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Federal Register / Vol. 86, No. 115 / Thursday, June 17, 2021 / Proposed Rules stand-alone unit coolers, and standalone condensing units to which a hot gas defrost-specific test procedure would apply. DOE requests comment on which methods for determining energy and heat load i.e., testing, calculation, or both would be most appropriate for each refrigeration system and why. DOE
requests comment on the methods related to hot gas defrost systems in AHRI 1250- 2020. Finally, DOE requests data to help quantify the relationship between hot gas defrost heat load addition and energy consumption versus capacity and/or to confirm the relationships provided in the AHRI
12502020 test methods for hot gas defrost.
Issue 40: DOE requests comment on how the performance of adaptive defrost systems should be accounted for in the walk-in test procedure and which refrigeration systems i.e., matchedpairs, stand-alone unit coolers, and stand-alone condensing units should be evaluated under a potential adaptive defrost test procedure. Specifically, DOE
requests data showing the performance of adaptive defrost systems relative to non-controlled defrost systems, including impacts to on-cycle operation.
DOE requests data demonstrating seasonal and daily frosting patterns for walk-in applications.
Issue 41: DOE requests information and data on whether the off-cycle methods included in AHRI 12502020
provide a representative and repeatable measure of the off-cycle power use for matched pairs, single-package systems, and also for unit coolers and/or condensing units tested alone, and if not, what modifications are recommended. DOE also seeks information on other off-cycle mode energy-consuming components that are not currently addressed by AHRI 1250
2020. In addition to identifying all offcycle mode energy-consuming components, DOE seeks information on the patterns and magnitudes of energy use by each of these components during the off-cycle.
Issue 42: DOE requests input on the development of test methods that would more accurately measure the energy use performanceincluding accounting for the potential efficiency benefits of multiand variable-capacity systems both for matched-pair and stand-alone condensing unit testing. DOE seeks data
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and information showing the potential magnitude of energy savings by reducing cycling losses in these multi and variable-capacity systems. DOE
requests market information on whether there are multiand variable-capacity condensing units available on the market in addition to those already identified and the brand names and model numbers of those additional units.
Issue 43: DOE requests feedback on the three approaches discussed in this section to address high-temperature freezer walk-ins, as well as any other potential approaches not raised in this RFI.
Issue 44: DOE also requests information that would help inform the development of test procedures for hightemperature freezer refrigeration systems, should such an approach be necessary. Additionally, DOE requests whether there are specific characteristics that distinguish a hightemperature freezer refrigeration system from a medium-temperature refrigeration system, in order to better define this category of equipment.
Issue 45: DOE also requests comment on whether 10 F is the appropriate lowest end of the application range for equipment used in walk-in hightemperature freezers that cannot be tested using the 10 F freezer test condition. Furthermore, DOE requests comment on whether all mediumtemperature systems matched-pair, condensing unit, evaporator can be operated and tested at 10 F or equivalent refrigerant suction conditions, or whether there is a wide range at the low-end of the operating range that depends on the design of the system.
Issue 46: Regarding the testing of a medium-temperature refrigeration system in the high-temperature freezer range, DOE requests information on what specified test procedure parameters would need to be altered and how in order for the test to be representative of field operation. In answering, DOE requests that commenters provide the supporting reasons for any suggested recommendations. DOE requests information on whether a single standardized high-temperature freezer room condition could be appropriate for testing this group of walk-ins, and if so,
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what such an appropriate temperature would be.
Issue 47: Finally, DOE requests comment on what, if any, changes would be needed in the calculation of AWEF for high-temperature freezer operation, and why.
Issue 48: DOE requests comment on the appropriateness of using the current medium-temperature refrigeration system default fan input power equation found at section 3.4.2.2 of Appendix C
to represent the fan input power of hightemperature freezer refrigeration systems. If the current mediumtemperature refrigeration system default fan input power equation is not representative of the fan input power for high-temperature freezer refrigeration systems, DOE requests suggestions for a more appropriate equation, or alternative relationships to consider, as well as any relevant data.
Issue 49: DOE requests information or data that would indicate whether and how the equations used to calculate daily defrost energy use and heat addition in the test procedure should be modified for high-temperature freezer refrigeration systems rated as standalone condensing units e.g., defrost heater wattage and daily energy use as a function of capacity for a 10 F walkin temperature. If testing at the lowest application temperature is adopted, DOE requests comment on how the defrost equations should be modified to account for each model being tested at different conditions, and why. DOE
requests information on whether frost loads and/or defrost frequency are different for high-temperature freezers than for 10 F freezers. DOE requests that commenters include any available supporting information when responding.
Issue 50: DOE requests comment on the appropriateness of specifying refrigerant temperatures in terms of mid-point or a modified mid-point, rather than dew point, which is currently used. DOE seeks feedback on potential definitions to use for a modified mid-point temperature as applied to WICF refrigeration system testing. In addition, DOE requests comments on what other factors should be considered when modifying the refrigeration system test conditions from dew point to mid-point or modified mid-point specifications.

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