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Federal Register / Vol. 86, No. 134 / Friday, July 16, 2021 / Proposed Rules
non-display doors with viewing windows, as the thermal performance of the glass pack improves, the amount of anti-sweat heat required for the glass pack decreases. With a more insulative glass pack, there is a smaller temperature difference between the TABLE II.6TECHNOLOGY OPTIONS interior and exterior faces of the glass CONSIDERED FOR WICF DOORS and the interior walk-in and exterior air FROM THE JUNE 2014 ECS FINAL temperatures, resulting in less condensation on the glass. As RULE
mentioned in the TSD for the June 2014
Component Technology options ECS final rule, DOE based the amount of anti-sweat heater wire energy Display doors Non-electric anti-sweat sysconsumption on the glass packs tems.
selected.25 If a frame does not contain a Anti-sweat heater wire controls.
thermal break or has poor insulative Removal of heater wire.
properties, despite having a glass pack High-efficiency lighting.
with better insulative performance, the Lighting sensors.
door assembly may still require more Occupancy sensors.
Automatic insulation deployanti-sweat heat on the surrounding ment systems.
frame to prevent the condensation and Enhanced glass systems.
fogging issues noted earlier.
Non-Display Doors .. Increased insulation thickIssue 9: DOE seeks information on ness.
Improved insulation material.
how the physical construction of a Improved framing materials.
display door, including the glass pack Heater wire controls.
and the frame, impact the amount of Enhanced glass systems.
anti-sweat heater wire power needed to prevent condensation accumulating on TABLE II.7TECHNOLOGY OPTIONS any part of the door. Specifically, DOE
CONSIDERED FOR WICF PANELS seeks quantitative data, if available, on FROM THE JUNE 2014 ECS FINAL the change in anti-sweat heater power 1 with a specific change in door frame RULE
design but no change in glass pack Component Technology options design, 2 with a specific change in glass pack design but no change in door Panels Increased insulation frame design, and/or 3 with specific thickness.
Improved insulation machanges to the entire assembly. If there terial.
are specific design choices which are more costly but result in less or no antisweat heat, DOE requests cost data TABLE II.8POTENTIAL NEW TECHNOLOGY
OPTIONS FOR WICF based on the capability of the door to prevent condensation from forming and DOORS
the respective design options chosen.
Component Technology options DOE also requests comment on any other considerations which may impact Display and Non-Display Vacuum insulated glass.
the use and power of anti-sweat heaters.
Doors.
As stated previously, DOE is aware Walk-in doors typically use anti-sweat that some manufacturers design and heater wires to prevent 1 condensation market display doors for high-humidity applications. These doors generally from collecting on the glass, frame, or any other portion of the door, which can have anti-sweat heaters with higher puddle and be hazardous to consumers, rated power than those of standard medium-temperature display doors but 2 fogging of the glass, and 3 the collecting of condensation that may lead lower than the power required for lowtemperature display doors. For example, to doors freezing shut. DOE has observed that anti-sweat heater wires for data from the CCMS database show that doors marketed for high-humidity display doors may be placed within the applications have a range of anti-sweat door rail surrounding the glass pack heater power per door opening area and/or within the surrounding frame.
from 0.39 to 5.59 watt W/square foot For display doors, display panels, and
jbell on DSKJLSW7X2PROD with PROPOSALS

final rule and explained in the TSD are listed in Table II.6 for doors and Table II.7 for panels.24 Table II.8 lists additional technology options that DOE
may consider in a future WICF energy conservation standard.

24 See sections 3.3.3 to 3.3.6 at pp. 326 to 330
of the TSD for the June 2014 ECS final rule. Docket EERE2008BTSTD00150131.

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25 See section 5.5.2.3 at p. 519 of the TSD for the June 2014 ECS final rule. Docket EERE2008BT
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ft2, with the average being 1.66 W/
ft2. By comparison, the range of antisweat heater power is between 0 to 3.74
W/ft2 for cooler doors not marketed for high-humidity applications made by the manufacturers who also produce doors marketed for high-humidity applications, with the average being 1.01 W/ft2.
Issue 10: DOE seeks specific data and information on the correlation between relative humidity conditions at installation and the anti-sweat heater power needed to prevent condensation from accumulating on a walk-in door.
DOE is also aware that walk-in display door manufacturers may produce glass doors for other kinds of refrigeration equipment. DOE has specifically observed that some glass doors for commercial refrigeration equipment, while appearing very similar in design to their walk-in door counterparts, do not include any antisweat heaters around the door or frame.
Issue 11: DOE requests comment on the differences in design, typical conditions, and usage of a walk-in display door as compared to a display door for commercial refrigeration equipment which result in commercial refrigeration equipment door designs with no anti-sweat heaters.
Non-display doors passage and freight doors typically have better insulative properties than display doors because they have little or no glass needed for viewing purposes. Door insulation is also subject to a minimum R-value. 10 CFR 431.306a3. DOE
expects that less anti-sweat heat may be needed to prevent condensation accumulation for non-display doors because of their improved overall resistance to heat flow as compared to display doors. Certified data from DOEs CCMS database,26 presented in Table II.9, shows that passage and freight doors have lower average anti-sweat heater power per area of door opening than display doors and a higher percentage of passage and freight doors certify 0 W/ft2 of anti-sweat heater power per area of door opening than display doors. However, the maximum anti-sweat heater power per area of door opening for low-temperature passage and freight doors is higher than the average for these equipment classes, and the maximum for these equipment classes is also higher than the maximum for low-temperature display doors.
26 Please
E:FRFM16JYP1.SGM

see footnote 22.

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