[Federal Register Volume 76, Number 111 (Thursday, June 9, 2011)]
[Rules and Regulations]
[Pages 33631-33639]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: C1-2011-8690]


-----------------------------------------------------------------------

DEPARTMENT OF ENERGY

10 CFR Part 431

[Docket No. EERE-2008-BT-TP-0014]
RIN 1904-AB85


Energy Conservation Program: Test Procedures for Walk-In Coolers 
and Walk-In Freezers

Correction

    In rule document 2011-8690 appearing on pages 21579-21612 in the 
issue of Friday, April 15, 2011, the regulatory text is being 
republished below in its entirety due to errors in the equations.

PART 431--[CORRECTED]

    On page 21604, in the third column, in the third paragraph from the 
top, the regulatory text should read as set forth below:

PART 431--ENERGY EFFICIENCY PROGRAM FOR CERTAIN COMMERCIAL AND 
INDUSTRIAL EQUIPMENT

0
1. The authority citation for part 431 continues to read as follows:

    Authority: 42 U.S.C. 6291-6317.


0
2. Section 431.302 is amended by adding, in alphabetical order, new 
definitions for ``Display door,'' ``Display panel,'' ``Door'', 
``Envelope,'' ``K-factor,'' ``Panel,'' ``Refrigerated,'' 
``Refrigeration system,'' and ``U-factor'' to read as follows:


Sec.  431.302  Definitions concerning walk-in coolers and walk-in 
freezers.

* * * * *
    Display door means a door designed for product movement, display, 
or both, rather than the passage of persons.
    Display panel means a panel that is entirely or partially comprised 
of glass, a transparent material, or both and is used for display 
purposes.
    Door means an assembly installed in an opening on an interior or 
exterior wall that is used to allow access or close off the opening and 
that is movable in a sliding, pivoting, hinged, or revolving manner of 
movement. For walk-in coolers and walk-in freezers, a door includes the 
door panel, glass, framing materials, door plug, mullion, and any other 
elements that form the door or part of its connection to the wall.
    Envelope means--
    (1) The portion of a walk-in cooler or walk-in freezer that 
isolates the interior, refrigerated environment from the ambient, 
external environment; and
    (2) All energy-consuming components of the walk-in cooler or walk-
in freezer that are not part of its refrigeration system.
    K-factor means the thermal conductivity of a material.
* * * * *
    Panel means a construction component that is not a door and is used 
to construct the envelope of the walk-in, i.e., elements that separate 
the interior refrigerated environment of the walk-in from the exterior.
    Refrigerated means held at a temperature at or below 55 degrees 
Fahrenheit using a refrigeration system.
    Refrigeration system means the mechanism (including all controls 
and other components integral to the system's operation) used to create 
the refrigerated environment in the interior of a walk-in cooler or 
freezer, consisting of:
    (1) A packaged dedicated system where the unit cooler and 
condensing unit are integrated into a single piece of equipment; or
    (2) A split dedicated system with separate unit cooler and 
condensing unit sections; or
    (3) A unit cooler that is connected to a multiplex condensing 
system.
    U-factor means the heat transmission in a unit time through a unit 
area of a specimen or product and its boundary air films, induced by a 
unit temperature difference between the environments on each side.
* * * * *

0
3. Section 431.303 is amended by:
0
a. Redesignating paragraph (b) as paragraph (c);
0
b. Adding at the end of the sentence in redesignated paragraph (c)(1), 
``and Appendix A to Subpart R of Part 431''.
0
c. Adding new paragraphs (b), (c)(2), (d), and (e) to read as follows.


Sec.  431.303  Materials incorporated by reference.

* * * * *
    (b) AHRI. Air-Conditioning, Heating, and Refrigeration Institute, 
2111 Wilson Boulevard, Suite 500, Arlington, VA 22201, (703) 600-0366, 
or http://www.ahrinet.org.
    (1) AHRI 1250 (I-P)-2009, (``AHRI 1250''), 2009 Standard for 
Performance Rating of Walk-In Coolers and Freezers, approved 2009, IBR 
approved for Sec.  431.304.
    (2) [Reserved]
    (c) * * *
    (2) ASTM C1363-05, (``ASTM C1363''), Standard Test Method for 
Thermal Performance of Building Materials and Envelope Assemblies by 
Means of a Hot Box Apparatus, approved May 1, 2005, IBR approved for 
Appendix A to Subpart R of part 431.
    (d) CEN. European Committee for Standardization (French: Norme or 
German: Norm), Avenue Marnix 17, B-1000 Brussels, Belgium, Tel: + 32 2 
550 08 11, Fax: + 32 2 550 08 19 or http://www.cen.eu/.
    (1) DIN EN 13164:2009-02, (``DIN EN 13164''), Thermal insulation 
products for buildings--Factory made products of extruded polystyrene 
foam (XPS)--Specification, approved February 2009, IBR approved for 
Appendix A to Subpart R of part 431.
    (2) DIN EN 13165:2009-02, (``DIN EN 13165''), Thermal insulation 
products for buildings--Factory made rigid polyurethane foam (PUR) 
products--Specification, approved February 2009, IBR approved for 
Appendix A to Subpart R of part 431.
    (e) NFRC. National Fenestration Rating Council, 6305 Ivy Lane, Ste. 
140, Greenbelt, MD 20770, (301) 589-1776, or http://www.nfrc.org/.
    (1) NFRC 100-2010[E0A1], (``NFRC 100''), Procedure for Determining 
Fenestration Product U-factors, approved June 2010, IBR approved for 
Appendix A to Subpart R of part 431.
    (2) [Reserved]

0
4. Section 431.304 is amended by redesignating paragraphs (b)(2), 
(b)(3), (b)(4), and (b)(5) as (b)(1), (b)(2), (b)(3), and (b)(4), 
respectively, and by adding new paragraphs (b)(5), (b)(6), (b)(7), and 
(b)(8) to read as follows.


Sec.  431.304  Uniform test method for the measurement of energy 
consumption of walk-in coolers and walk-in freezers.

* * * * *
    (b) * * *
    (5) Determine the U-factor, conduction load, and energy use of 
walk-in cooler and walk-in freezer display panels, floor panels, and 
non-floor panels by conducting the test procedure set forth in Appendix 
A to this subpart, sections 4.1, 4.2, and 4.3, respectively.
    (6) Determine the energy use of walk-in cooler and walk-in freezer 
display doors and non-display doors by conducting the test procedure 
set forth in Appendix A to this subpart, sections 4.4 and 4.5, 
respectively.
    (7) Determine the Annual Walk-in Energy Factor of walk-in cooler 
and walk-in freezer refrigeration systems by conducting the test 
procedure set forth in AHRI 1250 (incorporated by reference; see Sec.  
431.303).
    (8) Determine the annual energy consumption of walk-in cooler and 
walk-in freezer refrigeration systems:

[[Page 33632]]

    (i) For systems consisting of a packaged dedicated system or a 
split dedicated system, where the condensing unit is located outdoors, 
by conducting the test procedure set forth in AHRI 1250 and recording 
the annual energy consumption term in the equation for annual walk-in 
energy factor in section 7 of AHRI 1250:
[GRAPHIC] [TIFF OMITTED] TR09JN11.000

where tj and n represent the outdoor temperature at each 
bin j and the number of hours in each bin j, respectively, for the 
temperature bins listed in Table D1 of AHRI 1250.

    (ii) For systems consisting of a packaged dedicated system or a 
split dedicated system where the condensing unit is located in a 
conditioned space, by performing the following calculation:
[GRAPHIC] [TIFF OMITTED] TR09JN11.001

where BLH and BLL for refrigerator and freezer systems are defined 
in sections 6.2.1 and 6.2.2, respectively, of AHRI 1250 and the 
annual walk-in energy factor is calculated from the results of the 
test procedures set forth in AHRI 1250.

    (iii) For systems consisting of a single unit cooler or a set of 
multiple unit coolers serving a single piece of equipment and connected 
to a multiplex condensing system, by performing the following 
calculation:
[GRAPHIC] [TIFF OMITTED] TR09JN11.002

where BLH and BLL for refrigerator and freezer systems are defined 
in section 7.9.2.2 and 7.9.2.3, respectively, of AHRI 1250 and the 
annual walk-in energy factor is calculated from the results of the 
test procedures set forth in AHRI 1250.


0
5. Appendix A to subpart R of part 431 is added to read as follows:

Appendix A to Subpart R of Part 431--Uniform Test Method for the 
Measurement of Energy Consumption of the Components of Envelopes of 
Walk-In Coolers and Walk-In Freezers

1.0 Scope

    This appendix covers the test requirements used to measure the 
energy consumption of the components that make up the envelope of a 
walk-in cooler or walk-in freezer.

2.0 Definitions

    The definitions contained in Sec.  431.302 are applicable to 
this appendix.

3.0 Additional Definitions

    3.1 Automatic door opener/closer means a device or control 
system that ``automatically'' opens and closes doors without direct 
user contact, such as a motion sensor that senses when a forklift is 
approaching the entrance to a door and opens it, and then closes the 
door after the forklift has passed.
    3.2 Core region means the part of the panel that is not the edge 
region.
    3.3 Edge region means a region of the panel that is wide enough 
to encompass any framing members and edge effects. If the panel 
contains framing members (e.g. a wood frame) then the width of the 
edge region must be as wide as any framing member plus 2 in.  0.25 in. If the panel does not contain framing members then 
the width of the edge region must be 4 in  0.25 in. For 
walk-in panels that utilize vacuum insulated panels (VIP) for 
insulation, the width of the edge region must be the lesser of 4.5 
in.  1 in. or the maximum width that does not cause the 
VIP to be pierced by the cutting device when the edge region is cut.
    3.4 Surface area means the area of the surface of the walk-in 
component that would be external to the walk-in. For example, for 
panel, the surface area would be the area of the side of the panel 
that faces the outside of the walk-in. It would not include edges of 
the panel that are not exposed to the outside of the walk-in.
    3.5 Rating conditions means, unless explicitly stated otherwise, 
all conditions shown in Table A.1. For installations where two or 
more walk-in envelope components share any surface(s), the 
``external conditions'' of the shared surface(s) must reflect the 
internal conditions of the adjacent walk-in. For example, if a walk-
in component divides a walk-in freezer from a walk-in cooler, then 
the internal conditions are the freezer rating conditions and the 
external conditions are the cooler rating conditions.
    3.6 Percent time off (PTO) means the percent of time that an 
electrical device is assumed to be off.

                    Table A.1--Temperature Conditions
------------------------------------------------------------------------
 
------------------------------------------------------------------------
        Internal Temperatures (cooled space within the envelope)
------------------------------------------------------------------------
Cooler Dry Bulb Temperature...............  35 [deg]F.
Freezer Dry Bulb Temperature..............  -10 [deg]F.
------------------------------------------------------------------------
         External Temperatures (space external to the envelope)
------------------------------------------------------------------------
Freezer and Cooler Dry Bulb Temperatures..  75 [deg]F.
------------------------------------------------------------------------

[[Page 33633]]

 
                          Subfloor Temperatures
------------------------------------------------------------------------
Freezer and Cooler Dry Bulb Temperatures..  55 [deg]F.
------------------------------------------------------------------------

4.0 Calculation Instructions

    4.1 Display Panels
    (a) Calculate the U-factor of the display panel in accordance 
with section 5.3 of this appendix, Btu/h-ft\2\-[deg]F.
    (b) Calculate the display panel surface area, as defined in 
section 3.4 of this appendix, Adp, ft\2\, with standard 
geometric formulas or engineering software.
    (c) Calculate the temperature differential, 
[Delta]Tdp, [deg]F, for the display panel, as follows:
[GRAPHIC] [TIFF OMITTED] TR09JN11.003

Where:
TDB,ext,dp = dry-bulb air external temperature, [deg]F, 
as prescribed in Table A.1; and
TDB,int,dp = dry-bulb air temperature internal to the 
cooler or freezer, [deg]F, as prescribed in Table A.1.

    (d) Calculate the conduction load through the display panel, 
Qcond-dp, Btu/h, as follows:
[GRAPHIC] [TIFF OMITTED] TR09JN11.004

Where:
Adp = surface area of the walk-in display panel, ft\2\;
[Delta]Tdp= temperature differential between refrigerated 
and adjacent zones, [deg]F; and
Udp = thermal transmittance, U-factor, of the display 
panel in accordance with section 5.3 of this appendix, Btu/h-ft\2\-
[deg]F.

    (e) Select Energy Efficiency Ratio (EER), as follows:
    (1) For coolers, use EER = 12.4 Btu/W-h
    (2) For freezers, use EER = 6.3 Btu/W-h
    (f) Calculate the total daily energy consumption, Edp, 
kWh/day, as follows:
[GRAPHIC] [TIFF OMITTED] TR09JN11.005

Where:
Qcond, dp = the conduction load through the display 
panel, Btu/h; and EER = EER of walk-in (cooler or freezer), Btu/W-h.
4.2 Floor Panels
    (a) Calculate the surface area, as defined in section 3.4 of this 
appendix, of the floor panel edge, as defined in section 3.3, 
Afp edge, ft\2\, with standard geometric formulas or 
engineering software as directed in section 5.1 of this appendix.
    (b) Calculate the surface area, as defined in section 3.4 of this 
appendix, of the floor panel core, as defined in section 3.2, 
Afp core, ft\2\, with standard geometric formulas or 
engineering software as directed in section 5.1 of this appendix.
    (c) Calculate the total area of the floor panel, Afp, 
ft\2\, as follows:
[GRAPHIC] [TIFF OMITTED] TR09JN11.006

Where:
Afp core = floor panel core area, ft\2\; and
Afp edge = floor panel edge area, ft\2\.

    (d) Calculate the temperature differential of the floor panel, 
[Delta][Tgr]fp, [deg]F, as follows:
[GRAPHIC] [TIFF OMITTED] TR09JN11.007

Where:
Text, fp = subfloor temperature, [deg]F, as prescribed in 
Table A.1; and
TDB,int, fp = dry-bulb air internal temperature, [deg]F, 
as prescribed in Table A.1. If the panel spans both cooler and 
freezer temperatures, the freezer temperature must be used.

    (e) Calculate the floor foam degradation factor, DFfp, 
unitless, as follows:
[GRAPHIC] [TIFF OMITTED] TR09JN11.008

Where:
RLTTR,fp = the long term thermal resistance R-value of 
the floor panel foam in accordance with section 5.2 of this 
appendix, h-ft\2\-[deg]F/Btu; and
Ro,fp = the R-value of foam determined in accordance with 
ASTM C518 (incorporated by reference; see section Sec.  431.303) for 
purposes of compliance with the appropriate energy conservation 
standard, h-ft\2\-[deg]F/Btu.

    (f) Calculate the U-factor for panel core region modified by the 
long term thermal transmittance of foam, ULT,fp core, Btu/h-
ft\2\-[deg]F, as follows:
[GRAPHIC] [TIFF OMITTED] TR09JN11.009

Where:
Ufp core = the U-factor in accordance with section 5.1 of 
this appendix, Btu/h-ft\2\-[deg]F; and
DFfp = floor foam degradation factor, unitless.

    (g) Calculate the overall U-factor of the floor panel, 
Ufp, Btu/h-ft\2\-[deg]F, as follows:

[[Page 33634]]

[GRAPHIC] [TIFF OMITTED] TR09JN11.010

Where:
Afp edge = area of floor panel edge, ft\2\;
Ufp edge = U-factor for panel edge area in accordance 
with section 5.1 of this appendix, Btu/h-ft\2\-[deg]F;
Afp core = area of floor panel core, ft\2\;
ULT,fp core = U-factor for panel core region modified by 
the long term thermal transmittance of foam, Btu/h-ft\2\-[deg]F; and
Afp = total area of the floor panel, ft\2\.

    (h) Calculate the conduction load through floor panels, 
Qcond-fp, Btu/h,
[GRAPHIC] [TIFF OMITTED] TR09JN11.011

Where:
[Delta]Tfp = temperature differential across the floor 
panels, [deg]F;
Afp = total area of the floor panel, ft\2\; and
Ufp = overall U-factor of the floor panel, Btu/h-ft\2\-
[deg]F.

    (i) Select Energy Efficiency Ratio (EER), as follows:
    (1) For coolers, use EER = 12.4 Btu/W-h
    (2) For freezers, use EER = 6.3 Btu/W-h
    (j) Calculate the total daily energy consumption, Efp, 
kWh/day, as follows:
[GRAPHIC] [TIFF OMITTED] TR09JN11.012

Where:
Qcond-fp = the conduction load through the floor panel, 
Btu/h; and EER = EER of walk-in (cooler or freezer), Btu/W-h.
4.3 Non-Floor Panels
    (a) Calculate the surface area, as defined in section 3.4, of the 
non-floor panel edge, as defined in section 3.3, Anf edge, 
ft\2\, with standard geometric formulas or engineering software as 
directed in section 5.1 of this appendix.
    (b) Calculate the surface area, as defined in section 3.4, of the 
non-floor panel core, as defined in section 3.2, Anf core, 
ft\2,\ with standard geometric formulas or engineering software as 
directed in section 5.1 of this appendix.
    (c) Calculate total non-floor panel area, Anf, ft\2\:
    [GRAPHIC] [TIFF OMITTED] TR09JN11.013
    
Where:
Anf edge = non-floor panel edge area, ft\2\; and
Anf core = non-floor panel core area, ft\2\.

    (d) Calculate temperature differential, [Delta]Tnf, 
[deg]F:
[GRAPHIC] [TIFF OMITTED] TR09JN11.014

Where:
TDB,ext, nf = dry-bulb air external temperature, [deg]F, 
as prescribed in Table A.1; and
TDB,int, nf = dry-bulb air internal temperature, [deg]F, 
as prescribed in Table A.1. If the non-floor panel spans both cooler 
and freezer temperatures, then the freezer temperature must be used.

    (e) Calculate the non-floor foam degradation factor, 
DFnf, unitless, as follows:
[GRAPHIC] [TIFF OMITTED] TR09JN11.015

Where:

RLTTR,nf = the R-value of the non-floor panel foam in 
accordance with section 5.2 of this appendix, h- ft\2\-[deg]F/Btu; 
and
Ro,nf = the R-value of foam determined in accordance with 
ASTM C518 (incorporated by reference; see section Sec.  431.303) for 
purposes of compliance with the appropriate energy conservation 
standard, h-ft\2\-[deg]F/Btu.

    (f) Calculate the U-factor, ULT,nf core, Btu/h-ft\2\-
[deg]F, as follows:
[GRAPHIC] [TIFF OMITTED] TR09JN11.016

Where:

Unf core = the U-factor, in accordance with section 5.1 
of this appendix, of non-floor panel, Btu/h- ft\2\-[deg]F; and
DFnf = the non-floor foam degradation factor, unitless.

    (g) Calculate the overall U-factor of the non-floor panel, 
Unf, Btu/h-ft\2\-[deg]F, as follows:
[GRAPHIC] [TIFF OMITTED] TR09JN11.017

Where:

Anf edge = area of non-floor panel edge, ft\2\;
Unf edge = U-factor for non-floor panel edge area in 
accordance with section 5.1 of this appendix, Btu/h-ft\2\-[deg]F;
Anf core = area of non-floor panel core, ft\2\;
ULT,nf core = U-factor for non-floor panel core region 
modified by the long term thermal transmittance of foam, Btu/h-
ft\2\-[deg]F; and
Anf = total area of the non- floor panel, ft\2\.

    (h) Calculate the conduction load through non-floor panels, 
Qcond-nf, Btu/h,

[[Page 33635]]

[GRAPHIC] [TIFF OMITTED] TR09JN11.018

Where:

[Delta]Tnf = temperature differential across the non-
floor panels, [deg]F;
Anf = total area of the non-floor panel, ft\2\; and
Unf = overall U-factor of the non-floor panel, Btu/h-
ft\2\-[deg]F.

    (i) Select Energy Efficiency Ratio (EER), as follows:
    (1) For coolers, use EER = 12.4 Btu/W-h
    (2) For freezers, use EER = 6.3 Btu/W-h
    (j) Calculate the total daily energy consumption, Enf, 
kWh/day, as follows:
[GRAPHIC] [TIFF OMITTED] TR09JN11.019

Where:

Qcond-nf = the conduction load through the non-floor 
panel, Btu/h; and
EER = EER of walk-in (cooler or freezer), Btu/W-h.
4.4 Display Doors
4.4.1 Conduction Through Display Doors
    (a) Calculate the U-factor of the door in accordance with section 
5.3 of this appendix, Btu/h-ft\2\-[deg]F
    (b) Calculate the surface area, as defined in section 3.4 of this 
appendix, of the display door, Add, ft\2\, with standard 
geometric formulas or engineering software.
    (c) Calculate the temperature differential, [Delta]Tdd, 
[deg]F, for the display door as follows:
[GRAPHIC] [TIFF OMITTED] TR09JN11.020

Where:

TDB,ext, dd = dry-bulb air temperature external to the 
display door, [deg]F, as prescribed in Table A.1; and
TDB,int, dd = dry-bulb air temperature internal to the 
display door, [deg]F, as prescribed in Table A.1.

    (d) Calculate the conduction load through the display doors, 
Qcond-dd, Btu/h, as follows:
[GRAPHIC] [TIFF OMITTED] TR09JN11.021

Where:

[Delta]Tdd = temperature differential between 
refrigerated and adjacent zones, [deg]F;
Add = surface area walk-in display doors, ft\2\; and
Udd = thermal transmittance, U-factor of the door, in 
accordance with section 5.3 of this appendix, Btu/h-ft\2\-[deg]F.
4.4.2 Direct Energy Consumption of Electrical Component(s) of Display 
Doors
    Electrical components associated with display doors could include, 
but are not limited to: heater wire (for anti-sweat or anti-freeze 
application); lights (including display door lighting systems); control 
system units; and sensors.
    (a) Select the required value for percent time off (PTO) for each 
type of electricity consuming device, PTOt (%)
    (1) For lights without timers, control system or other demand-based 
control, PTO = 25 percent. For lighting with timers, control system or 
other demand-based control, PTO = 50 percent.
    (2) For anti-sweat heaters on coolers (if included): Without 
timers, control system or other demand-based control, PTO = 0 percent. 
With timers, control system or other demand-based control, PTO = 75 
percent. For anti-sweat heaters on freezers (if included): Without 
timers, control system or other auto-shut-off systems, PTO = 0 percent. 
With timers, control system or other demand-based control, PTO = 50 
percent.
    (3) For all other electricity consuming devices: Without timers, 
control system, or other auto-shut-off systems, PTO = 0 percent. If it 
can be demonstrated that the device is controlled by a preinstalled 
timer, control system or other auto-shut-off system, PTO = 25 percent.
    (b) Calculate the power usage for each type of electricity 
consuming device, Pdd-comp,u,t, kWh/day, as follows:
[GRAPHIC] [TIFF OMITTED] TR09JN11.022

Where:

u = the index for each of type of electricity-consuming device 
located on either (1) the interior facing side of the display door 
or within the inside portion of the display door, (2) the exterior 
facing side of the display door, or (3) any combination of (1) and 
(2). For purposes of this calculation, the interior index is 
represented by u = int and the exterior index is represented by u = 
ext. If the electrical component is both on the interior and 
exterior side of the display door then u = int. For anti-sweat 
heaters sited anywhere in the display door, 75 percent of the total 
power is be attributed to u = int and 25 percent of the total power 
is attributed to u = ext;
t = index for each type of electricity consuming device with 
identical rated power;
Prated,u,t = rated power of each component, of type t, 
kW;
PTOu,t = percent time off, for device of type t, %; and
nu,t = number of devices at the rated power of type t, 
unitless.

    (c) Calculate the total electrical energy consumption for interior 
and exterior power, Pdd-tot, int (kWh/day) and 
Pdd-tot, ext (kWh/day), respectively, as follows:

[[Page 33636]]

[GRAPHIC] [TIFF OMITTED] TR09JN11.023

Where:

t = index for each type of electricity consuming device with 
identical rated power;
Pdd-comp,int, t = the energy usage for an electricity 
consuming device sited on the interior facing side of or in the 
display door, of type t, kWh/day; and
Pdd-comp,ext, t = the energy usage for an electricity 
consuming device sited on the external facing side of the display 
door, of type t, kWh/day.

    (d) Calculate the total electrical energy consumption, 
Pdd-tot, (kWh/day), as follows:
[GRAPHIC] [TIFF OMITTED] TR09JN11.024

Where:

Pdd-tot,int = the total interior electrical energy usage 
for the display door, kWh/day; and

Pdd-tot,ext = the total exterior electrical energy usage 
for the display door, kWh/day.
4.4.3 Total Indirect Electricity Consumption Due to Electrical Devices
    (a) Select Energy Efficiency Ratio (EER), as follows:
    (1) For coolers, use EER = 12.4 Btu/Wh
    (2) For freezers, use EER = 6.3 Btu/Wh
    (b) Calculate the additional refrigeration energy consumption due 
to thermal output from electrical components sited inside the display 
door, Cdd-load, kWh/day, as follows:
[GRAPHIC] [TIFF OMITTED] TR09JN11.025

Where:

EER = EER of walk-in cooler or walk-in freezer, Btu/W-h; and
Pdd-tot,int = The total internal electrical energy 
consumption due for the display door, kWh/day.
4.4.4 Total Display Door Energy Consumption
    (a) Select Energy Efficiency Ratio (EER), as follows:
    (1) For coolers, use EER = 12.4 Btu/W-h
    (2) For freezers, use EER = 6.3 Btu/W-h
    (b) Calculate the total daily energy consumption due to conduction 
thermal load, Edd, thermal, kWh/day, as follows:
[GRAPHIC] [TIFF OMITTED] TR09JN11.026

Where:

Qcond, dd = the conduction load through the display door, 
Btu/h; and
EER = EER of walk-in (cooler or freezer), Btu/W-h.

    (c) Calculate the total energy, Edd,tot, kWh/day,
    [GRAPHIC] [TIFF OMITTED] TR09JN11.027
    
Where:

Edd, thermal = the total daily energy consumption due to 
thermal load for the display door, kWh/day;
Pdd-tot = the total electrical load, kWh/day; and
Cdd-load = additional refrigeration load due to thermal 
output from electrical components contained within the display door, 
kWh/day.
4.5 Non-Display Doors
4.5.1 Conduction Through Non-Display Doors
    (a) Calculate the surface area, as defined in section 3.4 of this 
appendix, of the non-display door, And, ft\2\, with standard 
geometric formulas or with engineering software.
    (b) Calculate the temperature differential of the non-display door, 
[Delta]Tnd,[deg]F, as follows:
[GRAPHIC] [TIFF OMITTED] TR09JN11.028


Where:

TDB,ext, nd = dry-bulb air external temperature, [deg]F, 
as prescribed by Table A.1; and
TDB,int, nd = dry-bulb air internal temperature, [deg]F, 
as prescribed by Table A.1. If the component spans both cooler and 
freezer spaces, the freezer temperature must be used.

    (c) Calculate the conduction load through the non-display door: 
Qcond-nd, Btu/h,

[[Page 33637]]

[GRAPHIC] [TIFF OMITTED] TR09JN11.029


Where:

[Delta]Tnd = temperature differential across the non-
display door, [deg]F;
Und = thermal transmittance, U-factor of the door, in 
accordance with section 5.3 of this appendix, Btu/h-ft\2\-[deg]F; 
and
And = area of non-display door, ft\2\.
4.5.2 Direct Energy Consumption of Electrical Components of Non-Display 
Doors
    Electrical components associated with a walk-in non-display door 
comprise any components that are on the non-display door and that 
directly consume electrical energy. This includes, but is not limited 
to, heater wire (for anti-sweat or anti-freeze application), control 
system units, and sensors.
    (a) Select the required value for percent time off for each type of 
electricity consuming device, PTOt (%)
    (1) For lighting without timers, control system or other demand-
based control, PTO = 25 percent. For lighting with timers, control 
system or other demand-based control, PTO = 50 percent.
    (2) For anti-sweat heaters on coolers (if included): Without 
timers, control system or other demand-based control, PTO = 0 percent. 
With timers, control system or other demand-based control, PTO = 75 
percent. For anti-sweat heaters on freezers (if included): Without 
timers, control system or other auto-shut-off systems, PTO = 0 percent. 
With timers, control system or other demand-based control, PTO = 50 
percent.
    (3) For all other electricity consuming devices: Without timers, 
control system, or other auto-shut-off systems, PTO = 0 percent. If it 
can be demonstrated that the device is controlled by a preinstalled 
timer, control system or other auto-shut-off system, PTO = 25 percent.
    (b) Calculate the power usage for each type of electricity 
consuming device, Pnd-comp,u,t, kWh/day, as follows:
[GRAPHIC] [TIFF OMITTED] TR09JN11.030


Where:

u = the index for each of type of electricity-consuming device 
located on either (1) the interior facing side of the display door 
or within the inside portion of the display door, (2) the exterior 
facing side of the display door, or (3) any combination of (1) and 
(2). For purposes of this calculation, the interior index is 
represented by u = int and the exterior index is represented by u = 
ext. If the electrical component is both on the interior and 
exterior side of the display door then u = int. For anti-sweat 
heaters sited anywhere in the display door, 75 percent of the total 
power is be attributed to u=int and 25 percent of the total power is 
attributed to u=ext;
t = index for each type of electricity consuming device with 
identical rated power;
Prated,u,t = rated power of each component, of type t, 
kW;
PTOu,t = percent time off, for device of type t, %; and
nu,t = number of devices at the rated power of type t, 
unitless.

    (c) Calculate the total electrical energy consumption for interior 
and exterior power, Pnd-tot, int (kWh/day) and 
Pnd-tot, ext (kWh/day), respectively, as follows:
[GRAPHIC] [TIFF OMITTED] TR09JN11.031


Where:

t = index for each type of electricity consuming device with 
identical rated power;
Pnd-comp,int, t = the energy usage for an electricity 
consuming device sited on the internal facing side or internal to 
the non-display door, of type t, kWh/day; and
Pnd-comp,ext, t = the energy usage for an electricity 
consuming device sited on the external facing side of the non-
display door, of type t, kWh/day. For anti-sweat heaters,

    (d) Calculate the total electrical energy consumption, 
Pnd-tot, kWh/day, as follows:
[GRAPHIC] [TIFF OMITTED] TR09JN11.032

Where:

Pnd-tot,int = the total interior electrical energy usage 
for the non-display door, of type t, kWh/day; and
Pnd-tot,ext = the total exterior electrical energy usage 
for the non-display door, of type t, kWh/day.
4.5.3 Total Indirect Electricity Consumption Due to Electrical Devices
    (a) Select Energy Efficiency Ratio (EER), as follows:
    (1) For coolers, use EER = 12.4 Btu/Wh
    (2) For freezers, use EER = 6.3 Btu/Wh
    (b) Calculate the additional refrigeration energy consumption due 
to thermal output from electrical components associated with the non-
display door, Cnd-load, kWh/day, as follows:
[GRAPHIC] [TIFF OMITTED] TR09JN11.033


Where:

EER = EER of walk-in cooler or freezer, Btu/W-h; and
Pnd-tot,int = the total interior electrical energy 
consumption for the non-display door, kWh/day.
4.5.4 Total Non-Display Door Energy Consumption
    (a) Select Energy Efficiency Ratio (EER), as follows:
    (1) For coolers, use EER = 12.4 Btu/W-h
    (2) For freezers, use EER = 6.3 Btu/W-h
    (b) Calculate the total daily energy consumption due to thermal 
load, End, thermal, kWh/day, as follows:

[[Page 33638]]

[GRAPHIC] [TIFF OMITTED] TR09JN11.034


Where:

Qcond-nd = the conduction load through the non-display 
door, Btu/hr; and
EER = EER of walk-in (cooler or freezer), Btu/W-h.

    (c) Calculate the total energy, End,tot, kWh/day, as 
follows:
[GRAPHIC] [TIFF OMITTED] TR09JN11.035


Where:
End, thermal = the total daily energy consumption due to 
thermal load for the non-display door, kWh/day;
Pnd-tot = the total electrical energy consumption, kWh/
day; and
Cnd-load = additional refrigeration load due to thermal 
output from electrical components contained on the inside face of 
the non-display door, kWh/day.
5.0 Test Methods and Measurements
5.1 Measuring Floor and Non-floor Panel U-factors
    Follow the test procedure in ASTM C1363, (incorporated by 
reference; see Sec.  431.303), exactly, with these exceptions:
(1) Test Sample Geometry Requirements
    (i) Two (2) panels, 8 ft.  1 ft. long and 4 ft.  1 ft. wide must be used.
    (ii) The panel edges must be joined using the manufacturer's panel 
interface joining system (e.g., camlocks, standard gasketing, etc.).
    (iii) The Panel Edge Test Region, see figure 1, must be cut using 
the following dimensions:
    1. If the panel contains framing members (e.g. a wood frame), then 
the width of edge (W) must be as wide as any framing member plus 2 in. 
 0.25 in. For example, if the face of the panel contains 
1.5 in. thick framing members around the edge of the panel, then width 
of edge (W) = 3.5 in.  0.25 in and the Panel Edge Test 
Region would be 7 in.  0.5 in. wide.
    2. If the panel does not contain framing members, then the width of 
edge (W) must be 4 in  0. 25 in.
    3. Walk-in panels that utilize vacuum insulated panels (VIP) for 
insulation, width of edge (W) = the lesser of 4.5 in.  1 
in. or the maximum width that does not cause the VIP to be pierced by 
the cutting device when the edge region is cut.
    (iv) Panel Core Test Region of length Y and height Z, see Figure 1, 
must also be cut from one of the two panels such that panel length = Y 
+ X, panel height = Z +X where X=2W.
[GRAPHIC] [TIFF OMITTED] TR09JN11.036

(2) Testing Conditions
    (i) The air temperature on the ``hot side'', as denoted in ASTM 
C1363, of the non-floor panel should be maintained at 75 [deg]F  1 [deg]F.
    1. Exception: When testing floor panels, the air temperature should 
be maintained at 55 [deg]F  1 [deg]F.

[[Page 33639]]

    (ii) The temperature on the ``cold side'', as denoted in ASTM 
C1363, of the panel should be maintained at 35 [deg]F  1 
[deg]F for the panels used for walk-in coolers and -10 [deg]F  1 [deg]F for panels used for walk-in freezers.
    (iii) The air velocity must be maintained as natural convection 
conditions as described in ASTM C1363. The test must be completed using 
the masked method and with surround panel in place as described in ASTM 
C1363.
(3) Required Test Measurements
    (i) Non-floor Panels
    1. Panel Edge Region U-factor: Unf, edge
    2. Panel Core Region U-factor: Unf, core
    (ii) Floor Panels
    1. Floor Panel Edge Region U-factor: Ufp, edge
    2. Floor Panel Core Region U-factor: Ufp, core
5.2 Measuring Long Term Thermal Resistance (LTTR) of Insulating Foam
    Follow the test procedure in Annex C of DIN EN 13164 or Annex C of 
DIN EN 13165 (as applicable), (incorporated by reference; see Sec.  
431.303), exactly, with these exceptions:
(1) Temperatures During Thermal Resistance Measurement
    (i) For freezers: 20 [deg]F  1 [deg]F must be used.
    (ii) For coolers: 55 [deg]F  1 [deg]F must be used.
(2) Sample Panel Preparation
    (i) A 800mm x 800mm square (x thickness of the panel) section cut 
from the geometric center of the panel that is being tested must be 
used as the sample for completing DIN EN 13165.
    (ii) A 500mm x 500mm square (x thickness of the panel) section cut 
from the geometric center of the panel that is being tested must be 
used as the sample for completing DIN EN 13164.
(3) Required Test Measurements
    (i) Non-floor Panels
    1. Long Term Thermal Resistance: RLTTR,nf
    (ii) Floor Panels
    1. Long Term Thermal Resistance: RLTTR,fp
5.3 U-factor of Doors and Display Panels
    (a) Follow the procedure in NFRC 100, (incorporated by reference; 
see Sec.  431.303), exactly, with these exceptions:
    (1) The average convective heat transfer coefficient on both 
interior and exterior surfaces of the door should be based on the 
coefficients described in section 4.3 of NFRC 100.
    (2) Internal conditions:
    (i) Air temperature of 35 [deg]F (1.7 [deg]C) for cooler doors and 
-10 [deg]F (-23.3 [deg]C) for freezer doors
    (ii) Mean inside radiant temperature must be the same as shown in 
section 5.3(a)(2)(i), above.
    (3) External conditions
    (i) Air temperature of 75 [deg]F (23.9 [deg]C)
    (ii) Mean outside radiant temperature must be the same as section 
5.3(a)(3)(i), above.
    (4) Direct solar irradiance = 0 W/m\2\ (Btu/h-ft\2\).
    (b) Required Test Measurements
    (i) Display Doors and Display Panels
    1. Thermal Transmittance: Udd
    (ii) Non-Display Door
    1. Thermal Transmittance: Und

[FR Doc. C1-2011-8690 Filed 6-8-11; 8:45 am]
BILLING CODE 1505-01-D