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Federal Register / Vol. 86, No. 134 / Friday, July 16, 2021 / Proposed Rules
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TABLE II.13POTENTIAL NEW TECHare additional technologies that apply to designing their equipment and the NOLOGY OPTIONS FOR WICF REwine cellar refrigeration systems that are utility advantages and disadvantages of not mentioned in Table II.12 or Table scroll versus semi-hermetic compressors FRIGERATION SYSTEMS
Component
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Refrigeration Systems

Technology options Improved Thermal Insulation.
Crankcase Heater Controls.
Refrigerant.

As discussed in sections II.A.2, II.A.3, and II.A.4 of this document, DOE is interested specifically in hightemperature freezers, single-package refrigeration systems, and wine cellar refrigeration systems and how their particular applications may influence the use of the technology options listed in Table II.12 and Table II.13 of this document.
Issue 19: DOE requests comment on whether there are technology options or other design features that would be unique to high-temperature freezer refrigeration systems i.e., mediumtemperature systems operating at a temperature between 10 F to 32 F as compared to technology options or design features for medium-temperature refrigeration systems operating at abovefreezing cooler temperatures. If hightemperature freezer refrigeration systems have certain unique features, DOE seeks information on those features and how they impact refrigeration system performance.
As discussed in section II.A.3 and II.A.4 of this document, single-package and wine cellar refrigeration systems have structural designs different from other walk-in split systems. Due to differences in design, DOE expects that the design options for these products may be different from dedicated condensing units and unit coolers sold separately.
Issue 20: DOE requests comment on which of the technology options listed in Table II.12 and Table II.13 of this document are available and used in single-package refrigeration systems.
DOE also requests comment on whether there are other technologies that apply to single-package refrigeration systems not mentioned in Table II.12 or Table II.13 of this document. Additionally, DOE requests comment on which technology options are feasible for dedicated condensing systems and unit coolers but may not be feasible for single-packaged refrigeration systems due to structural design constraints.
Issue 21: DOE requests comment on which of the technology options listed in Table II.12 and Table II.13 of this document are available and used in wine cellar refrigeration systems. DOE
also seeks information on whether there
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II.13 of this document. Additionally, DOE requests comment on the specific design constraints for wine cellar refrigeration systems and how these constraints may impact the use of certain technology options.
In the July 2017 ECS final rule, DOE
considered and ultimately screened out improved compressor technology options, such as multiple-capacity or variable-capacity compressors. 82 FR
31808, 31839. The current DOE test procedure does not allow testing of multiple-capacity or variable-capacity systems using the condenser-alone rating method. Although the test procedure does have provisions for testing multiple-capacity and variablecapacity matched-pair refrigeration systems, DOE did not analyze matchedpair systems in the engineering analysis and thus did not further consider this option. 82 FR 31808, 31839. DOE
requested information and comment on testing multiple-capacity and variablecapacity compressors in the June 2021
TP RFI. 86 FR 32332, 3234832349.
Issue 22: DOE seeks information on the availability of multiple-capacity or variable-capacity compressors in the current market. DOE is also interested in any end-user requirements that may restrict the use of, or reduce the potential benefits of, multior variablecapacity compressors in the field.
In the July 2017 ECS final rule, DOE
evaluated scroll compressors for smaller capacity systems capacities between 6,000 Btu/h and 25,000 Btu/h and semi-hermetic compressors for larger capacity systems capacities between 25,000 Btu/h and 72,000 Btu/h. 82 FR
31808, 3183731838. For most evaluated representative capacities, DOE assigned the expected compressor type and did not evaluate compressor type as a design option. At the 25,000
Btu/h overlap representative capacity, DOE applied a blended analysis, but also did not consider compressor type as a design option for efficiency improvement. However, DOE is aware that some compressor types are more efficient than others. For example, a preliminary evaluation of DOEs CCMS
database indicates that for those reported models with an AWEF value higher than the minimum standard, low-temperature dedicated condensing units less than 25,000 Btu/h with semi-hermetic compressors have reported AWEF values six percent, on average, higher than similar units that use a scroll compressor. DOE is interested in understanding how manufacturers select compressors when
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over a range of capacities for which both compressors types could be considered.
Issue 23: DOE requests comment on the relative efficiency difference between scroll and semi-hermetic compressors in the range of capacities in which both are available. DOE also requests comment on other design parameters that would lead a manufacturer to select a certain compressor design over another and would represent potential utility differences of different compressor designs, specifically, 1 compressor weight relative to the final equipment weight and its impact on equipment shipping, installation, and end-use; 2
compressor durability, equipment warranty, and equipment lifetime; and 3 any other relevant differences.
DOE is also interested in understanding if other higher efficiency single-capacity compressors have become available for use in walk-in systems since the last rulemaking. For instance, DOE is interested in information on whether some compressors are more efficient than others at certain walk-in capacity ranges or operating conditions..
Issue 24: DOE seeks information on the availability and efficiencies of single-speed compressors e.g., scroll compressors, rotary compressors, semihermetic compressors that were not available or were not considered in the analysis during the rulemaking finalized in 2017. Additionally, DOE is interested in understanding the availability of rotary compressors for use in singlepackage and wine cellar refrigeration systems.
As shown in Table II.13 of this document, DOE is investigating crankcase heater controls to understand how they are used in, and the field requirements for, outdoor walk-in refrigeration systems. There are several types of crankcase heater control systems that are available on the market for other types of equipment, specifically, central air conditioners and heat pumps CACs. The technical support document from the direct final rule amending standards for CACs published on January 6, 2017 CAC
2017 direct final rule provides descriptions of different crankcase heater control systems.32

32 See sections 3.4.1 at p. 334 of the TSD for the CAC 2014 direct final rule. Docket EERE2014BT
STD00480098. The docket and supporting materials for the CAC 2017 direct final rule can be accessed at www.regulations.gov/docket/EERE2014-BT-STD-0048.

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