL6E281DDAF
     RL6E281EDAF        RL4E027DDAF        RL4E032DDAF        RL4E038DDAF        RL4E051DDAF        RL4E064DDAF
     RL4E080DDAF        RL4E094DDAF        RL4E110DDAF        RL4E125DDAF        RL4E141DDAF        RL4E155DDAF
     RL4E155EDAF        RL4E195DDAF        RL4E195EDAF        RL4E230DDAF        RL4E230EDAF
 
     RM6A182ADAF        RM6A182DDAF        RM6A182FDAF        RM6A220ADAF        RM6A220DDAF        RM6A220FDAF
     RM6A276ADAF        RM6A276DDAF        RM6A276FDAF        RM6A370ADAF        RM6A370DDAF        RM6A370FDAF
     RM6A442ADAF        RM6A442DDAF        RM6A442FDAF        RM6A549ADAF        RM6A549DDAF        RM6A549FDAF
     RM6A658ADAF        RM6A658DDAF        RM6A658FDAF        RM6E153DDAF        RM6E153EDAF        RM6E153FDAF
     RM6E153GDAF        RM6E184DDAF        RM6E184EDAF        RM6E184FDAF        RM6E184GDAF        RM6E311DDAF
     RM6E311EDAF        RM6E311FDAF        RM6E311GDAF        RM6E374DDAF        RM6E374EDAF        RM6E374FDAF
     RM6E374GDAF        RM6E469EDAF        RM6E469FDAF        RM6E469GDAF        RM6E564EDAF        RM6E564FDAF
     RM6E564GDAF        RM4E110DDAF        RM4E110EDAF        RM4E110FDAF        RM4E110GDAF        RM4E143DDAF
     RM4E143EDAF        RM4E143FDAF        RM4E143GDAF        RM4E232DDAF        RM4E232EDAF        RM4E232FDAF
     RM4E232GDAF        RM4E288DDAF        RM4E288EDAF        RM4E288FDAF        RM4E288GDAF        RM4E336EDAF
     RM4E336FDAF        RM4E336GDAF        RM4E419EDAF        RM4E419FDAF        RM4E419GDAF
 
     RV6A043ADAF        RV6A043DDAF        RV6A053ADAF        RV6A053DDAF        RV6A085ADAF        RV6A085DDAF
     RV6A106ADAF        RV6A106DDAF        RV6A129ADAF        RV6A129DDAF        RV6A158ADAF        RV6A158DDAF
     RV6A176ADAF        RV6A176DDAF        RV6A218ADAF        RV6A218DDAF        RV6A271ADAF        RV6A271DDAF
     RV6E043DDAF        RV6E053DDAF        RV6E085DDAF        RV6E106DDAF        RV6E129DDAF        RV6E158DDAF
     RV6E176DDAF        RV6E218DDAF        RV6E271DDAF
 
   ASLA25048ADAF      ASLA25048DDAF      ASLA25061ADAF      ASLA25061DDAF      ASLA35073ADAF      ASLA35073DDAF
   ASLA45098ADAF      ASLA45098DDAF      ASLA55122ADAF      ASLA55122DDAF      ASLA65158ADAF      ASLA65158DDAF
   ASLE25048DDAF      ASLE25058DDAF      ASLE35070DDAF      ASLE45094DDAF      ASLE55117DDAF      ASLE65150DDAF
 
     RE6A041ADAF        RE6A041DDAF        RE6A070ADAF        RE6A070DDAF        RE6A084ADAF        RE6A084DDAF
     RE6A104ADAF        RE6A104DDAF        RE6A128ADAF        RE6A128DDAF        RE6A141ADAF        RE6A141DDAF
     RE6A169ADAF        RE6A169DDAF        RE6A204ADAF        RE6A204DDAF        RE6A258ADAF        RE6A258DDAF
     RE6E037DDAF        RE6E045DDAF        RE6E075DDAF        RE6E089DDAF        RE6E108DDAF        RE6E125DDAF
     RE6E137DDAF        RE6E182DDAF        RE6E221DDAF        RE6E278DDAF        RE4E037DDAF        RE4E075DDAF
     RE4E107DDAF        RE4E149DDAF        RE4E186DDAF        RE4E234DDAF
 
     RH6A031DDAF        RH6A031FDAF        RH6A043DDAF        RH6A043FDAF        RH6A052DDAF        RH6A052FDAF
     RH6A063DDAF        RH6A063FDAF        RH6A087DDAF        RH6A087FDAF        RH6A105DDAF        RH6A105FDAF

[[Page 83935]]

 
     RH6A132DDAF        RH6A132FDAF        RH6A156DDAF        RH6A156FDAF        RH6A175DDAF        RH6A175FDAF
     RH6A209DDAF        RH6A209FDAF        RH6E033DDAF        RH6E033EDAF        RH6E033FDAF        RH6E033GDAF
     RH6E044DDAF        RH6E044EDAF        RN6E044FDAF        RH6E044GDAF        RH6E053DDAF        RH6E053EDAF
     RH6E053FDAF        RH6E053GDAF        RH6E066DDAF        RH6E066EDAF        RH6E066FDAF        RH6E066GDAF
     RH6E089DDAF        RH6E089EDAF        RH6E089FDAF        RH6E089GDAF        RH6E109DDAF        RH6E109EDAF
     RH6E109FDAF        RH6E109GDAF        RH6E134DDAF        RH6E134EDAF        RH6E134FDAF        RH6E134GDAF
     RH6E163DDAF        RH6E163EDAF        RH6E163FDAF        RH6E163GDAF        RH6E199DDAF        RH6E199EDAF
     RH6E199FDAF        RH6E199GDAF        RH4E035DDAF        RH4E035EDAF        RH4E035FDAF        RH4E035GDAF
     RH4E044DDAF        RH4E044EDAF        RH4E044FDAF        RH4E044GDAF        RH4E071DDAF        RH4E071EDAF
     RH4E071FDAF        RH4E071GDAF        RH4E087DDAF        RH4E087EDAF        RH4E087FDAF        RH4E087GDAF
     RH4E107DDAF        RH4E107EDAF        RH4E107FDAF        RH4E107GDAF        RH4E131DDAF        RH4E131EDAF
     RH4E131FDAF        RH4E131GDAF        RH4E167DDAF        RH4E167EDAF        RH4E167FDAF        RH4E167GDAF
 

    Specific Requirement sought to be waived--Petitioning for a waiver 
and interim waiver to exempt CO<INF>2</INF> Direct Expansion Unit 
Coolers in Medium and Low Temperature application from being tested to 
the current test procedure. The prescribed test procedure is not 
appropriate for these products for the reasons stated previously 
(liquid inlet saturation temperature and liquid inlet subcooling 
temperature test condition values are not appropriate for a 
transcritical CO<INF>2</INF> booster system application).
    List of manufacturers of all other basic models marketing in the 
United States and known to the petitioner to incorporate similar design 
characteristics--

Manufacturer: Heatcraft Refrigeration Products
Manufacturer: Keeprite Refrigeration
Manufacturer: Hussmann/Krack Refrigeration

    Proposed alternate test procedure:
    1. Utilize the test procedure as outlined in Appendix C to Subpart 
R of Part 431--Uniform Test Method for the Measurement of Net Capacity 
and AWEF of Walk-in Cooler and Walk-in Freezer Refrigeration Systems 
with the exception of modifying the test conditions in Table 15 and 16 
for liquid inlet saturation temperature and liquid inlet subcooling 
temperature as noted below. In addition, per Appendix C to Subpart R of 
431 use the calculations in AHRI 1250 section 7.9 to determine AWEF and 
net capacity for unit coolers matched to parallel rack systems. Use 
AHRI 1250 Table 17, EER for Remote Commercial Refrigerated Display 
Merchandisers and Storage Cabinets to determine the power consumption 
of the system.

                                                           Table 15--Refrigerator Unit Cooler
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                       Unit cooler  Unit cooler                  Liquid       Liquid
                                           air          air       Saturated      inlet        inlet
           Test description              entering     entering     suction     saturation   subcooling    Compressor  capacity        Test objective
                                        dry-bulb,     relative      temp,        temp,        temp,
                                          [deg]F    humidity, %     [deg]F       [deg]F       [deg]F
--------------------------------------------------------------------------------------------------------------------------------------------------------
Off Cycle Fan Power..................           35          <50  ...........  ...........  ...........  Compressor Off.........  Measure fan input power
                                                                                                                                  during compressor off
                                                                                                                                  cycle.
Refrigeration Capacity Suction A.....           35          <50           25           38            5  Compressor On..........  Determine Net
                                                                                                                                  Refrigeration Capacity
                                                                                                                                  of Unit Cooler.
--------------------------------------------------------------------------------------------------------------------------------------------------------


                                                              Table 16--Freezer Unit Cooler
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                       Unit cooler  Unit cooler                  Liquid       Liquid
                                           air          air       Saturated      inlet        inlet
           Test description              entering     entering     suction     saturation   subcooling    Compressor  capacity        Test objective
                                        dry-bulb,     relative      temp,        temp,        temp,
                                          [deg]F    humidity, %     [deg]F       [deg]F       [deg]F
--------------------------------------------------------------------------------------------------------------------------------------------------------
Off Cycle Fan Power..................          -10          <50  ...........  ...........  ...........  Compressor Off.........  Measure fan input power
                                                                                                                                  during compressor off
                                                                                                                                  cycle.
Refrigeration Capacity Suction A.....          -10          <50          -20           38            5  Compressor On..........  Determine Net
                                                                                                                                  Refrigeration Capacity
                                                                                                                                  of Unit Cooler.
Defrost..............................          -10      Various  ...........  ...........  ...........  Compressor Off.........  Test according to
                                                                                                                                  Appendix C Section
                                                                                                                                  C11.
--------------------------------------------------------------------------------------------------------------------------------------------------------

    Success of the application for Waiver and interim Waiver will: 
Ensure that manufacturers of CO<INF>2</INF> Direct Expansion Unit 
Coolers in Medium and Low Temperature application can continue to 
participate in the market.
    What economic hardship and/or competitive disadvantage is likely to 
result absent a favorable determination on the Application for Waiver 
and Interim Waiver--Economic hardship will be loss of sales due to not 
meeting the DOE requirements set forth.
    Conclusion:
    Heat Transfer Products Group respectfully requests that DOE grant 
this petition for a Waiver and Interim Waiver from DOE's current 
requirement to test CO<INF>2</INF> direct expansion unit coolers.

/s/

Michael Straub,
Director, Engineering and Product Development.
[FR Doc. 2020-26322 Filed 12-22-20; 8:45 am]
BILLING CODE 6450-01-P


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