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

Calculations &Variable Assumptions

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 $ - ∞