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Federal Register / Vol. 86, No. 134 / Friday, July 16, 2021 / Proposed Rules
TABLE II.9CERTIFIED RANGES OF ANTI-SWEAT HEATER POWER PER AREA OF DOOR OPENING FOR EACH WALK-IN
DOOR EQUIPMENT CLASS
Display door, medium temperature Minimum W/ft2
Maximum W/ft2
Average W/ft2
Percent of Models without Anti-sweat Heat

Issue 12: DOE seeks specific data and information on how the physical construction of both passage and freight doors impact the amount of anti-sweat heater wire power needed to prevent condensation accumulation on any part of the door. DOE requests specific comment on any technologies that may reduce or eliminate the need for antisweat heat on passage or freight doors.
DOE also requests door design information and data that explain why many passage and freight doors are able to perform without any anti-sweat heater power in the field but some doors, specifically low-temperature passage and freight doors, still require
Display door, low temperature
Passage door, medium temperature
Passage door, low temperature
Freight door, medium temperature
Freight door, low temperature
0.00
5.59
1.37

0.00
5.39
2.99

0.00
6.80
0.42

0.00
7.08
1.15

0.00
3.40
0.11

0.00
7.00
0.16

5%

3%

60%

46%

63%

77%

anti-sweat power that is greater than that required for display doors to prevent condensation accumulation.
As stated previously, DOE may consider technology options for walk-in doors that were not considered in the June 2014 ECS final rule, specifically vacuum-insulated glass packs for display doors and windows in nondisplay doors. DOE has identified two manufacturers that produce display doors with vacuum-insulated glass packs.27
Issue 13: DOE requests comment on the prevalence of vacuum-insulated glass for walk-in doors and whether other manufacturers are considering
adopting this technology. DOE requests specific feedback on any obstacles or concerns e.g., patents, proprietary use, durability, practicability to manufacture, etc. which would prevent manufacturers from using vacuuminsulated glass in walk-in doors. DOE
also requests cost data for implementing vacuum-insulated glass in walk-in display doors.
b. Screening of Technology Options Table II.10 lists the technology options that DOE screened out for walkin doors and panels in the TSD for the June 2014 ECS final rule and the applicable screening criteria.28

TABLE II.10DOORS AND PANELS TECHNOLOGY OPTIONS SCREENED FROM THE JUNE 2014 ECS FINAL RULE
EPCA Criteria X = Basis for Screening Out Screened technology option
jbell on DSKJLSW7X2PROD with PROPOSALS

Non-electric anti-sweat systems
Automatic insulation deployment systems
Insulation thicker than 6 inches

Technological feasibility
Practicability to manufacture, install, and service
Adverse impact on product utility
Adverse impacts on health and safety
Uniquepathway proprietary technologies
X X

X

X

Issue 14: DOE requests feedback on what impact, if any, DOEs screening criteria technological feasibility;
practicability to manufacture, install, and service; adverse impacts on product utility or product availability; adverse impacts on health or safety; and uniquepathway proprietary technologies would have on each of the technology options listed in Table II.6, Table II.7, and Table II.8 of this document. DOE
also seeks information regarding how these same criteria would affect any other technology options not already identified in this document with respect to their potential use in walk-in doors and panels.

For the 2014 ECS final rule analyses, DOE screened out insulation thickness greater than six inches for panels and doors due to concerns about panels and doors becoming extremely heavy and unwieldy, long cure times for the insulation, and reduced space within the walk-in to store product.29 DOE has identified one manufacturer that markets panels with a thickness range from 2-inches to 10-inches.30
Issue 15: DOE requests comment on whether 6 inches is an appropriate upper limit for screening out insulation thickness for panels and doors. For manufacturers that produce and certify panels with insulation thicknesses
exceeding 6 inches, DOE requests feedback on what manufacturing investments have been made to do so.
For manufacturers that do not produce panels with insulation thicknesses exceeding 6 inches, DOE requests feedback on the obstacles preventing them from increasing panel thickness.

27 Product data sheets from two manufacturers that produce display doors with vacuum-insulated glass can be found at www.regulations.gov, Docket No. EERE2017BTSTD00090008 and Docket No. EERE2017BTSTD00090009.

28 See section 4.3 at p. 45 of the TSD for the June 2014 ECS final rule. Docket EERE2008BTSTD
00150131.
29 See section 4.3.5 at p. 45 of the TSD for the June 2014 ECS final rule. Docket EERE2008BT
STD00150131.

30 Technical data from one manufacturer that produces panels ranging from 2-inches to 10-inches thick can be found at www.regulations.gov, Docket No. EERE2017BTSTD00090010.

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c. Representative Units In the June 2014 ECS final rule, DOE
analyzed representative walk-in cooler and freezer doors and panels. 79 FR
32050, 3207237073. The representative walk-in doors are presented in Table II.11.

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