Energy Conservation Program; Correction:
Federal Register Volume 76, Number 111 (Thursday, June 9, 2011)
Rules and Regulations
Pages 33631-33639
From the Federal Register Online via the Government Printing 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 tjand 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
Tgrfp, [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:
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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:
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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:
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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:
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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:
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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.
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(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.
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(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
