Federal Register, Volume 75, Number 226, November 24, 2010, Pages 71519-72652 Page: 71,604
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Federal Register/Vol. 75, No. 226/Wednesday, November 24, 2010/Proposed Rules
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Eq. 2
Where: In equation 2, the time the case
toff= time period which the lights are off due lighting is dimmed or off due to
to the use of lighting occupancy sensors scheduled lighting controls (toffcontrols or
or scheduled controls (hours); tdjm
tdim = time period which the lights are dim tdis.oto, as applicable) will be 8 hours
due to the use of lighting occupancy for those cases with lighting controls
sensors or scheduled controls (hours); installed. This will depend on whether
toff controls = time case lighting is off due to the the controls dim or turn off lights. A
use of lighting controls (hours); time off period of 8 hours was chosen
tdim,controls = time case lighting is dimmed due for scheduled controls to approximate
to the use of lighting controls (hours); the typical usage of lighting control
toff sensors = time case lighting is off due to the products based on comments received
use of lighting occupancy sensors products based on comments received
(hours); and during previous DOE rulemakings for
tdimsensors = time case lighting is dimmed due this equipment. Specifically, during the
to the use of lighting occupancy sensors previous rulemaking for commercial
(hours). refrigeration equipment, California
As the test procedure is for 24-hour Utilities commented that 8 hours
time period, the sum of tsc, Toff and tdim reflected the California predicted "low
should equal 24 hours. DOE also load" period. (Docket number EERE-
proposes that the total time period 2006-BT-STD-0126, California Joint
during which the lights are off or Comment, No. 41, at p. 12)
dimmed shall not exceed 10.8 hours The time the case lighting is off or
based on the maximum estimated dimmed due to lighting occupancy
energy savings from lighting occupancy sensors (toff sensors or tdim,sensors, as
sensors and controls. This limit is applicable) will be 2.8 or 10.8 hours for
established to prevent double counting cases with lighting occupancy sensors
of energy savings in equipment where installed, depending on whether
both lighting occupancy sensors and scheduled controls are also installed.
schedule based controls are installed. For equipment with only lighting
t o L- 0f - tIca Eq. 3 occupancy sensors installed to sensors or
Where: tdimsensors, as applicable, will be 10.8
Where:hours. For equipment with both lighting
toff = time period which the lights are off due occupancy sensors and lighting controls
to the use of lighting occupancy sensors installed, the lighting controls will be
or scheduled controls (hours);
tdim = time period which the lights are assumed to override the occupancy
dimmed due to the use of lighting sensor during the time the lighting
occupancy sensors or scheduled controls control is used to reduce case lighting.
(hours); Thus, the time the case lighting is off or
tsc= time period when lighting is fully on dimmed due to lighting occupancy
with lighting occupancy sensors and sensors (toff sensors or tdimsensors, as
controls enabled (hours); applicable) will be 2.8 hours for
t = time period when lighting would be on equipment with lighting occupancy
without lighting occupancy sensors or
controls (24 hours); sensors and lighting controls installed.
with the sum of all toff and tdim from both The time off period for lighting
lighting occupancy sensors and controls not occupancy sensors was derived based
to exceed 10.8 hours. on the previously cited demonstrationproject conducted through the DOE
GATEWAY program.
Equations 1, 2, and 3 can be used to
calculate the energy use of CRE whether
the equipment utilizes lighting
occupancy sensors or control, and
whether the light settings are set at fully
on, fully off, or dimmed. For example,
consider a situation in which lighting
that is dimmed throughout the day by
occupancy sensors and is turned off
completely by scheduled controls
during closing hours. In this example,
tdim for the dimmed occupancy sensor
would be 2.8 hours, and toff for the
scheduled lighting control, which turns
off the lights, would be 8 hours. The
sum of toff and tdim would be equal to the
maximum 10.8 hours. In this example,
both tdim,controls and toff sensors would equal
zero.
In addition to conserving energy
directly through decreased lighting
electrical load, occupancy sensors also
decrease the heat load from lights that
are located inside the refrigerated space
on the refrigeration equipment.
Therefore, a second calculation is
necessary to account for these energy
impacts. This second calculation
quantifies the reduced compressor
energy use, which is then used to
calculate total energy use, as described
below.
For remote condensing equipment,
the calculation of Alternate Component
Indirect Effect in section 5.4 of AHRI
Standard 1200-2010 can be used to
measure the energy impacts on the
compressor. Thus, for remote
condensing equipment, equation 4, from
AHRI Standard 1200 equations 5.4 and
5.4.2, can be applied to calculate the
decreased compressor power due to use
of lighting occupancy sensors and
controls.1 t QEq. 4
EERWhere:
CECA= Alternate Compressor Energy
Consumption (kilowatt-hours);
LECsc = lighting energy consumption of
internal case lights with lighting
occupancy sensors and controls
deployed (kilowatt-hours);
P,, = rated power of lights when they are fully
on (watts);t = time lighting would be on without
lighting occupancy sensors or controls
(24 hours); and
EER = energy efficiency ratio from Table 1 in
AHRI Standard 1200-2010 for remote
condensing equipment and the values
shown in Table III.1 of this document for
self-contained equipment (British
thermal units/watt).TABLE 111.1. EER FOR SELF-CON-
TAINED COMMERCIAL REFRIGERATED
DISPLAY MERCHANDISERS AND
STORAGE CABINETSOperating temperature
class
M edium .................. ........
Low .................. ...........EER
Btu/W
11.26
7.1471604
C0 m, 0, 7 -S ~
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United States. Office of the Federal Register. Federal Register, Volume 75, Number 226, November 24, 2010, Pages 71519-72652, periodical, November 24, 2010; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc52807/m1/94/: accessed March 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.