grocery store measures door gasket, automatic door closers, and strip curtain laboratory testing
TRANSCRIPT
Grocery Store Measures
Door Gasket, Automatic Door Closers, and Strip Curtain
Laboratory Testing
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Agenda1. Field Research – PECI2. Lab Testing – BPA3. EnergySmart Grocer Program Changes -
BPA
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I. Field Research PECI captured following gasket data
Door type Product Door Manufacturer Gasket Type Door Dimensions Length of damage Description of damage
Captured data for 350 reach-in and walk-in doors. Mainly C-Stores
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Field Research Results
Case Type Average Damage (inches)
Low Temp Reach-n 12
Med Temp Reach-in 27
Walk-in Low Temp 12
Walk-in Med Temp 31
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Door Open Times (Preliminary)
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0 5 10 15 20 25 30 35 40
Logger Number
Do
or
Op
en
(%
)
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Type of Case
0
2
4
6
8
10
12
14
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Low Temp Reach In Medium Temp Reach In Low Temp Walk In Medium Temp Walk In
Nu
mb
er
in S
am
ple
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Average Door Open Times
Case Type Avg. Open Time
Low Temperature Reach-In 8.0%
Low Temperature Walk-In 4.5%
Medium Temp Reach-In 0.5%
Medium Temp Walk-In 10%
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Cost Information
Average of Total Linear FeetDoor Type Total $/lnft Total Door CostReach-In Low Temp 15 7 107$ Reach-In Med Temp 17 5 83$ Walk-In Low Temp 17 7 116$ Walk-In Med Temp 16 5 79$ Walk-In Med Temp - Glass entry Door 19 5 95$ (blank)Grand Total 16
Auto-closer (reach-in) $36 - $40Auto-closer (walk-in) $100 - $250
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II. Lab Testing
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Lab Testing Plans Door Gaskets
3 Cases: Low Temperature Walk-In, Medium Temperature Walk-In, Low Temperature Reach-In
3 Conditions: No Gasket, Typical Damaged Gasket, Fully Functional Gasket
Strip Curtains 2 Cases: Low Temperature Walk-In, Medium
Temperature Walk-In Automatic door opening of 4 minutes/2 hours. Compare to Fully Functional Gasket
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Laboratory Testing – Interim Results
Completed testing and report on low temperature reach-in.
Completed testing and report on low temperature walk-in.
Completed testing on medium temperature walk-in – report in 1 week.
Completed testing on strip curtains – report in 2 weeks.
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Testing Procedures & Discussion Emerson Climate Technologies
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Low Temperature Reach-In Results
Parameter Full Gasket Damaged
Gasket No
Gasket Number of Defrost cycles per day 1 2 4
Average Ambient Dry Bulb Temperature (°F) +75.1 +74.5 +74.6 Average Ambient Wet Bulb Temperature (°F) +63.8 +64.5 +63.1
Average Condenser Air Intake Temperature (°F) +74.8 +72.5 +73.5
Average Simulator Temperature (°F) 0.0 -0.5 +29.6 Minimum Simulator Temperature (°F) -12.0 -13.1 +15.0 Maximum Simulator Temperature (°F) +15.0 +15.0 +47.2
Condensate Drainage per Defrost (oz) 6.8 19.5 83 Condensate Drainage per Day (oz) 6.8 39.0 332
(1)Duty Cycle (%) (1)70.8% (1)75.1% (1)94.3% Average Power (Watts) 2190.2 2260.3 2578.8
24 Hour Energy (kW-hrs) 52.6 54.3 (2)61.9 Energy Increase per Day (kW-hrs) Baseline +1.68 (2)+9.33
% energy increase Baseline 3.2% (2)17.7%
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Low Temperature Walk-In Results
Parameter Full Gasket Damaged
Gasket No
Gasket Number of Defrost cycles per day 2 2 2
Average Ambient Dry Bulb Temperature (°F) +74.0 +75.0 +76.6 Average Ambient Wet Bulb Temperature (°F) +60.8 +61.7 +63.5
Average Condenser Air Intake Temperature (°F) +73.7 +74.8 +76.3
Average Simulator Temperature (°F) -4.7 -4.4 -3.7 Minimum Avg. Simulator Temperature (°F) -5.0 -4.7 -3.9 Maximum Avg. Simulator Temperature (°F) -4.5 -4.2 -3.3
Condensate Drainage per Defrost (oz) 13.0 22.6 168 Condensate Drainage per Day (oz) 26.0 45.2 336
(1)Duty Cycle (%) (1)38.4% (1)43.3% (1)72.3% Average Power (Watts) 2279.7 2358.3 3620.4
24 Hour Energy (kW-hrs) 54.7 56.6 86.9 Energy increase per day (kW-hrs) Baseline +1.9 +32.2
% energy increase Baseline 3.5% 58.9%
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Lab Testing vs Real World
Lab Test Real World Energy Savings Impact
Ambient humidity control No ambient humidity control +/- Average humidity could be more or less than test conditions.
No door openings
Door openings - Product stocking, consumer purchases
- Door openings = more ambient air into case and more compressor energy use.
Gasket damage = gap Gasket damage = tear - How much tear damage is equal to 1 foot of gap?
Time initiate/temperature terminate defrost
Timed defrost
+ Temperature-termination defrost control saves energy.
Single dedicated compressor Multiple compressors &/or multiple cases on single compressor No impact
New Reach-In Case Old/Refurbished, etc
+ New is more energy efficient (better insulation, better condition, controls, …)
+ = Energy savings in the Real World are greater than in the Lab.
- = Energy savings in the Real World are less than in the Lab.
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ESG Program Changes Currently - assign 0 kWh/yr to door
gaskets and closers for approx. 10 miles of installed gaskets and over 150 automatic door closers.
Now – Assign energy savings based on lab testing (slides following).
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Estimated Annual Energy Savings
Reach-In Low Temp Walk-In Low TempkWh/door kWh/door
Gasket Condition
Amount of Damage, ft
Adjusted Savings
Amount of Damage, ft
Adjusted Savings
Good 0 0 0 0
Damaged 1 190 2 662
No Gasket 11 1,041 21.5 11,224
Gaskets - Tested
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Estimated Annual Energy SavingsGaskets – Proposed
Case TypeAverage Damage
(inches)Average Cost
($/door)Energy Savings (kWh/yr/door) B/C
Low Temp Reach-in 12 $107.22 190 0.30Med Temp Reach-in 27 $82.95 143 0.29Low Temp Walk-in 12 $116.38 331 0.47Med Temp Walk-in 31 $78.79 285 0.59
a. Energy Savings adjusted for average door open times and average damage. b. Medium Temp Walk-In assumed to be 1/3 of Low Temp. Subject to revision pending lab test results.c. Medium Temp Reach-In assumed to be 1/3 of Low Temp.d. B/C ratio assumes 4 year measure life
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Estimated Annual Energy SavingsAuto Door Closers (= No Gasket)
Case TypeAverage Cost
($/door)Energy Savings (kWh/yr/door) B/C
Low Temp Reach-in $40 1,561 6.6Med Temp Reach-in $40 520 2.2Low Temp Walk-in $200 5,612 4.7Med Temp Walk-in $200 1,871 1.6
a. Energy Savings adjusted for average door open times. Assume door is closed 50% of the time.b. Medium Temp Walk-In assumed to be 1/3 of Low Temp. Subject to revision pending lab test results.c. Medium Temp Reach-In assumed to be 1/3 of Low Temp.d. B/C ratio assumes 4 year measure life
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Next Steps Complete test reports on Medium
Temperature Walk-In and Strip Curtains. Evaluate results with wider audience
including peer review. Incorporate revised results into ESG, as
appropriate. RTF provisionally deemed measures