STANDARD SAVINGS ESTIMATION PROTOCOL FOR
GROCERY REFRIGERATION SYSTEM MEASURES
Submitted to
REGIONAL TECHNICAL FORUM
Submitted by
Portland Energy Conservation Inc.
100 SW Main St, Ste 1600
Portland, OR 97204
July 8, 2011
Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
TABLE OF CONTENTS
1. PURPOSE............................................................................................................ 1
2. SUNSET CRITERIA ................................................................................................. 1
3. DEFINITION
OF KEY TERMS ..................................................................................... 1
4. REQUIRED KNOWLEDGE AND SKILLS OF PRACTITIONER ................................................... 2
5. ELIGIBLE PROJECTS ............................................................................................... 2
6. REQUIRED COMMISSIONING.................................................................................... 3
7. DATA COLLECTION REQUIREMENTS ........................................................................... 3
7.1. Site-Specific Data ............................................................................................................... 3
7.2. Non-Site Specific Data........................................................................................................ 3
7.3. Typical Meterological Year (TMY) Weather Data .............................................................. 3
8. PROVISIONAL DATA REQUIREMENTS ......................................................................... 4
8.1. Provisional Data Collection ................................................................................................ 4
9. SAVINGS ESTIMATION STEPS ................................................................................... 6
10. SAMPLING PROCEDURE ........................................................................................ 7
11. TYPICAL COST OF APPLYING THIS PROTOCOL ............................................................. 7
APPENDIX: KEY CRITERIA AUDIT INPUTS ........................................................................ 8
APPENDIX: MEASURE-SPECIFIC KEYWORD MODIFICATION SCHEME .................................... 22
Portland Energy Conservation Inc
Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
1. PURPOSE
This protocol establishes a method to calculate annual energy savings for multiple refrigeration system
components and controls that have been retrofitted or adjusted to perform in a more energy efficient
way.
This protocol specifies minimum acceptable data collection requirements and the method by which
these data are to be used in computing savings. Savings are computed using the DOE2.2 refrigeration
version (DOE2.2r) energy simulation model. DOE2.2r inputs come from site-specific observations and
default values where site specific values are not practical or necessary. Standardized methods for data
collection and rules for the application of average default parameter values allow this protocol to be
applied consistently throughout the region.
2. SUNSET CRITERIA
This protocol is approved for use until sufficient data (refer to Section 8) has been collected to allow the
protocol to be modified and adopted by the RTF without provisional data requirements.
3. DEFINITION OF KEY TERMS
Project. A bundle of eligible energy efficient measures (see section 5) implemented on a store
refrigeration system or equipment .
Baseline. The conditions that describe a refrigeration system as it exists at the time of an audit, or by
current practice whichever is appropriate for the measures that comprise the projectBest Practice
Savings Estimate. Savings estimates generated through end use meter data of refrigeration systems
Candidate Savings Estimate. Savings estimates generated from applying the approach outlined in this
standard protocol
Post. The conditions that describe a refrigeration system at a point in time after measure
implementation
System Measure: A measure that directly affects the energy performance of the refrigeration system
Load Measure: A measure that reduces refrigeration load
Keyword: A DOE2.2r variable to which a site-specific or default parameter input is assigned
Store: Store types that typically have grocery refrigeration systems and may include grocery,
convenience, or big box stores.
Portland Energy Conservation Inc.
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Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
4. REQUIRED KNOWLEDGE AND SKILLS OF PRACTITIONER
The practitioner who has lead responsibility for applying this protocol to a store must have a full
understanding of the following:

Appropriate safety procedures for work involving refrigeration system audits (in various store types
such as groceries, convenience stores, big box retail with groceries, etc.) and the measurement
equipment required by this protocol.

Understanding of this protocol.

Knowledge of required inputs and expected outputs of DOE2.2r.
The practitioner must also be able to successfully perform the following tasks:

Identify, by inspection, the refrigeration system configuration, controls operation, and energy
efficiency opportunities.

Correctly interpret and record site specific data required for the calculator.

Understand the primary drivers of refrigeration system energy use: (1) outside air temperature and
humidity, (2) grocery refrigeration equipment, (3) refrigeration system configuration, (4) control
strategies, (5) store air temperature and humidity, (6) walk-in utilization and air temperature, and
(7) facility operations schedule.
5. ELIGIBLE PROJECTS
Eligible projects are bundles of improvements that contain one or more of the following measures listed
in the table below. The use of this protocol is restricted to eligible projects.
Measure
Decrease open display case infiltration by adding doors or night covers.
Load
Replace display case with new high efficiency display case.
Load
Decrease Anti-sweat Heat by replacing display case doors or adding a controller.
Load
Decrease walk-in fan motor electric use by installing a more efficient motor and/or
motor speed controller.
Load
Retrofit display case evaporator fan motor with high efficiency motor.
Load
Minimize compressor suction and discharge pressure.
System
Retrofit or replace condenser with high efficiency condenser, evaporative-cooled or
evaporative pre-cooled condenser.
System
Replace case and/or walk-in lighting with more efficient lighting.
2
Measure Type
Load
Portland Energy Conservation Inc.
Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
Measure
Measure Type
Retrofit compressor head fan motor and/or condenser fan motor with higher
efficiency motor and/or motor with variable speed.
Direct
Replace compressor with higher efficiency compressor.
System
Replace compressor with compressor with unloading capability and/or compressor
with variable speed.
System
Add or improve infiltration barrier to walk-ins
Load
Add display case and/or walk-in lighting motion sensor.
Load
Replace door gaskets on display case and walk-in doors.
Load
6. REQUIRED COMMISSIONING
Post-installation on-site inspection is required for measures that involve significant capital investment to
confirm that the measures are installed and are operating according to specifications. Project cost is a
general and easy way to identify larger projects with high savings and the definition of “significant
capital investment” varies by utility program (e.g. greater than $10,000). For all other measures, invoices
for materials and work performed, as well as equipment specification documents from the equipment
manufacturer are reviewed to confirm installation of the measures.
7. DATA COLLECTION REQUIREMENTS
This section outlines the data needed to estimate savings via the savings calculator.
7.1. Site-Specific Data
See Appendix: Key Criteria Audit Inputs for a description of the site specific audit data. The Key Criteria
Audit Inputs highlights influential variables in modeling and the sources of data. The column “From
Audit” denotes data that are collected during an audit.
7.2. Non-Site Specific Data
Non-critical required inputs of the model will be assigned default parameter values derived from
analysis of historical audit data. Please see Appendix: Key Criteria Audit Inputs for details.
7.3. Typical Meterological Year (TMY) Weather Data
The TMY3 hourly weather data file that closest approximates weather at a site will be used in
estimating annual saving..
Portland Energy Conservation Inc.
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Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
8. PROVISIONAL DATA REQUIREMENTS
The standard protocol will remain classified as Provisional until adequate empirical data is collected to
ensure the calculator estimates savings reliably and accurately. This section outlines the provisional data
requirements.
8.1. Provisional Data Collection
Data will be measured for a minimum of three weeks pre-project implementation. Post-project
implementation metering must include a minimum of one summer month (July, August or September)
and two shoulder months (October, November, or March through June). The summer and shoulder
months are required to adequately capture equipment response to a range of temperatures during the
metering period. The table below provides a description of the provisional data measurements and
how the data will be used for the candidate simplified method and the best practice method.
Measurement
Compressor
power (kW) and
energy
Use
Candidate
Simplified Method
Requirement
Measurement of
electrical energy use
of each compressor.
Determining
compressor capacity
using compressor
performance data
(kW/ton)
Diagnostic
Condenser fan
electric power
(and pump
motor for
evaporativecooled
condensers)
(kW) and
energy
Measurement of
electrical energy use
of condenser fans
and pumps.
Diagnostic
Display case
electric power
(kW) and
energy
Measurement of fan,
light, defrost, and
ASH electrical energy
use
Diagnostic
4
Best Practice
Method
Requirement
Regression
input
Description
 Electric power (kW)
measured over time
 Maximum 5-minute
interval data
 Data collection must use
watt meter as compressor
efficiency and power
factor varies with load on
motor.
Regression
input
 Same interval as
Regression
input
 Maximum 15-minute
compressor data.
 Volts and power factor (3phs) measured once
 Amps measured over time
 If there is a VFD or 2speed fan, watt meter
data is needed as motor
efficiency and power
factor varies with load
interval data
 Volts and power factor (3phs) measured one time
 Amps measured over time
to estimate kWh.
Portland Energy Conservation Inc.
Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
Measurement
Walk-in electric
power (kW) and
energy
Use
Measurement of fan,
lights, and defrost
Candidate
Simplified Method
Requirement
Diagnostic
Best Practice
Method
Requirement
Regression
input
Description
 Maximum 15-minute
interval data
 Volts and power factor (3phs) measured one time
 Amps measured over time
to estimate kWh.
Regression
input
 Drybulb or wetbulb,
Regression
Input for
applicable
measures
 Maximum 15-minute
To test that
compressor
performance
data is correct
and same load
Regression
Input for
applicable
measures
 Pressure sensor with +/-
Determining
compressor capacity
using compressor
performance data
(need kW/ton)
To test that
compressor
performance
data is correct
and same load
Regression
Input for
applicable
measures
 Pressure sensor with +/-
Evaporative cooled
condensers
performance
Diagnostic for
applicable
measures (Evap
Regression
Input for
applicable
 Accuracy of +/- 2% RH
Outside air
temperature
Variable in regression
model, diagnostics on
condenser energy use
Diagnostic
HVAC end-use
(kWh) and
Therms
Energy savings for
measures with
interactive effects
Diagnostic
Suction Pressure
(psig)
Determining
compressor capacity
using compressor
performance data
(need kW/ton)
Discharge
pressure
(psig)
Outside relative
humidity
Portland Energy Conservation Inc.
depending on condenser
type
 Shaded to prevent solar
 Maximum 30-minute log
data, maximum sampling
time 1-minute
 Accuracy +/- 1 F
interval data (for electric
and gas use)
 Electric energy (kWh)
Data collection must use
watt meter as compressor
efficiency and power
factor varies with load on
motor.
 Gas energy (cu ft and
energy content from
utility) Can use whole
building gas meter if other
uses of gas are identified
as being constant (e.g.
water heating).
2% of FS
 Maximum sampling time
5 seconds maximum 5minute log data
1% of FS
 Maximum sampling time
5 seconds maximum 5minute log data
between 10% and 90%
 Maximum sampling time
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Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
Measurement
Use
Candidate
Simplified Method
Requirement
Best Practice
Method
Requirement
regression
cond)
measures
(Evap cond)
1-minute
 Maximum log time 30
minutes
Indoor
temperature
(store and next to
walk-ins)
Infiltration of the cases
acting with the indoor
air. Also indicates what
HVAC setpoints are
and when it is
operating
Yes, for
measures that
change
infiltration
Yes, for
measures
that change
infiltration
 Maximum 15-minute log
Indoor humidity
(store and next to
walk-ins)
Infiltration of the cases
acting with the indoor
air
Yes, for
measures that
change
infiltration
Yes, for
measures
that change
infiltration
 Accuracy of +/- 2% RH
Yes
Yes
TMY3 NOAA data
for weather site
used in DOE2.2r
Local real-time data for
the measurement
period:
Description
data, maximum sampling
time 1-minute
 Drybulb Temperature
Accuracy +/- 1 F
between 10% and 90%
 Maximum log time 15
minutes, maximum
sampling time 1 minute
Temperature
Correlation between site
temperatures and weather
station data
Temperature, Relative
Humidity, For
refrigeration
Local solar cloud cover
for HVAC loads.
Door open time
(display case and
walk-in)
Calculator diagnostics
Display case and
walk-in air
temperature
Calculator diagnostics
For a sample of display
cases and walk-ins
A trend log per line-up.
One time line-up
checked for
consistency in temp
Not required but
provides insight
if available
Not required
but provides
insight if
available
 Provides diagnostics on
Not required but
provides insight
if available
Not required
but provides
insight if
available
 Provides diagnostics on
walk-in load and display
case load
walk-in load and display
case load
9. SAVINGS ESTIMATION STEPS
Savings are estimated using DOE2.2r, site-specific inputs, and default parameter inputs. The steps for
calculating savings are outlined as follows:
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Portland Energy Conservation Inc.
Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator

Enter all site-specific audit information into DOE2.2r with default parameter values as necessary.

Identify potential energy efficiency measures permitted by program.

Perform DOE2.2r simulation of baseline conditions to calculate baseline energy use.

For each measure, modify baseline DOE2.2r model to simulate implementation of energy efficiency
measure and calculate energy use after project implementation (Refer to Appendix: Measurespecific keyword modification scheme). Add measures incrementally to ensure the savings from the
package of measures includes interactions between measures.

Subtract DOE2.2r annual post implementation energy use from annual baseline energy use to
determine energy savings potential for project.
10. SAMPLING PROCEDURE
No sampling of data points within a project is permitted by this protocol. Data collection and
subsequent savings calculations are required for all implemented energy efficiency measures that
comprise a project.
11. TYPICAL COST OF APPLYING THIS PROTOCOL
An estimate of typical cost of applying this protocol for a single site is shown below. Expense of
alternative measurements, such as reference to a refrigeration schedule for equipment identification or
controls operation, will not be significant.
Item
Hours
$ / Hour
Rental
Total Cost
Travel
3
$110
$330
Facility Operator Interview
.5
$110
$55
Grocery Inspection
3.5
$110
$385
Savings Estimate
.5
$110
$55
Owner Consultation
1
$110
$110
Total
8.5
Labor
Practitioner
Portland Energy Conservation Inc.
$935
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Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
APPENDIX: KEY CRITERIA AUDIT INPUTS
The purpose of the Key Criteria Audit Inputs table is to identify which calculator inputs are from site specific audit data and which are typically
default values that are non-site specific (See Section 7). An overview of the information contained in the table is provided below:
Key Criteria: Specific category of model inputs.

Levels 1, 2, and 3: Sub-levels (data points) of specific Key Criteria.

From Audit: “Y” signifies the data point for information can be collected during the site audit. “N” signifies that the data point always
uses the assumed value specified in the Defaults column.

Source: The source of the data point or information that is collected.

Defaults: The assumed value of the data point if the information is not from the site audit process, or if the data point is not obtainable
during the site audit for some reason (e.g. nameplate information illegible).

Default Source: The source of the defaulted (assumed) value or information.

Default Source Decision Criteria: Criteria used to determine reasonable defaults.

Potential Default Sources: Potential sources of default values.
Key Criteria
Level 1
Level 2
Level 3
From Audit

Source
Defaults
Default Source
Default
Source
Decision
Criteria
Potential Default
Sources
Y
EMS, RS or
Climate zone
data
Design drybulb
+10 deg for low
temp and +15
for medium
temp
Default derived
from design
database with
temp from ZIP
code
ASHRAE
design data
EMS settings, RS
or ASHRAE
System
Design
saturated
condensing
temp
8
Portland Energy Conservation Inc.
Key Criteria
From Audit
Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
Source
Minimum
condensing
temperature
Y
EMS
SCT-Throttle
N
EMS or
refrigeration
schedule
2-10, depending
on SCT control
method.
Market data
N/A
Actual EMS
settings
Refrigerant
Y
On-site
documentatio
n
None
None
N/A
DOE 2.2r choices
Facility
Schedules
Y
On-site
interview with
staff
None
None
N/A
N/A
Case lights
Y
On-site
interview with
staff
18 hour, 24
hour
GrocerSmart
database
GrocerSmart
database
18 hour, 24 hour
Sales floor lights
Y
Hours of
operations
Location
N/A
N/A
HVAC thermostat
Y
24 hour
Market data
N/A
Same
Level 1
Level 2
Level 3
Defaults
90
Default Source
Default
Source
Decision
Criteria
Potential Default
Sources
GrocerSmart
database
GrocerSmart
database
Actual EMS
settings
Schedule
Portland Energy Conservation Inc.
On-site
interview with
staff
On-site
interview with
staff
9
Key Criteria
From Audit
Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
Source
Defaults
Default Source
Default
Source
Decision
Criteria
Y
square
footage and
hours of
operations,
leveraged
from previous
work NREL,
ASHRAE
Tied to hours of
operation and
adapted from
ASHRAE,
NREL
ASHRAE,
NREL
N/A
ASHRAE, NREL
Weather
Y
TMY3 from
ZIP code
lookup table
None
None
N/A
N/A
Floating head
(TD or
Minimum set
point strategy)
Y
EMS
None
GrocerSmart
database
GrocerSmart
database
N/A
Level 1
Level 2
Level 3
Hours of
operation
(informs
occupancy load)
Potential Default
Sources
Weather
Control strategies
10
TD set point
EMS
deadban
d/sensiti
vity
Y
EMS
Low Temp = 10,
Medium Temp =
15
Market data
Market data
EMS settings
Fan cycling
temperat
ure,
pressure
Y
N/A
In DOE 2.2r
model
N/A
N/A
N/A
Portland Energy Conservation Inc.
Key Criteria
Level 1
Level 2
Level 3
VFD control
EMS
deadban
d/sensiti
vity
holdback valve
#/temp
Floating
suction
Portland Energy Conservation Inc.
From Audit
Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
Source
Defaults
Default Source
Default
Source
Decision
Criteria
Y
EMS
No VFD control
GrocerSmart
database
GrocerSmart
database
Present, not
present
N
EMS
2 deg below 1st
fan stage, or
SCT setpoint if
fixed.
Market data
Market data
N/A
Y
EMS
None
N/A
Potential Default
Sources
N/A
Target
temperature
EMS
deadban
d/
sensitivit
y
Y
EMS
DOE 2.2r
default from
case library
values
DOE 2.2r
default from
case library
values
N/A
DOE 2.2r default
from case library
values
Maximum (float
up)
EMS
deadban
d/sensiti
vity
Y
EMS
5#
Market data
Market data
EMS settings
Minimum (float
down)
EMS
deadban
d/sensiti
vity
Y
EMS
0#
Market data
Market data
EMS settings
11
Key Criteria
Level 1
From Audit
Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
Source
Defaults
Default Source
Default
Source
Decision
Criteria
Y
EMS
As max and min
above
Sensitivity
Analysis
Sensitivity
Analysis
EMS settings
Y
EMS or RS
TBD
Sensitivity
Analysis
Sensitivity
Analysis
EMS settings or
DOE 2.2r
Hot gas
Y
EMS or RS
TBD
Sensitivity
Analysis
Sensitivity
Analysis
EMS settings or
DOE 2.2r
Electric
Y
EMS or RS
TBD
Sensitivity
Analysis
Sensitivity
Analysis
EMS settings or
DOE 2.2r
Time off
Y
EMS or RS
TBD
Sensitivity
Analysis
Sensitivity
Analysis
EMS settings or
DOE 2.2r
Initiation
Y
EMS or RS
TBD
Sensitivity
Analysis
Sensitivity
Analysis
EMS settings or
DOE 2.2r
Terminat
ion
Y
EMS or RS
TBD
Sensitivity
Analysis
Sensitivity
Analysis
EMS settings or
DOE 2.2r
Duration
Y
EMS or RS
TBD
Sensitivity
Analysis
Sensitivity
Analysis
EMS settings or
DOE 2.2r
Level 2
Level 3
Primary/
Seconda
ry Float
circuit
temperat
ure
sensors
Defrost Type
12
Portland Energy Conservation Inc.
Potential Default
Sources
Key Criteria
Level 1
From Audit
Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
Source
Defaults
Default Source
Default
Source
Decision
Criteria
Y
System
observation
None
Compressor
library
N/A
Manufacturer/mar
ket data
Unloading
capability
Y
System
documentatio
n
None
Sensitivity
Analysis
Sensitivity
Analysis
EMS settings or
DOE 2.2r
VFD
Y
System
observation
None
None
N/A
EMS settings or
modeling best
practice
Y
derived from
ASHRAE and
ZIP code
lookup table
None
N/A
N/A
derived from
ASHRAE and ZIP
code lookup table
Level 2
Level 3
Potential Default
Sources
Compressor
Type
Design conditions
Cooling
design temp
Portland Energy Conservation Inc.
13
Key Criteria
From Audit
Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
Source
Heating
design temp
Y
derived from
ASHRAE and
ZIP code
lookup table
Altitude
Y
derived from
ASHRAE and
ZIP code
lookup table
None
N/A
N/A
derived from
ASHRAE and ZIP
code lookup table
Air cooled or
evap
Y
On-site
observation
None
N/A
N/A
Condenser library
Rated capacity
Y
Condenser
Nameplate or
RS
1.4 x evaporator
load.
Market data
Market data
Condenser library
Single or multiple
circuit
Y
On-site
observation
None
N/A
N/A
Single, multiple
Y
EMS or RS
None
N/A
N/A
Split, not split
Level 1
Level 2
Level 3
Defaults
Default Source
Default
Source
Decision
Criteria
None
N/A
N/A
derived from
ASHRAE and ZIP
code lookup table
Potential Default
Sources
Condenser
Type
Configuration
Split
Condens
er
14
Portland Energy Conservation Inc.
Key Criteria
From Audit
Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
Source
Defaults
Default Source
Default
Source
Decision
Criteria
Y
On-site
observation
Shaded pole
Market data
Market data
Shaded pole,
PSC, ECM
Number of fans
Y
On-site
observation
Market data
Market data
Condenser library
Wattage
Y
On-site
observation
between 0.5
and 1.5 hp, tied
to database
Condenser
library
Market data
Condenser library
Y
On-site
observation
None
Market data
Market data
Market data
Y
On-site
observation
None
N/A
N/A
N/A
Door
type
Y
On-site
observation
None
N/A
N/A
Market data
Number
of doors
Y
On-site
observation
None
N/A
N/A
N/A
Model
number
Y
On-site
observation
None
N/A
N/A
Market data
Case lighting
(lamp type)
Y
On-site
observation
T8
Market data
Market data
Market data
Lamp quantity
Y
On-site
observation
None
N/A
Ballast type
Y
On-site
observation
Electronic
Market data
Market data
Market data
Level 1
Level 2
Level 3
Fan motor
type
HP of fans
4
Potential Default
Sources
Cases
Type
Length
Portland Energy Conservation Inc.
15
Key Criteria
From Audit
Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
Source
Defaults
Default Source
Default
Source
Decision
Criteria
Y
On-site
observation
1 per
lamp(shelf) or
set of lamps
Market data
Market data
Market data
Case
temperature
Y
EMS or RS
Tied to
database
Case library
Market data
Market data
Coil capacity
Y
Model
number
Tied to
database
Case library
Market data
Market data
Anti-Sweat
Heater/Contro
ls
Y
On-site
observation
None
None
None
Market data
Fan motor
type
Y
On-site
observation/S
ervice
contractor/RS
Shaded pole
Market
data/GrocerSm
art database
Market
data/GrocerSm
art database
Market data
Level 1
Level 2
Ballast quantity
16
Level 3
Portland Energy Conservation Inc.
Potential Default
Sources
Key Criteria
From Audit
Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
Source
Defaults
Default Source
Default
Source
Decision
Criteria
N
On-site
observation
or
refrigeration
schedule
Defaults in
model based on
utility approved
work
paper/engineeri
ng assumptions
Market data
Market data
Market data
EPR
information
Y
On-site
observation
or
refrigeration
schedule
TBD/#X
pressure drop
from circuit, LT
and MT
Market data
Market data
Market data
Case
Infiltration
schedule
(including
door open
times)
N
Refrigeration
schedule/EM
&V
By case type
Market
data/EM&V
Market
data/EM&V
Market
data/EM&V
Temperature
setpoint
Y
EMS/RS
Based on
product
Case library,
Market data
Case library,
Market data
Case library,
Market data
Temperature
throttle
N
EMS
3 deg F
Case library,
Market data
Case library,
Market data
Case library,
Market data
Level 1
Level 2
Fan HP
Portland Energy Conservation Inc.
Level 3
17
Potential Default
Sources
Key Criteria
From Audit
Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
Source
SST-Supply
TD
Y
EMS/RS
10 deg F
Case library,
Market data
Case library,
Market data
Case library,
Market data
Dimensions
(height,
depth, width)
Y
On-site
observation
None
N/A
N/A
N/A
Temperature
Y
EMS
Based on
product
Market data
Market data
Market data
Fan motor
type
Y
On-site
observation
Shaded pole
GrocerSmart
database
Grocer Smart
database
Market data
Number of fans
Y
On-site
observation
None
N/A
N/A
N/A
Evap capacity
N
RS/Market
data
Based on load
calculation for
walk-in
Market data
Market data
Market data
Evap approach
temp (TD)
N
RS/Market
data
default to 10
degrees F
Market data
Market data
Market data
Level 1
Level 2
Level 3
Defaults
Default Source
Default
Source
Decision
Criteria
Potential Default
Sources
Walk ins
18
Portland Energy Conservation Inc.
Key Criteria
From Audit
Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
Source
Door type (for
reach in
doors, all
criteria as
cases, above)
Y
On-site
observation
None
N/A
N/A
Market data
Group
temperature
Y
EMS or RS
Based on
product
Market data
Market data
Market data
Critical loads
Y
EMS or RS
Coldest circuit
N/A
N/A
N/A
Y
EMS or RS
Based on
product and
case type
Case library
Number of
cases and
walk ins per
suction group
Y
EMS or RS
None
N/A
N/A
N/A
Refrigeration
circuits in
suction group
(loads)
Y
EMS or RS
Based on
product and
case type
Case
library/market
data
Case
library/market
data
Case
library/market
data
Y
On-site
observation
None
None
None
Present, not
present, EMS
settings
Level 1
Level 2
Level 3
Defaults
Default Source
Default
Source
Decision
Criteria
Potential Default
Sources
Suction groups
Critical load
setpoints
Subcooler
(mechanical or heat
exchanger)
Portland Energy Conservation Inc.
19
TBD
Key Criteria
From Audit
Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
Source
For Domestic
Hot Water
Y
On-site
observation
None
None
N/A
Present, not
present
For Space
heat
Y
On-site
observation,
RS, EMS
None
None
N/A
Present, not
present, EMS
settings
Y
On-site
observation
Not present
GrocerSmart
database
Grocer Smart
database
Present, not
present
Y
On-site
observation
None
N/A
Level 1
Level 2
Level 3
Defaults
Default Source
Default
Source
Decision
Criteria
Potential Default
Sources
Energy reclaim
(desuperheaters)
Infiltration blockers
(strip curtains,
nightcovers)
Lighting
Sales floor
area
20
Portland Energy Conservation Inc.
N/A
Key Criteria
From Audit
Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
Source
Fixtures on
sales floor
Y
On-site
observation
None
N/A
Lamp type
Y
On-site
observation
None
N/A
NRR-DR standard
table of wattages
Lamp quantity
Y
On-site
observation
None
N/A
NRR-DR standard
table of wattages
Equipment
schedule
N
ASHRAE,
NREL
TBD
NREL
TBD
Occupancy or
schedule
N
ASHRAE,
NREL
TBD
NREL
TBD
Store
N
ASHRAE
TBD (air
changes per
hour)
ASHRAE
TBD
Level 1
Level 2
Level 3
Defaults
Default Source
Default
Source
Decision
Criteria
N/A
Potential Default
Sources
NRR-DR standard
table of wattages
Exterior lighting
Plug load
Area/Person
Infiltration method
Portland Energy Conservation Inc.
21
Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
APPENDIX: MEASURE-SPECIFIC KEYWORD MODIFICATION SCHEME
The Measure-Specific Keyword Modification Scheme provides an overview of the DOE2.2r adjustments made to calculate project savings. An
overview of the information contained in the table is provided below:

Measure: Measure name.

Command: DOE-2.2r programming language. DOE-2.2r Keyword prefix; required by DOE-2.2r to associate Keyword with correct section
of DOE-2.2r Building Description Language (BDL) section.

Keyword: DOE-2.2r programming language to specify specific areas of input.

Action: Category of action calculator will perform to implement a specific measure by modifying a Keyword or Keyword and Command.

Base Value: The value being modified by the Action to implement a specific measure.

Efficient Value: the value that replaces the Base Value by the Action to for a specific measure.
The values listed as “From Library” refer to a database of manufacturer specifications and other standard equipment data.
Measure
Low or Medium Temperature Open Case to
New Reach-in - 15 years
Command
REFG-FIXTURE
TYPE
Change
Base Value
MULTIDECK
REFG-FIXTURE
CANOPY-KW/LEN
Remove
From Library
n/a
REFG-FIXTURE
CANOPY-KW/DOOR
Add
n/a
From Library
REFG-FIXTURE
FAN-KW/LEN
Remove
From Library
n/a
REFG-FIXTURE
FAN-KW/DOOR
Add
From Library
REFG-FIXTURE
LINE-UP-LENGTH
NUMBER-OFDOORS
Remove
n/a
From
Interface
Add
n/a
n/a
Length From
Interface/2.5
Remove
From Library
n/a
REFG-FIXTURE
HEATER-KW/LEN
HEATERKW/DOORS
Add
n/a
From Library
REFG-FIXTURE
CONDUCTION/LEN
Remove
From Library
n/a
REFG-FIXTURE
REFG-FIXTURE
22
Keyword
Action
Portland Energy Conservation Inc.
Efficient Value
MULTI-DECK-DOORS
Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
Measure
Low Temperature Reach-In to New High
Efficiency Reach-in 15 years
Command
Action
Base Value
Efficient Value
REFG-FIXTURE
COND/DOOR
Add
n/a
From Library
REFG-FIXTURE
INF-LOAD/LEN
Remove
From Library
n/a
REFG-FIXTURE
INF-LOAD/DOOR
Add
n/a
From Library
REFG-FIXTURE
Remove
From Library
REFG-FIXTURE
DEFROST-CAP/LEN
DEFROSTCAP/DOOR
Add
n/a
n/a
From Library and
Interface
REFG-FIXTURE
COIL-CAP/LEN
Remove
From Library
REFG-FIXTURE
COIL-CAP/DOOR
Add
n/a
n/a
From Library and
Interface
REFG-FIXTURE
CANOPY-KW/DOOR
Change
From Library
From Library
REFG-FIXTURE
FAN-KW/DOOR
Change
From Library
From Library
REFG-FIXTURE
COND/DOOR
HEATERKW/DOORS
Change
From Library
From Library
Change
From Library
Remove
REFG-FIXTURE
LINE-UP-LENGTH
NUMBER-OFDOORS
From Library
From
Interface
REFG-FIXTURE
TYPE
Change
n/a
SINGLEDECK
REFG-FIXTURE
CANOPY-KW/LEN
Remove
From Library
n/a
REFG-FIXTURE
CANOPY-KW/DOOR
Add
n/a
From Library
REFG-FIXTURE
FAN-KW/LEN
Remove
From Library
n/a
REFG-FIXTURE
FAN-KW/DOOR
Add
n/a
From Library
REFG-FIXTURE
CONDUCTION/LEN
Remove
From Library
n/a
REFG-FIXTURE
COND/DOOR
Add
n/a
From Library
REFG-FIXTURE
Remove
From Library
n/a
REFG-FIXTURE
HEATER-KW/LEN
HEATERKW/DOORS
Add
n/a
From Library
REFG-FIXTURE
INF-LOAD/LEN
Remove
From Library
n/a
REFG-FIXTURE
INF-LOAD/DOOR
Add
n/a
From Library
REFG-FIXTURE
REFG-FIXTURE
Portland Energy Conservation Inc.
Keyword
Add
23
n/a
Length From
Interface/(3*2.5)
MULTI-DECK-DOORS
Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
Measure
Command
Action
Base Value
Remove
From Library
n/a
REFG-FIXTURE
DEFROST-CAP/LEN
DEFROSTCAP/DOOR
Add
n/a
From Library
REFG-FIXTURE
COIL-CAP/LEN
Remove
From Library
n/a
REFG-FIXTURE
COIL-CAP/DOOR
Add
n/a
From Library
REFG-FIXTURE
CANOPY-KW/LEN
Change
From Library
From Library
REFG-FIXTURE
FAN-KW/LEN
Change
From Library
REFG-FIXTURE
TEMP-SETPT
Change
REFG-FIXTURE
SST-SUPPLY-TD
Change
REFG-CIRCUIT
EPR-SETPT
Change
From Library
From
Interface
=(TEMPSETPT)SST
SST From
Interface
REFG-FIXTURE
CANOPY-KW/LEN
Change
From Library
From Library
REFG-FIXTURE
FAN-KW/LEN
Change
From Library
REFG-FIXTURE
TEMP-SETPT
Change
REFG-FIXTURE
SST-SUPPLY-TD
Change
REFG-CIRCUIT
EPR-SETPT
Change
From Library
From
Interface
=(TEMPSETPT)SST
SST From
Interface
REFG-FIXTURE
CANOPY-KW/LEN
Change
From Library
From Library
REFG-FIXTURE
FAN-KW/LEN
Change
From Library
REFG-FIXTURE
TEMP-SETPT
Change
REFG-FIXTURE
SST-SUPPLY-TD
Change
From Library
From
Interface
=(TEMPSETPT)SST
REFG-FIXTURE
Medium Temperature Open Case to High
Efficiency Open Case - 15 Years
24
Keyword
Portland Energy Conservation Inc.
Efficient Value
From Interface
=(TEMP-SETPT)-29
SST From Interface
From Interface
=(TEMP-SETPT)-26
SST From Interface
From Interface
=(TEMP-SETPT)-22
Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
Measure
REFG-CIRCUIT
EPR-SETPT
Change
Base Value
SST From
Interface
Special Doors with Low/No Anti-Sweat Heat
for Low Temperature Reach-ins - 15 years
REFG-FIXTURE
HEATER-KW/DOOR
Change
From Library
From Library
Anti-Sweat Heater (ASH) Controls - 15 years
REFG-FIXTURE
HEATER-CTRL
Add
n/a
RELATIVE-HUMIDITY
REFG-FIXTURE
MAX-HUMIDITY
Add
n/a
80
REFG-FIXTURE
MIN-HUMIDITY
Add
n/a
60
REFG-FIXTURE
INF-SCH
Add
n/a
"Vert_Infilt_Sched"
REFG-FIXTURE
INF-SCH
Change
n/a
"Vert_Infilt_Sched"
REFG-FIXTURE
INF-SCH
Add
n/a
"Horiz_Infilt_Sched"
REFG-FIXTURE
INF-SCH
Change
n/a
"Horiz_Infilt_Sched"
SYSTEM
FAN-CONTROL
Change
CYCLING
SYSTEM
INDOOR-FAN-MODE
Change
SPEED
CONTINUO
US
SYSTEM
MIN-FLOW-RATIO
Change
1
0.01
SYSTEM
MIN-DUTY-CYCLE
Add
n/a
0.1
SYSTEM
MAX-DUTY-CYCLE
Add
0.5
REFG-FIXTURE
FAN-KW/LEN
Change
REFG-FIXTURE
FAN-KW/DOORS
Change
REFG-FIXTURE
FAN-KW/LEN
Change
REFG-FIXTURE
FAN-KW/DOORS
Change
n/a
From Library
(Base)
From Library
(Base)
From Library
(Base)
From Library
(Base)
SYSTEM
SUPPLY-KW/FLOW
Change
0.000177
0.000091
Night Covers for Open Vertical and
Horizontal Display Cases - 5 years
Evaporative Fan Controller for Walk-in
Coolers
ECMs replace shaded pole fan motors in
refrigerated display cases - 15 years
ECMs replace shaded pole fan motors in
Portland Energy Conservation Inc.
Command
Keyword
Action
25
Efficient Value
SST From Interface
INTERMITTENT
From Library (ECM)
From Library (ECM)
From Library (ECM)
From Library (ECM)
Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
Measure
Walk-In Coolers or Freezers - 15 years
Floating Head Pressure Controller - 15 years
Floating Suction Pressure Controller - 15
years
Air-Cooled to Evaporative Condenser
(Available only in dry climate zones) - 15
years
26
Command
Keyword
Action
REFG-SYSTEM
SCT-CTRL
Change
REFG-SYSTEM
SCT-SETPT
REFG-SYSTEM
Base Value
Efficient Value
WETBULB-RESET
Remove
FIXED
From
Interface
SCT-AMBIENT-DT
Add
n/a
17
REFG-SYSTEM
OVERRIDE-MIN-SCT
Add
70
REFG-SYSTEM
BACKFLOOD-SETPT
Change
n/a
[SCTSETPT] - 2
REFG-SYSTEM
SCT-THROTTLE
Change
1
CONDENSER
CAPACITY-CTRL
Change
2
TWOSPEEDFAN
REFG-SYSTEM
SCT-CTRL
change
DRYBULB-RESET
REFG-SYSTEM
SCT-SETPT
Remove
FIXED
From
Interface
REFG-SYSTEM
SCT-AMBIENT-DT
Add
n/a
12
REFG-SYSTEM
OVERRIDE-MIN-SCT
Add
70
REFG-SYSTEM
BACKFLOOD-SETPT
Change
n/a
[SCTSETPT] - 2
REFG-SYSTEM
SCT-THROTTLE
Change
2
1
CONDENSER
CAPACITY-CTRL
Change
CYCLE-FAN
VAR-SPEED-FAN
SUCTION-GROUP
TEMP-CTRL
Change
FIXED
SUCTION-GROUP
MIN-TEMP-SETPT
Add
n/a
LOAD-RESET
Suction Setpoint from
Interface
SUCTION-GROUP
TEMP-THROTTLE
Change
4
2
REFG-SYSTEM
SCT-SETPT
Change
REFG-SYSTEM
BACKFLOOD-SETPT
Change
REFG-SYSTEM
DESIGN-SCT
Change
From
Interface
[SCTSETPT] - 2
From
Interface
REFG-SYSTEM
RATED-WETBULB
Add
n/a
Portland Energy Conservation Inc.
n/a
68
VAR-SPEED-FAN
n/a
68
80
78
=DESIGNWETBULB+25
=DESIGN-WETBULB
Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
Measure
Command
Keyword
Action
Base Value
Efficient Value
=DESIGNWETBULB+25
REFG-SYSTEM
RATED-SCT
Add
CONDENSER
TYPE
Change
CONDENSER
RATED-CAPACITY
Remove
CONDENSER
KW/FAN
Remove
CONDENSER
NUMBER-OF-FANS
Change
n/a
AIRCOOLED
From
Interface
From
Interface
From
Interface
CONDENSER
FAN-EIR-TD
Add
n/a
0.0207218
CONDENSER
SPRAY-EIR
Add
n/a
0.00365679
CONDENSER
EIR-RATED-WB
Add
n/a
70
CONDENSER
EIR-RATED-SCT
Add
n/a
100
CONDENSER
CAPACITY-CTRL
Change
CYCLE-FAN
TWO-SPEED-FAN
EVAPORATIVE
n/a
n/a
1
CONDENSER
RATED-TD
Remove
From Library
Efficient Compressors — Low Temperature –
15 years
COMPRESSOR
PWR-FSSTSDT
Change
From Library
n/a
Library coefficients *
0.93
Case Lighting T10/12 to T8 - 12 years
REFG-FIXTURE
CANOPY-KW/LEN
Change
From Library
From Library
REFG-FIXTURE
CANOPY-KW/LEN
Change
From Library
From Library
REFG-FIXTURE
CANOPY-KW/DOOR
Change
From Library
From Library
REFG-FIXTURE
CANOPY-KW/DOOR
Change
From Library
COMPRESSOR
AUX-KW
Change
From Library
From
Interface
CONDENSER
CAPACITY-CTRL
Change
VAR-SPEED-FAN
CONDENSER
CAPACITY-CTRL
Change
CYCLE-FAN
TWOSPEEDFAN
REFG-FIXTURE
CANOPY-KW/LEN
Change
From Library
From Library
REFG-FIXTURE
CANOPY-KW/DOOR
Change
From Library
From Library
Change
0.000177
0.00013
ECMs for Compressor Head Fans – 15 years
Motors - Refrigeration - VFD (per hp) - 15
years
Motors — Shaded Pole to PSC in display
cases – 15 years
A
Motors — Shaded Pole to PSC in Walk-in Evaporator
Coils – 15 years SUPPLY-KW/FLOW
SYSTEM
d
d
Portland Energy Conservation Inc.
D
o
o
r
s
27
From Interface
VAR-SPEED-FAN
Standard Savings Estimation Protocol - Grocery Refrigeration System Energy Savings Calculator
Measure
LED Motion Sensors – 8 years
Door Gaskets for Solid or Reach-in Glass
Doors – 4 years
Floating Head Pressure Control on Single
Compressor Systems
Existing Case Lighting - Fluorescent to LED 6 / 8 years
28
Command
Keyword
Action
REFG-FIXTURE
LIGHTING-SCH
Change
REFG-SYSTEM
SCT-SETPT
Change
REFG-SYSTEM
BACKFLOOD-SETPT
Change
REFG-FIXTURE
CANOPY-KW/LEN
Change
REFG-FIXTURE
CANOPY-KW/LEN
Change
Portland Energy Conservation Inc.
Base Value
Light_Alway
s_On_SCH
ED
From
Interface
[SCTSETPT] - 2
From
Library*?
From
Library*?
Efficient Value
Light_Occ_Sensor_SC
HED (PNNL study)
70
68
From Library
From Library