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LED Case Lighting in Vertical and Semi-Vertical Open Refrigerated Cases Eric Mullendore – Energy Analyst
PECI
6/29/2010
Acknowledgements
We would like to thank the following for their support:• Avista Utilities• Bonneville Power Administration• Puget Sound Energy
Purpose
Approval for new deemed measures for LED light bars in vertical and semi-vertical, open refrigerated display cases
Agenda
Background
Measure Description
Energy Savings
Cost
Measure Life
Program Specifications
Conclusions
Background
Existing RTF approved measures for LED Lighting in Reach-in Refrigerated Display Cases
• Units are ‘Foot of LED’
• High and Low Power LED Bins with the Same Baseline
• Savings are weighted to represent mix of case
temperatures and light operating hours
• Includes option to add motion sensors
Proposed Measures
• Units are ‘Foot of Fixture’
• High and Low Power LED Bins with Different Baselines
• Savings are weighted to represent mix of light operating hours and lamp placement
• Includes option to reduce lighting levels to achieve greater savings
• No option to add motion sensor control at this time
Proposed Measures
Measure Application
Baseline Lamp Type
Baseline Lamp Count
New case or retrofit
Energy Savings
(kWh/ ft of fixture)
Measure Life
(years)
Measure Cost($/ ft of fixture)
Benefit Cost Ratio
Low Power LED T12 1 RET 65 6 $ 36.96 0.9
Low Power LED T8 1 RET 38 6 $ 36.96 0.6
Low Power LED T8 1 NEW 28 6 $ 15.98 1.4
High Power LED T12 2 RET 133 6 $ 43.58 1.5
High Power LED T8 2 RET 81 6 $ 43.58 1.0
High Power LED T8 2 NEW 62 6 $ 19.22 2.5
Delamp T12 1 RET 100 NA $ - ∞Delamp T8 1 RET 74 NA $ - ∞
Baseline
All baselines assume lighting in vertical or semi-vertical, open medium temperature refrigerated cases. (Measure can be applied to low temperature case)
Baseline variations:• Lamp (T10/T12, T8)
• Lamp Count (1 or 2)
• Lamp Placement (Inside or Outside Refrigerated Space)
• Retrofit or New
Final Rule for Commercial Refrigeration Equipment; Appendix B. USDOE. January 2009.
Measures
Change Fluorescent Fixtures to LED
High Power LED Fixtures- ≥4.5 to 9 W/ Ft of LEDInstalled under the canopy
Replaces 2 fluorescent lamps
Low Power LED Fixtures- <4.5 W/ Ft of LEDInstalled under the canopy, shelf or on the rail
Replaces 1 fluorescent lamp
Delamp FluorescentsCanopy may have +3 rows of fluorescents
May delamp in combination with LED measure
Energy Savings
Difference between annual Base and Proposed Consumption
Direct Savings: Light Fixture Energy kWW
WWHOURSkWh DRIVERLAMP
DIRECT /1000
PROPOSEDTOTALBASETOTALTOTAL kWhkWhkWh ,,
REFRIGDIRECTTOTAL kWhkWhkWh
DriverEffWW LAMPDRIVER 1
Energy Savings
Indirect Savings: Refrigeration Energy
Portion of direct consumption rejects heat inside case
Refrigeration system uses energy to remove heat
kWWEER
HEATkWh
REFRIG
LAMPREFRIG /1000
LAMPLAMPLAMPLAMP INHOURSWWhrBTUHEAT %/413.3
Energy SavingsAssumed Values- Direct Power Consumption
Fluorescent Power (W / Ft of fixture)*1 Lamp T12 in Existing Case: 10 - Grainger (40 W, 4 ft)1 Lamp T8 in Existing Case: 8 - Grainger (32 W, 4 ft)1 Lamp T8 in New Case: 7 - Manufacturer Specs (28 W, 4 ft)
Drivers / Ballast PowerMagnetic Ballast (T12) 15% of lamp power- GraingerElectronic Ballast (T8) 5% of lamp power- GraingerLED Driver 10% of lamp power- Manufacturer Spec
LED Power (W / Foot of fixture)Low Power (products range from 2.5 to 4.0): 4.0High Power (products range from 5.5 to 8.4): 7.0
*Values doubled for two lamp fixtures.
Energy Savings
Assumed Values- Indirect Power Consumption
Annual Avg. EER (Btu/hr / W)Medium Temp System 10.9 - DOE2.2R Grocery Model
methodology previously approved by RTF
% Heat transferred to Refrigeration SystemLamps Inside Refrigerated Space: 100% - DOE*Lamps Outside Refrigerated Space: 50%
- DOE*Drivers/Ballast 0% - DOE*
*Final Rule for Commercial Refrigeration Equipment; Analytical Spreadsheets. USDOE. January 2009.
www.hillphoenix.com/techInfo/handbooks/pdfs/6DMLH.pdf
*from rebates processed by PECI for +1,000 ft of medium temp cases that were retrofitted with LEDs
Case Lighting Operational Hours*Weighting applied to all measures
Weighting
*from data collected for +3,400 lamps during EnergySmart Grocer audits at 67 sites in the PNW
Placement of Single Lamp Rows in Open Cases*Weighting applied to Low Power LED measures only
Weighting
Costs
Materials: MeasureHigh Power Fixture(4 ft) $119.57
Low Power Fixture (4 ft) $ 93.08 Driver (2 Fixtures/Driver) $ 56.30 Misc. Parts (per Fixture) $ 1.63Prices from Distributor and marked up 25%
Labor Per Fixture $ 25.00
Installed Cost Per Foot of Fixture Ft of High Power Fixture $ 43.58 Ft of Low Power Fixture $ 36.96
Materials: Baseline (New Case Only) T8 Fixture- 2 Lamp $72.42 Grainger T8 Fixture- 1 Lamp $58.91 Grainger
Measure Life
LED FixturesPG&E Study 52,560 hoursProduct Claim 1 50,000 hoursProduct Claim 2 50,000 hours
LED DriversProduct Claim 1 50, 000 hoursProduct Claim 2 50, 000 hours
System24 hr / day operation 6 years18 hr / day operation 8 years
Program Specifications• Restricted to refrigerated vertical or semi-vertical, open display cases (MT or LT).
• Must replace existing fluorescent fixture with a permanently installed LED fixture and driver.
• LED fixtures must have minimum CRI of 75 and provide a minimum of 70% of initial lumens at 50,000 hrs.
• Manufacturer’s warranty must be a minimum of three years.
• Incentives paid based on length of fixture.
• LED fixtures must be controlled by any baseline controls or timeclocks or a control system equivalent to baseline controls must be installed.
• Delamping measures must be combined with an LED retrofit measure.
Conclusion
PECI seeks approval for the following deemed measures:
Measure Application
Baseline Lamp Type
Baseline Lamp Count
New case or retrofit
Energy Savings
(kWh/ ft of fixture)
Measure Life
(years)
Measure Cost($/ ft of fixture)
Benefit Cost Ratio
Low Power LED T12 1 RET 65 6 $ 36.96 0.9
Low Power LED T8 1 RET 38 6 $ 36.96 0.6
Low Power LED T8 1 NEW 28 6 $ 15.98 1.4
High Power LED T12 2 RET 133 6 $ 43.58 1.5
High Power LED T8 2 RET 81 6 $ 43.58 1.0
High Power LED T8 2 NEW 62 6 $ 19.22 2.5
Delamp T12 1 RET 100 NA $ - ∞Delamp T8 1 RET 74 NA $ - ∞