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Rule
Energy Conservation Program: Test Procedures for WalkIn Coolers and WalkIn Freezers
A Rule by the Energy Department on
This document is a correction of an document that was published on 04/15/2011. View Uncorrected Document
Document Details
Information about this document as published in the Federal Register.
 Printed version:
 Publication Date:
 06/09/2011
 Agency:
 Department of Energy
 Document Type:
 Rule
 Document Citation:
 76 FR 33631
 Page:
 3363133639 (9 pages)
 CFR:
 10 CFR 431
 Agency/Docket Number:
 Docket No. EERE2008BTTP0014
 RIN:
 1904AB85
 Document Number:
 C120118690
Document Details

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 Correction
 PART 431—[CORRECTED]
 PART 431—ENERGY EFFICIENCY PROGRAM FOR CERTAIN COMMERCIAL AND INDUSTRIAL EQUIPMENT
 Appendix A to Subpart R of Part 431—Uniform Test Method for the Measurement of Energy Consumption of the Components of Envelopes of WalkIn Coolers and WalkIn Freezers
 1.0 Scope
 2.0 Definitions
 3.0 Additional Definitions
 4.0 Calculation Instructions
 4.2 Floor Panels
 4.3 NonFloor Panels
 4.4 Display Doors
 4.4.1 Conduction Through Display Doors
 4.4.2 Direct Energy Consumption of Electrical Component(s) of Display Doors
 4.4.3 Total Indirect Electricity Consumption Due to Electrical Devices
 4.4.4 Total Display Door Energy Consumption
 4.5 NonDisplay Doors
 4.5.1 Conduction Through NonDisplay Doors
 4.5.2 Direct Energy Consumption of Electrical Components of NonDisplay Doors
 4.5.3 Total Indirect Electricity Consumption Due to Electrical Devices
 4.5.4 Total NonDisplay Door Energy Consumption
 5.0 Test Methods and Measurements
 5.1 Measuring Floor and Nonfloor Panel Ufactors
 (1) Test Sample Geometry Requirements
 (2) Testing Conditions
 (3) Required Test Measurements
 5.2 Measuring Long Term Thermal Resistance (LTTR) of Insulating Foam
 (1) Temperatures During Thermal Resistance Measurement
 (2) Sample Panel Preparation
 (3) Required Test Measurements
 5.3 Ufactor of Doors and Display Panels
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Correction
In rule document 20118690 appearing on pages 2157921612 in the issue of Friday, April 15, 2011, the regulatory text is being republished below in its entirety due to errors in the equations.
Start PartPART 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:
End Part Start PartPART 431—ENERGY EFFICIENCY PROGRAM FOR CERTAIN COMMERCIAL AND INDUSTRIAL EQUIPMENT
End Part Start Amendment Part1. The authority citation for part 431 continues to read as follows:
End Amendment Part Start AuthorityAuthority: 42 U.S.C. 62916317.
End Authority Start Amendment Part2. Section 431.302 is amended by adding, in alphabetical order, new definitions for “Display door,” “Display panel,” “Door”, “Envelope,” “Kfactor,” “Panel,” “Refrigerated,” “Refrigeration system,” and “Ufactor” to read as follows:
End Amendment PartDisplay 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 walkin coolers and walkin 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 walkin cooler or walkin freezer that isolates the interior, refrigerated environment from the ambient, external environment; and
(2) All energyconsuming components of the walkin cooler or walkin freezer that are not part of its refrigeration system.
Kfactor 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 walkin, i.e., elements that separate the interior refrigerated environment of the walkin 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 walkin 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.
Ufactor 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.
3. Section 431.303 is amended by:
End Amendment Part Start Amendment Parta. Redesignating paragraph (b) as paragraph (c);
End Amendment Part Start Amendment Partb. Adding at the end of the sentence in redesignated paragraph (c)(1), “and Appendix A to Subpart R of Part 431”.
End Amendment Part Start Amendment Partc. Adding new paragraphs (b), (c)(2), (d), and (e) to read as follows.
End Amendment Part(b) AHRI. AirConditioning, Heating, and Refrigeration Institute, 2111 Wilson Boulevard, Suite 500, Arlington, VA 22201, (703) 6000366, or http://www.ahrinet.org.
(1) AHRI 1250 (IP)2009, (“AHRI 1250”), 2009 Standard for Performance Rating of WalkIn Coolers and Freezers, approved 2009, IBR approved for § 431.304.
(2) [Reserved]
(c) * * *
(2) ASTM C136305, (“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, B1000 Brussels, Belgium, Tel: + 32 2 550 08 11, Fax: + 32 2 550 08 19 or http://www.cen.eu/.
(1) DIN EN 13164:200902, (“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 13165:200902, (“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) 5891776, or http://www.nfrc.org/.
(1) NFRC 1002010[E0A1], (“NFRC 100”), Procedure for Determining Fenestration Product Ufactors, approved June 2010, IBR approved for Appendix A to Subpart R of part 431.
(2) [Reserved]
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.
End Amendment Part(b) * * *
(5) Determine the Ufactor, conduction load, and energy use of walkin cooler and walkin freezer display panels, floor panels, and nonfloor 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 walkin cooler and walkin freezer display doors and nondisplay 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 Walkin Energy Factor of walkin cooler and walkin freezer refrigeration systems by conducting the test procedure set forth in AHRI 1250 (incorporated by reference; see § 431.303).
(8) Determine the annual energy consumption of walkin cooler and walkin freezer refrigeration systems:Start Printed 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 walkin energy factor in section 7 of AHRI 1250:
where t_{j} 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:
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 walkin 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:
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 walkin energy factor is calculated from the results of the test procedures set forth in AHRI 1250.
5. Appendix A to subpart R of part 431 is added to read as follows:
End Amendment PartAppendix A to Subpart R of Part 431—Uniform Test Method for the Measurement of Energy Consumption of the Components of Envelopes of WalkIn Coolers and WalkIn 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 walkin cooler or walkin freezer.
2.0 Definitions
The definitions contained in § 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 walkin 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 walkin component that would be external to the walkin. For example, for panel, the surface area would be the area of the side of the panel that faces the outside of the walkin. It would not include edges of the panel that are not exposed to the outside of the walkin.
3.5 Rating conditions means, unless explicitly stated otherwise, all conditions shown in Table A.1. For installations where two or more walkin envelope components share any surface(s), the “external conditions” of the shared surface(s) must reflect the internal conditions of the adjacent walkin. For example, if a walkin component divides a walkin freezer from a walkin 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.
Internal Temperatures (cooled space within the envelope)  
Cooler Dry Bulb Temperature  35 °F. 
Freezer Dry Bulb Temperature  −10 °F. 
External Temperatures (space external to the envelope)  
Freezer and Cooler Dry Bulb Temperatures  75 °F. 
Start Printed Page 33633  
Subfloor Temperatures  
Freezer and Cooler Dry Bulb Temperatures  55 °F. 
4.0 Calculation Instructions
4.1 Display Panels
(a) Calculate the Ufactor of the display panel in accordance with section 5.3 of this appendix, Btu/hft^{2}°F.
(b) Calculate the display panel surface area, as defined in section 3.4 of this appendix, A_{dp}, ft^{2}, with standard geometric formulas or engineering software.
(c) Calculate the temperature differential, ΔT_{dp}, °F, for the display panel, as follows:
Where:
T_{DB,ext,dp} = drybulb air external temperature, °F, as prescribed in Table A.1; and
T_{DB,int,dp} = drybulb air temperature internal to the cooler or freezer, °F, as prescribed in Table A.1.
(d) Calculate the conduction load through the display panel, Q_{conddp}, Btu/h, as follows:
Where:
A_{dp} = surface area of the walkin display panel, ft^{2};
ΔT_{dp}= temperature differential between refrigerated and adjacent zones, °F; and
U_{dp} = thermal transmittance, Ufactor, of the display panel in accordance with section 5.3 of this appendix, Btu/hft^{2}°F.
(e) 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
(f) Calculate the total daily energy consumption, E_{dp}, kWh/day, as follows:
Where:
Q_{cond, dp} = the conduction load through the display panel, Btu/h; and EER = EER of walkin (cooler or freezer), Btu/Wh.
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, A_{fp 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, A_{fp 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, A_{fp,} ft^{2}, as follows:
Where:
A_{fp core} = floor panel core area, ft^{2}; and
A_{fp edge} = floor panel edge area, ft^{2}.
(d) Calculate the temperature differential of the floor panel, ΔΤ_{fp}, °F, as follows:
Where:
T_{ext, fp} = subfloor temperature, °F, as prescribed in Table A.1; and
T_{DB,int, fp} = drybulb air internal temperature, °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, DF_{fp}, unitless, as follows:
Where:
R_{LTTR,fp} = the long term thermal resistance Rvalue of the floor panel foam in accordance with section 5.2 of this appendix, hft^{2}°F/Btu; and
R_{o,fp} = the Rvalue of foam determined in accordance with ASTM C518 (incorporated by reference; see section § 431.303) for purposes of compliance with the appropriate energy conservation standard, hft^{2}°F/Btu.
(f) Calculate the Ufactor for panel core region modified by the long term thermal transmittance of foam, U_{LT,fp core}, Btu/hft^{2}°F, as follows:
Where:
U_{fp core} = the Ufactor in accordance with section 5.1 of this appendix, Btu/hft^{2}°F; and
DF_{fp} = floor foam degradation factor, unitless.
(g) Calculate the overall Ufactor of the floor panel, U_{fp}, Btu/hft^{2}°F, as follows:
Start Printed Page 33634Where:
A_{fp edge} = area of floor panel edge, ft^{2};
U_{fp edge} = Ufactor for panel edge area in accordance with section 5.1 of this appendix, Btu/hft^{2}°F;
A_{fp core} = area of floor panel core, ft^{2};
U_{LT,fp core} = Ufactor for panel core region modified by the long term thermal transmittance of foam, Btu/hft^{2}°F; and
A_{fp} = total area of the floor panel, ft^{2}.
(h) Calculate the conduction load through floor panels, Q_{condfp}, Btu/h,
Where:
ΔT_{fp} = temperature differential across the floor panels, °F;
A_{fp} = total area of the floor panel, ft^{2}; and
U_{fp} = overall Ufactor of the floor panel, Btu/hft^{2}°F.
(i) 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
(j) Calculate the total daily energy consumption, E_{fp}, kWh/day, as follows:
Where:
Q_{condfp} = the conduction load through the floor panel, Btu/h; and EER = EER of walkin (cooler or freezer), Btu/Wh.
4.3 NonFloor Panels
(a) Calculate the surface area, as defined in section 3.4, of the nonfloor panel edge, as defined in section 3.3, A_{nf 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 nonfloor panel core, as defined in section 3.2, A_{nf core,} ft^{2,} with standard geometric formulas or engineering software as directed in section 5.1 of this appendix.
(c) Calculate total nonfloor panel area, A_{nf}, ft^{2}:
Where:
A_{nf edge} = nonfloor panel edge area, ft^{2}; and
A_{nf core} = nonfloor panel core area, ft^{2}.
(d) Calculate temperature differential, ΔT_{nf}, °F:
Where:
T_{DB,ext, nf} = drybulb air external temperature, °F, as prescribed in Table A.1; and
T_{DB,int, nf} = drybulb air internal temperature, °F, as prescribed in Table A.1. If the nonfloor panel spans both cooler and freezer temperatures, then the freezer temperature must be used.
(e) Calculate the nonfloor foam degradation factor, DF_{nf}, unitless, as follows:
Where:
R_{LTTR,nf} = the Rvalue of the nonfloor panel foam in accordance with section 5.2 of this appendix, h ft^{2}°F/Btu; and
R_{o,nf} = the Rvalue of foam determined in accordance with ASTM C518 (incorporated by reference; see section § 431.303) for purposes of compliance with the appropriate energy conservation standard, hft^{2}°F/Btu.
(f) Calculate the Ufactor, U_{LT,nf core}, Btu/hft^{2}°F, as follows:
Where:
U_{nf core} = the Ufactor, in accordance with section 5.1 of this appendix, of nonfloor panel, Btu/h ft^{2}°F; and
DF_{nf} = the nonfloor foam degradation factor, unitless.
(g) Calculate the overall Ufactor of the nonfloor panel, U_{nf}, Btu/hft^{2}°F, as follows:
Where:
A_{nf edge} = area of nonfloor panel edge, ft^{2};
U_{nf edge} = Ufactor for nonfloor panel edge area in accordance with section 5.1 of this appendix, Btu/hft^{2}°F;
A_{nf core} = area of nonfloor panel core, ft^{2};
U_{LT,nf core} = Ufactor for nonfloor panel core region modified by the long term thermal transmittance of foam, Btu/hft^{2}°F; and
A_{nf} = total area of the non floor panel, ft^{2}.
(h) Calculate the conduction load through nonfloor panels, Q_{condnf}, Btu/h,
Start Printed Page 33635Where:
ΔT_{nf} = temperature differential across the nonfloor panels, °F;
A_{nf} = total area of the nonfloor panel, ft^{2}; and
U_{nf} = overall Ufactor of the nonfloor panel, Btu/hft^{2}°F.
(i) 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
(j) Calculate the total daily energy consumption, E_{nf}, kWh/day, as follows:
Where:
Q_{condnf} = the conduction load through the nonfloor panel, Btu/h; and
EER = EER of walkin (cooler or freezer), Btu/Wh.
4.4 Display Doors
4.4.1 Conduction Through Display Doors
(a) Calculate the Ufactor of the door in accordance with section 5.3 of this appendix, Btu/hft^{2}°F
(b) Calculate the surface area, as defined in section 3.4 of this appendix, of the display door, A_{dd}, ft^{2}, with standard geometric formulas or engineering software.
(c) Calculate the temperature differential, ΔT_{dd}, °F, for the display door as follows:
Where:
T_{DB,ext, dd} = drybulb air temperature external to the display door, °F, as prescribed in Table A.1; and
T_{DB,int, dd} = drybulb air temperature internal to the display door, °F, as prescribed in Table A.1.
(d) Calculate the conduction load through the display doors, Q_{conddd}, Btu/h, as follows:
Where:
ΔT_{dd} = temperature differential between refrigerated and adjacent zones, °F;
A_{dd} = surface area walkin display doors, ft^{2}; and
U_{dd} = thermal transmittance, Ufactor of the door, in accordance with section 5.3 of this appendix, Btu/hft^{2}°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 antisweat or antifreeze 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, PTO_{t} (%)
(1) For lights without timers, control system or other demandbased control, PTO = 25 percent. For lighting with timers, control system or other demandbased control, PTO = 50 percent.
(2) For antisweat heaters on coolers (if included): Without timers, control system or other demandbased control, PTO = 0 percent. With timers, control system or other demandbased control, PTO = 75 percent. For antisweat heaters on freezers (if included): Without timers, control system or other autoshutoff systems, PTO = 0 percent. With timers, control system or other demandbased control, PTO = 50 percent.
(3) For all other electricity consuming devices: Without timers, control system, or other autoshutoff systems, PTO = 0 percent. If it can be demonstrated that the device is controlled by a preinstalled timer, control system or other autoshutoff system, PTO = 25 percent.
(b) Calculate the power usage for each type of electricity consuming device, P_{ddcomp,u,t}, kWh/day, as follows:
Where:
u = the index for each of type of electricityconsuming 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 antisweat 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;
P_{rated,u,t} = rated power of each component, of type t, kW;
PTO_{u,t} = percent time off, for device of type t, %; and
n_{u,t} = number of devices at the rated power of type t, unitless.
(c) Calculate the total electrical energy consumption for interior and exterior power, P_{ddtot, int} (kWh/day) and P_{ddtot, ext} (kWh/day), respectively, as follows:
Start Printed Page 33636Where:
t = index for each type of electricity consuming device with identical rated power;
P_{ddcomp,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
P_{ddcomp,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, P_{ddtot}, (kWh/day), as follows:
Where:
P_{ddtot,int} = the total interior electrical energy usage for the display door, kWh/day; and
P_{ddtot,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, C_{ddload}, kWh/day, as follows:
Where:
EER = EER of walkin cooler or walkin freezer, Btu/Wh; and
P_{ddtot,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/Wh
(2) For freezers, use EER = 6.3 Btu/Wh
(b) Calculate the total daily energy consumption due to conduction thermal load, E_{dd, thermal}, kWh/day, as follows:
Where:
Q_{cond, dd} = the conduction load through the display door, Btu/h; and
EER = EER of walkin (cooler or freezer), Btu/Wh.
(c) Calculate the total energy, E_{dd,tot}, kWh/day,
Where:
E_{dd, thermal} = the total daily energy consumption due to thermal load for the display door, kWh/day;
P_{ddtot} = the total electrical load, kWh/day; and
C_{ddload} = additional refrigeration load due to thermal output from electrical components contained within the display door, kWh/day.
4.5 NonDisplay Doors
4.5.1 Conduction Through NonDisplay Doors
(a) Calculate the surface area, as defined in section 3.4 of this appendix, of the nondisplay door, A_{nd}, ft^{2}, with standard geometric formulas or with engineering software.
(b) Calculate the temperature differential of the nondisplay door, ΔT_{nd},°F, as follows:
Where:
T_{DB,ext, nd} = drybulb air external temperature, °F, as prescribed by Table A.1; and
T_{DB,int, nd} = drybulb air internal temperature, °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 nondisplay door: Q_{condnd}, Btu/h,
Start Printed Page 33637Where:
ΔT_{nd} = temperature differential across the nondisplay door, °F;
U_{nd} = thermal transmittance, Ufactor of the door, in accordance with section 5.3 of this appendix, Btu/hft^{2}°F; and
A_{nd} = area of nondisplay door, ft^{2}.
4.5.2 Direct Energy Consumption of Electrical Components of NonDisplay Doors
Electrical components associated with a walkin nondisplay door comprise any components that are on the nondisplay door and that directly consume electrical energy. This includes, but is not limited to, heater wire (for antisweat or antifreeze application), control system units, and sensors.
(a) Select the required value for percent time off for each type of electricity consuming device, PTO_{t} (%)
(1) For lighting without timers, control system or other demandbased control, PTO = 25 percent. For lighting with timers, control system or other demandbased control, PTO = 50 percent.
(2) For antisweat heaters on coolers (if included): Without timers, control system or other demandbased control, PTO = 0 percent. With timers, control system or other demandbased control, PTO = 75 percent. For antisweat heaters on freezers (if included): Without timers, control system or other autoshutoff systems, PTO = 0 percent. With timers, control system or other demandbased control, PTO = 50 percent.
(3) For all other electricity consuming devices: Without timers, control system, or other autoshutoff systems, PTO = 0 percent. If it can be demonstrated that the device is controlled by a preinstalled timer, control system or other autoshutoff system, PTO = 25 percent.
(b) Calculate the power usage for each type of electricity consuming device, P_{ndcomp,u,t}, kWh/day, as follows:
Where:
u = the index for each of type of electricityconsuming 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 antisweat 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;
P_{rated,u,t} = rated power of each component, of type t, kW;
PTO_{u,t} = percent time off, for device of type t, %; and
n_{u,t} = number of devices at the rated power of type t, unitless.
(c) Calculate the total electrical energy consumption for interior and exterior power, P_{ndtot, int} (kWh/day) and P_{ndtot, ext} (kWh/day), respectively, as follows:
Where:
t = index for each type of electricity consuming device with identical rated power;
P_{ndcomp,int, t} = the energy usage for an electricity consuming device sited on the internal facing side or internal to the nondisplay door, of type t, kWh/day; and
P_{ndcomp,ext, t} = the energy usage for an electricity consuming device sited on the external facing side of the nondisplay door, of type t, kWh/day. For antisweat heaters,
(d) Calculate the total electrical energy consumption, P_{ndtot}, kWh/day, as follows:
Where:
P_{ndtot,int} = the total interior electrical energy usage for the nondisplay door, of type t, kWh/day; and
P_{ndtot,ext} = the total exterior electrical energy usage for the nondisplay 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 nondisplay door, C_{ndload}, kWh/day, as follows:
Where:
EER = EER of walkin cooler or freezer, Btu/Wh; and
P_{ndtot,int} = the total interior electrical energy consumption for the nondisplay door, kWh/day.
4.5.4 Total NonDisplay Door Energy Consumption
(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 total daily energy consumption due to thermal load, E_{nd, thermal}, kWh/day, as follows:
Start Printed Page 33638Where:
Q_{condnd} = the conduction load through the nondisplay door, Btu/hr; and
EER = EER of walkin (cooler or freezer), Btu/Wh.
(c) Calculate the total energy, E_{nd,tot}, kWh/day, as follows:
Where:
E_{nd, thermal} = the total daily energy consumption due to thermal load for the nondisplay door, kWh/day;
P_{ndtot} = the total electrical energy consumption, kWh/day; and
C_{ndload} = additional refrigeration load due to thermal output from electrical components contained on the inside face of the nondisplay door, kWh/day.
5.0 Test Methods and Measurements
5.1 Measuring Floor and Nonfloor Panel Ufactors
Follow the test procedure in ASTM C1363, (incorporated by reference; see § 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. Walkin 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.
(2) Testing Conditions
(i) The air temperature on the “hot side”, as denoted in ASTM C1363, of the nonfloor panel should be maintained at 75 °F ± 1 °F.
1. Exception: When testing floor panels, the air temperature should be maintained at 55 °F ± 1 °F.Start Printed Page 33639
(ii) The temperature on the “cold side”, as denoted in ASTM C1363, of the panel should be maintained at 35 °F ± 1 °F for the panels used for walkin coolers and −10 °F ± 1 °F for panels used for walkin 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) Nonfloor Panels
1. Panel Edge Region Ufactor: U_{nf, edge}
2. Panel Core Region Ufactor: U_{nf, core}
(ii) Floor Panels
1. Floor Panel Edge Region Ufactor: U_{fp, edge}
2. Floor Panel Core Region Ufactor: U_{fp, 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 § 431.303), exactly, with these exceptions:
(1) Temperatures During Thermal Resistance Measurement
(i) For freezers: 20 °F ± 1 °F must be used.
(ii) For coolers: 55 °F ± 1 °F must be used.
(2) Sample Panel Preparation
(i) A 800mm × 800mm square (× 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 × 500mm square (× 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) Nonfloor Panels
1. Long Term Thermal Resistance: R_{LTTR,nf}
(ii) Floor Panels
1. Long Term Thermal Resistance: R_{LTTR,fp}
5.3 Ufactor of Doors and Display Panels
(a) Follow the procedure in NFRC 100, (incorporated by reference; see § 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 °F (1.7 °C) for cooler doors and −10 °F (−23.3 °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 °F (23.9 °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/hft^{2}).
(b) Required Test Measurements
(i) Display Doors and Display Panels
1. Thermal Transmittance: U_{dd}
(ii) NonDisplay Door
1. Thermal Transmittance: U_{nd}
End Preamble[FR Doc. C120118690 Filed 6811; 8:45 am]
BILLING CODE 150501D