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Federal Register / Vol. 86, No. 31 / Thursday, February 18, 2021 / Notices
accurate measurement of energy efficiency of the specified basic models, while alleviating the testing issues associated with Hussmanns implementation of walk-in cooler and walk-in freezer testing for these basic models. Review of the CO2 refrigeration market confirms that the test conditions of the testing approach suggested by Hussmann would be representative for operation of a unit cooler used in a transcritical CO2 booster system. CO2
that is cooled in the gas cooler of a transcritical booster system expands through a high-pressure control valve that delivers CO2 to a subcriticalpressure 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 mediumand low-temperature systems in Hussmanns suggested test approach. Calculations on other external CO2 refrigeration system designs in the market indicate that the 38 F liquid unit cooler inlet saturation temperature suggested by Hussmann is representative of CO2 booster systems Hussmann, No.5. Regarding use of the EER values in AHRI 12502009 Table 17

to determine the representative compressor power consumption for CO2
unit cooler systems, research into the performance of different configurations of CO2 booster systems shows that enhanced CO2 cycles like those used in transcritical booster systems can match conventional refrigerants in average annual efficiency Hussmann, No. 2.
The findings from this research, along with the other collective factors previously noted, justifies the use of the EER values in AHRI 12502009 Table 17
for determining the power consumption for CO2 booster system evaporators, despite these EER values being initially established for systems using conventional refrigerants. Consequently, DOE has determined that Hussmanns petition for waiver likely will be granted. Furthermore, DOE has determined that it is desirable for public policy reasons to grant Hussmann immediate relief pending a determination of the petition for waiver.
For the reasons stated, it is ordered that:
1 Hussmann must test and rate the following CO2 direct expansion unit cooler basic models with the alternate test procedure set forth in paragraph 2.

Basic Models for Which a Waiver is Requested:
Manufacturer Hussmann Hussmann Hussmann Hussmann
Brand

Krack Krack Krack Krack

Basic model KRD-C.
GD-C.
LHD-C.
MKD-C.

2 The Hussmann basic models identified in paragraph 1 of this Interim Waiver Order shall be tested according to the test procedure for walkin 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 F and 5 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 DOEs 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 15REFRIGERATOR UNIT COOLER
Unit cooler air entering dry-bulb, F

Unit cooler air entering relative humidity, %

Off Cycle Fan Power

35

Refrigeration Capacity Suction A

35

Test description
Saturated suction temp, F

Liquid inlet saturation temp, F

Liquid inlet subcooling temp, F

<50

Compressor Off <50

25

38

5

Compressor On
Compressor capacity
Test objective
Measure fan input power during compressor off cycle.
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 F shall be used. The superheat setting used in the test shall be reported as part of the standard rating.

TABLE 16FREEZER UNIT COOLER
Unit cooler air entering dry-bulb, F

Unit cooler air entering relative humidity, %

Off Cycle Fan Power

10

Refrigeration Capacity Suction A
Defrost

Test description
Saturated suction temp, F

Liquid inlet saturation temp, F

Liquid inlet subcooling temp, F

<50

Compressor Off
10

<50

20

38

5

Compressor On
10

Various

Compressor Off
Compressor capacity
Test objective
Measure fan input power during compressor off cycle.
Determine Net Refrigeration Capacity of Unit Cooler.
Test according to Appendix C
Section C11.

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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 F shall be used. The superheat setting used in the test shall be reported as part of the standard rating.

3 Representations. Hussmann 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
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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 condition that the statements and representations provided by Hussmann are valid. If Hussmann
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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 Hussmann will either be required to use the current Federal test method or submit a new application for a test procedure waiver. DOE may
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