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Federal Register / Vol. 86, No. 134 / Friday, July 16, 2021 / Proposed Rules
alone. 81 FR 95758, 9577495777, see also section 3.5 of appendix C to subpart R of 10 CFR part 431. In a test procedure final rule published on March 26, 2021
March 2021 TP final rule, DOE
updated the defrost energy use and thermal load equations for hot gas defrost unit coolers tested alone to provide a consistent performance evaluation between hot gas defrost and electric defrost unit coolers when tested alone. 86 FR 16027, 16030. However, this approach does not measure or account for actual hot gas defrost thermal load and energy use. 81 FR
95758, 9577495777.
As discussed in the June 2021 TP RFI, defrost heat and energy values specific to hot gas defrost units are included in the most recent industry test method, 2020 Standard for Performance Rating of Walk-In Coolers and Freezers, AHRI 12502020. 86 FR 32332, 32347. Similar to the current approach for adaptive defrost, DOE could allow walk-in refrigeration systems with hot gas defrost to qualitatively represent improved efficiency performance solely
for marketing purposes and not for demonstrating compliance with the current standards. Hot gas defrost could also be used to demonstrate compliance with energy conservation standards.
DOE could also include hot gas defrost as a design option in its analysis for setting new energy conservation standards.
Issue 32: DOE requests stakeholder feedback on how to address hot gas defrost in a future rulemaking.
Specifically, DOE is interested in data that support whether DOE should continue to screen hot gas defrost from its engineering analysis, and if not, DOE
is interested in understanding whether hot gas defrost functionality and cost burden should be included in its analysis of dedicated condensing units or in its analysis of unit coolers. DOE
additionally requests comment on how the screening results presented in Table II.14 of this document have changed for hot gas defrost, such that the approaches used in the prior rulemaking analyses may no longer be appropriate.

c. Representative Units In the June 2014 ECS final rule and July 2017 ECS final rule, DOE analyzed the representative refrigeration system capacities presented in Table II.15. 79
FR 32050, 37073 and 82 FR 31808, 31835. However, data retrieved from DOEs CCMS database 15 indicates that:
For outdoor medium-temperature dedicated condensing units, 39 percent of certified units have a nominal capacity greater than 96,000 Btu/h and 19 percent of certified units have a capacity greater than 200,000 Btu/h;
For low-temperature unit coolers, 48 percent of certified units have a rated capacity of greater than 40,000 Btu/h and 19 percent are rated at greater than 100,000 Btu/h;
For medium-temperature unit coolers, 55 percent of certified units have a nominal capacity greater than 24,000 Btu/h, with 16 percent rated at greater than 100,000 Btu/h.
These data are based on a count of basic models submitted to the CCMS
database and do not indicate the volume of shipments of each model.

TABLE II.15REPRESENTATIVE REFRIGERATION SYSTEM UNITS EVALUATED IN THE JUNE 2014 AND JULY 2017 ECS
FINAL RULES
Equipment class
Representative unit capacity Btu/h
Representative unit compressor type
Associated rulemaking
6,000
6,000
18,000
18,000
18,000
54,000
54,000
96,000
96,000
6,000
6,000
18,000
18,000
18,000
54,000
54,000
96,000
96,000
6,000
9,000
25,000
25,000
54,000
6,000
9,000
25,000
25,000
54,000
72,000
4,000
9,000
24,000
4,000
9,000
18,000

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June 2014 ECS final rule.

Dedicated Condensing, Medium, Indoor

Dedicated Condensing, Medium, Outdoor

Dedicated Condensing, Low, Indoor, <6,500 Btu/h
Dedicated Condensing, Low, Indoor, 6,500 Btu/h

jbell on DSKJLSW7X2PROD with PROPOSALS

Dedicated Condensing, Low, Outdoor, <6,500 Btu/h
Dedicated Condensing, Low, Outdoor, 6,500 Btu/h

Unit Cooler, Medium

Unit Cooler, Low, <15,500 Btu/h
Unit Cooler, Low, 15,500 Btu/h

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July 2017 ECS final rule.