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Federal Register / Vol. 86, No. 163 / Thursday, August 26, 2021 / Notices
an external static pressure ESP 10 of 50 percent of the maximum ESP to be specified by manufacturers for each basic model AHRI August 2020 Letter is also included. LRC Coils petition states that all basic models listed in the petition for waiver and interim waiver cannot be operated at a temperature less than 45 F and provides DOE with maximum ESP values for all ducted basic models specified in its petition.
LRC Coil 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.
10 CFR 431.401e2.

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III. Requested Alternate Test Procedure EPCA requires that manufacturers use DOE test procedures when making representations about the energy consumption and energy consumption costs of covered equipment. 42 U.S.C.
6314d Consistency is important when making representations about the energy efficiency of covered products and 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.
LRC Coil seeks to use an approach that would test and rate specific wine cellar walk-in unit cooler basic models.
The companys suggested approach specifies using an air-return temperature of 55 F, as opposed to the 35 F
requirement prescribed in the current DOE test procedure. LRC Coil also suggests using an air-return relative humidity of 55 percent, as opposed to <50 percent RH as prescribed in the current DOE test procedure. LRC Coil stated that wine cellar walk-in cooler refrigeration systems do not experience highand lowtemperature conditions, but rather operate at steady state in a predominantly air-conditioned environment, supporting the use of the correction factor to adjust for average usage. LRC Coil requested that a correction factor of 0.55 be applied to the final AWEF calculation to adjust for 10 External static pressure is the sum of all the pressure resisting the fans. In this case, this is chiefly the resistance generated by the air moving through ductwork.

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average usage.11 Finally, LRC Coil states that the external static pressure for testing systems with ducted evaporator air would be set to half of the reported maximum external static pressure.
IV. Interim Waiver Order DOE has reviewed LRC Coils application, its suggested testing approach, representations of the specified basic models on the website for the LRC Coil brand, related product catalogs, and information provided by LRC Coil and other wine cellar walk-in cooler refrigeration system manufacturers as discussed. Based on the assertions in the petition, absent an interim waiver, the DOE test procedure for walk-in cooler refrigeration systems would evaluate the subject basic models in a manner so unrepresentative of its true energy consumption characteristics as to provide materially inaccurate comparative data. Therefore, based on its review, DOE is granting an interim waiver that requires testing with a modified version of the testing approach suggested by LRC Coil.
The modified testing approach would apply to unit cooler evaporator only models specified in LRC Coils waiver petition Specified ducted basic models RMD and VAH and specified ductless basic models SLA, SLPA, DQ, LPAQ, Q, CE, HS, RM, VRM, BK, CTIH, CTE, and WM are unit coolers evaporator units designed to be paired with a remote condensing unit that is provided by a different manufacturer, in which refrigerant circulates between the evaporator unit unit cooler portion of the system and the remote condensing unit. The refrigerant cools the wine cellar air in the evaporator unit, while the condensing unit rejects heat from the refrigeration system in a remote location, often outside. The evaporator unit of the ducted unit cooler system circulates air through ducts from the wine cellar to the evaporator unit and back to provide cooling, while the evaporator unit of the ductless unit cooler system may be ceiling-mounted, installed through-the-wall, or installed inside of the wine cellar for direct cooling. The capacity range of the specified basic models is from 1,500
Btu/h to 36,000 Btu/h for the specified 11 DOE notes that in petitions for waiver received from other manufacturers, petitioners suggested that the correction factor would account for the different use and load patterns of the specified basic models as compared to walk-in cooler refrigeration systems generally. See Notifications of Petition for Waiver and Grant of Interim Waiver for Air Innovations 86
FR 2403, 2407; Jan. 12, 2021, CellarPro 86 FR
11972, 11976; Mar. 1, 2021, and Vinotheque 86 FR
11961, 11964; Mar. 1, 2021.

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operating conditions for each of the models.12
DOE considers the operating temperature range of the specified basic models to be integral to its analysis of whether such models require a test procedure waiver. Grant of the interim waiver and its alternative test procedure to the specified basic models listed in the petition is based upon the representation by LRC Coil that the operating range for the basic models listed in the interim waiver does not extend below 45 F.
The alternate test procedure specified in the Interim Waiver Order requires testing the specified basic models according to Appendix C with the following changes. The required alternate test procedure specifies an air entering dry-bulb temperature of 55 F
and a relative humidity of 55 percent.
Although not addressed by LRC Coil in its petition, the DOE test procedure for unit coolers tested alone requires use of an energy efficiency ratio EER
value,13 which is necessary to calculate the compressor energy use that would be expended to handle the walk-in unit cooler load. Appendix C, Section 3.3.1.
AHRI 12502020 section 7.8 provides an EER table to calculate AWEF for lowand medium-temperature unit coolers tested alonethe table provides varying EER values, dependent on the adjusted dew point 14 condition at the compressor inlet. However, LRC
indicated that its walk-in unit coolers operate with a 38 F evaporating temperature, which exceeds the maximum temperature in the AHRI
12502020 table. Furthermore, the EER
table represents efficiency of parallel rack systems see the title of section 7.9
of AHRI 12502009, Walk-in Unit Cooler Match to Parallel Rack System, which are typically used in supermarket 12 The specified operating conditions are 55 F
room temperature cold-side air entering, 38 F
suction temperature refrigerant saturation temperature, and 17 F TD difference between the saturation temperature of the refrigerant inside the coil and the cold-side air entering temperature. The relative humidity of the cold-side air entering is not specified. An example series of specified models with capacity and condition information can be found at Docket No. EERE 2020BTWAV0040
0007.
13 EER in this case represents the refrigeration load in British thermal units Btu/hour h required by the unit cooler divided by the compressor power in watts W required to provide that load.
14 Adjusted dew point represents the pressure level at the unit cooler exit converted to its corresponding dew point temperature and adjusted for pressure loss in the suction line returning the refrigerant to the compressor. Dew point is the warmest temperature at which a refrigerant can exist in equilibrium in a two-phase liquid-vapor state at a given pressurethe dew point represents the two-phase evaporating refrigerant temperature in the unit cooler.

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