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Federal Register / Vol. 86, No. 134 / Friday, July 16, 2021 / Proposed Rules TABLE II.11REPRESENTATIVE WALK-IN DOORS EVALUATED IN JUNE 2014 ECS FINAL RULE
Utility
Temperature
Representative unit size
Dimensions height x length, ft
Window area ft2
for non-display doors
Display Door

Cooler

Small
Medium
Large
Small
Medium
Large
Small
Medium
Large
Small
Medium
Large
Small
Medium
Large
Small
Medium
Large

5.25 x 2.25
6.25 x 2.25
7 x 3
5.25 x 2.25
6.25 x 2.25
7 x 3
6.5 x 2.5
7 x 3
7.5 x 4
6.5 x 2.5
7 x 3
7.5 x 4
8 x 5
9 x 7
12 x 7
8 x 5
9 x 7
12 x 7

2.25
2.25
2.25
2.25
2.25
2.25
2.25
4.00
4.00
2.25
4.00
4.00

Freezer
Passage Door

Cooler
Freezer

Freight Door

Cooler
Freezer

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See section 5.3.1 at p. 53 of the TSD for the June 2014 ECS final rule, Docket EERE2008BTSTD00150131.

For the 2014 ECS final rule, DOE only analyzed single-width display doors as representative units in the engineering analysis. However, many display doors are sold as multi-door configurations with 2-, 3-, 4-, or 5-door openings encapsulated within one outer frame.
The relationship of energy use for a single-width display door may not linearly extrapolate for multi-door configurations. For example, a singlewidth door may include two light fixtures, one on each side of the door opening, whereas additional doors may add one light fixture per door opening.
Thus, a single-width door of equal area to a double-width door would use less lighting power than the double-width door, despite being equal in area.
Issue 16: DOE requests feedback on the representative units for display doors used for the 2014 ECS final rule engineering analysis and whether multidoor configurations should be included as representative units. If so, DOE seeks comment on panel size and the number of panels that would be most representative for multi-door configurations. Additionally, DOE seeks specific data on the appropriate number of door openings and door sizes to consider and the additional electrical component power e.g., anti-sweat heater power, lighting, etc. required for each additional door opening. DOE is also interested in any other differences between single-door and multi-door configurations that would impact energy use.
In the June 2021 TP RFI, DOE
requested feedback on the current definitions of passage and freight doors and whether there were any attributes,
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including size, which distinguish them from each other. 86 FR 32332, 32335.
Issue 17: DOE seeks comment on the appropriateness of the representative units chosen for the previous analysis of passage and freight doors. DOE requests specific feedback on what the minimum and maximum sizes of both passage and freight doors are and if there are other attributes besides size which differentiate passage doors from freight doors and vice versa.
As discussed in the June 2021 TP RFI, DOE received multiple test procedure waivers requesting to increase the percent time off PTO for motorized walk-in door openers. 86 FR 32332, 32338. In the engineering analysis for the June 2014 ECS final rule, the representative units of walk-in doors analyzed did not include motorized door openers. DOE is considering whether motorized door openers should be considered in its representative models.
Issue 18: DOE seeks comment on the prevalence of motorized door openers for both display and non-display doors.
DOE requests specific feedback on the prevalence of motorized door openers by equipment class, the minimum door size that might have a motorized door opener, the percentage of doors sold which typically include a motorized door opener, and any data relating power of a motorized door opener to door size.
2. Refrigeration Systems a. Technology Options A complete list of technology options evaluated for refrigeration systems in
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preparation for the June 2014 ECS final rule and July 2017 ECS final rule is presented in Table II.12.31 Table II.13
lists additional technology options that DOE may consider in a future WICF
energy conservation standard.

TABLE II.12TECHNOLOGY OPTIONS
CONSIDERED FOR WICF REFRIGERATION SYSTEMS IN THE JUNE
2014 ECS FINAL RULE AND JULY
2017 ECS FINAL RULE
Component
Technology options
Refrigeration Systems

Energy storage systems.
Refrigeration system override.
Automatic evaporator fan shut-off.
Improved evaporator and condenser fan blades.
Improved evaporator and condenser coils.
Evaporator fan control.
Ambient sub-cooling.
Higher-efficiency fan motors.
Higher-efficiency compressors.
Variable-speed compressors.
Liquid suction heat exchanger.
Adaptive Defrost.
Hot gas defrost.
Floating head pressure.
Condenser fan control.
Economizer cooling.

31 See sections 3.3.1 and 3.3.73.3.10 at pp. 324
through 325 and 330 through 333 of the TSD for the June 2014 ECS final rule. Docket EERE2008
BTSTD00150131. See section 3.3 at pp. 314
through 318 of the TSD for the July 2017 ECS final rule. Docket EERE2015BTSTD00160099.

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