LED Case Lighting With and Without Motion Sensors

Michele Friedrich – Sr. Engineer

PECI

1/5/2010

Acknowledgements

We would like to thank the following utilities for support• BPA• PSE• AVISTA

Purpose

Approval to modify LED case lighting deemed measures and add LED case light motion sensor measures.

Agenda

BackgroundPECI experience

Market

Measures to approveDescription of Measure

Baseline

Measure

Energy Savings

Cost

Measure Life

Technical and Program Specifications

Conclusions

Background

PECI previous experienceRTF approved LED case lighting measures- 337,000 kWh saved in 2009 for

BPA

Difference between current and proposed measures:• Current measures 18 hr or 24 hr/ day case lighting and LT or MT.

New measures weight the savings using rebate data.• Current units are “per linear foot of case”. New units are “per

linear foot of LED”.• Current measure has one LED light bar wattage. New measures

have two bins for side bars and mullion bars.• New measures for motion sensors.

Background

PECI previous experienceMeasure restricted to Reach-in cases

Obtained weighting from PECI rebate applications • LED demand – Side bars use ½ of Mullion bars’ watts• LT and MT rebate split is not changing over time• 18 hr vs. 24 hr case light operation split is constant

Fluorescent Bulb Temp Hours TotalT12 Low 18 5%

24 37%Med 18 7%

24 5%T8 Low 18 18%

24 18%Med 18 3%

24 6%

Background

PECI previous experienceLED case lights installed in 2009 from PECI rebates - % of lights

by Watts per linear foot of lamp

BackgroundMarket Size

Number of Stores

Small Store0 - 5000

Sq Ft

Medium Store5000 - 35,000

Sq Ft

Large Store35,000 +

Sq Ft

BPA Participating Utility Customer Count 768 375 128

Seattle City Light, Tacoma Power & Snohomish PUD 881 208 165

Remaining Region (Trust, PSE, Avista, Idaho Power) 2,638 933 469

Totals For Region 4,287 1,516 762

Potential kWh Small Store Medium Store Large Store

LED Case Lighting 17,921,200 34,848,000 28,670,400

Measures

Description of Measure• Refrigerated, Reach-in, Display Case Lighting

◦ Reduce lamp electrical demand: Change Fluorescent to LED◦ Reduce Hours: Incorporate Motion Sensor

Measures for ApprovalBaseline

LampWith or w/o

Motion Sensor

LED wattage New case or retrofit

Energy Savings (kWh/yr- ft of

LED)

Measure Life

(years)

Measure Cost ($/ft of LED)

Benefit Cost Ratio

T12 w/o M.S. 4 to7.5W/FT RET 105 6 $ 46.50 1.2

T12 w/o M.S. <=4W/FT RET 154 6 $ 32.00 2.3

T8 w/o M.S. 4 to7.5W/FT RET 59 6 $ 46.50 0.8

T8 w/o M.S. <=4W/FT RET 104 6 $ 32.00 1.7

T8 w/o M.S. 4 to7.5W/FT NEW 59 6 $ 27.50 1.4

T8 w/o M.S. <=4W/FT NEW 104 6 $ 12.50 4.3

LEDw/ Motion

Sensor 4 to7.5W/FT RET 27 8 $ 2.00 6.3

LEDw/ Motion

Sensor <=4W/FT RET 14 8 $ 2.00 3.1

11

Old Measures 18hr/day

EnergySmart Grocer Measuers Unit of measure Energy Savings (kWh)

Measure life Measure Cost ($2000)

RTF B/C Ratio

Case Lighting - Low Temp - T8 to LED, retrofit

Linear Feet of Case

148 8 79.32$ 0.9

Case Lighting - Low Temp - T12 to LED,retrofit

Linear Feet of Case

265 8 79.32$ 1.4

Case Lighting - Med Temp - T8 to LED, retrofit

Linear Feet of Case

117 8 79.32$ 0.8

Case Lighting - Med Temp - T12 to LED, retrofit

Linear Feet of Case

208 8 79.32$ 1.1

Case Lighting - Low Temp - T8 to LED, new

Linear Feet of Case

148 8 82.76$ 0.9

Case Lighting - Med Temp - T8 to LED, new

Linear Feet of Case

117 8 82.76$ 0.8

Input for B/C calculator for New Measure cost is $99/ln ft in 2008 Dollars

12

Old Measures, 24 hr/day

EnergySmart Grocer Measuers Unit of measure

Energy Savings (kWh)

Measure life Measure Cost ($2000)

RTF B/C Ratio

Case Lighting - Low Temp - T8 to LED, retrofit

Linear Feet of Case

198 6 79.32$ 0.8

Case Lighting - Low Temp - T12 to LED,retrofit

Linear Feet of Case

353 6 79.32$ 1.3

Case Lighting - Med Temp - T8 to LED, retrofit

Linear Feet of Case

155 6 79.32$ 0.7

Case Lighting - Med Temp - T12 to LED, retrofit

Linear Feet of Case

278 6 79.32$ 1.1

Case Lighting - Low Temp - T8 to LED, new

Linear Feet of Case

198 6 82.76$ 0.9

Case Lighting - Med Temp - T8 to LED, new

Linear Feet of Case

155 6 82.76$ 0.7

Input for B/C calculator for New Measure cost is $99/ln ft in 2008 Dollars

MeasuresDescription of Baseline

Across all baselines:◦ Reach-in refrigerated display case.

Different baselines for implementation◦ Lamp (T12, T8, LED)◦ Retrofit or New

MeasuresDescription of Measure

Different measures for implementation◦ Change Fluorescent fixture to LED

» LED wattage – Side bars less than Mullion Bars. Addressed with bins (W / linear ft of LED)

◦ Add Motion Sensor to LED» LED wattage – Side bars less than Mullion Bars.

Addressed with bins (W / linear ft of LED)

Energy Savings

Difference between annual Base and Proposed Consumption

Direct – Light Fixture Energy

Refrigeration EnergyPortion of Direct consumption rejects heat inside case (refrig load)

PROPOSEDTOTALBASETOTALTOTAL kWhkWhkWh ,, REFRIGDIRECTTOTAL kWhkWhkWh

kWW

DFWHOURSWHOURSkWh LAMPLAMP

DIRECT /1000

12.0 %100%20

DRIVERLAMPLAMPDRIVER INCASEDFWHRWHRWhrBTUHEAT %2.0/413.3 %20%100

LAMPLAMPLAMPLAMP INCASEWHRWHRWhrBTUHEAT %2.0/413.3 %20%100

Energy SavingsRefrigeration system uses energy to remove heat

ASH EnergyWe found no literature on effectiveness of Anti-Sweat Heaters (ASH)

from the reduction of case lighting energy.

PNNL demonstrations found no frost or condensation on doors after LED with motion sensors were in operation for over 3 months.

kWWEER

HEATHEATkWh

REFRIG

BALLASTLAMPREFRIG /1000

Energy Savings

Assumed ValuesFluorescent Wattages (W / linear foot of lamp)• T12: 14.6 - GRAINGER (73 W, 5 ft) (PG&E WP = 75)• T8: 11.6 - GRAINGER (58 W, 5 ft) (PG&E WP = 58)

Drivers / Ballast % additional Wattage (DF)• Fluorescent Ballast 5% of lamp - GRAINGER• LED driver 5% of lamp - LED POWER

LED Wattages (W / linear foot of lamp)• Side (less than 4): 3.5 – PECI rebates• Mullion (between 4 and 7.5): 7.0 – PECI rebates

Energy savings

Energy SavingsAssumed Values

Refrigeration (All PNW Climate Zones)• Annual Avg. EER (Btu/hr / W)

◦ Medium Temp: 10.9 - DOE2.2R grocery model, PNW◦ Low Temp: 5.0 - DOE2.2R grocery model, PNW

% Heat transferred to Refrigeration System• Lamps: 100% - inside case (neglect conduction)• Drivers/Ballast 50% - observations (some in, some out)

Energy SavingsAssumed Values

LED dimming when un-occupied: 20% - PNNL, LARGE CHAIN, SMUD

Motion Sensor % of lighting operational hours at reduced wattage• 18 HR /day case lighting: 29% - PNNL (EUGENE)• 24 HR /day case lighting: 39% - PNNL (EUGENE, POULSBO)

Energy Savings

Graph of PNNL daily motion sensor activated light data

Energy Savings

SMUD:51% Hrs at 20% W

Data from SMUD and Large Chain case lighting motion sensor demonstrations

Large Chain

Measure Costs

Cost Inputs:• Fluorescent (new case):$60.00 / door - Hussmann• LED lighting equipment:

◦ Side Bar: $111 / 5 ft bar - PNNL◦ Center Bar: $185 / 5 ft bar - PNNL◦ Labor: $60 / door - PNNL

• Motion Sensor◦ Equipment: $65 / 25 ft of case - PNNL, LED Power◦ Labor: $65 / 25 ft of case - PNNL, LED Power

Measure Life Assumptions

LED Lights52,560 hours PG&E Study

70,000 hours LED POWER

No Motion Sensor• 24 hr / day: 6 years (52,560 / 8760)• 18 hr / day: 8 years (52,560 / 6570)

With Motion Sensor• 24 hr / day: 9 years [52,560/ (8760*(0.61 + 0.39*0.2))]• 18 hr / day: 10 years [52,560/ (6570*(0.71 + 0.29*0.2))]

Motion Sensor• 8 years PG&E work paper for space lighting motion sensors

Program Specifications For the Measure Terms and Conditions

• Restricted to refrigerated reach-in display cases only.• Must replace existing reach-in refrigerated display case

fluorescent fixture with a LED fixture.• Fluorescent magnetic ballasts can not be used to power the LED.• LED lighting system must be a permanently installed fixture.• LED lights 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.• The motion sensor must reduce lighting load to 20% or less when

unoccupied.• Case lights on existing timer must continue to turn lights off at

night after installing motion sensor.• Incentives paid based on linear feet of LED. Rebate and energy

savings values vary based on lamp size (T8 or T12) and LED wattage (low or high).

ConclusionApproval to modify LED case lighting deemed measures and add LED case light motion sensor measures.

Baseline Lamp

With or w/o Motion Sensor

LED wattage New case or retrofit

Energy Savings (kWh/yr- ft of

LED)

Measure Life

(years)

Measure Cost ($/ft of LED)

Benefit Cost Ratio

T12 w/o M.S. 4 to7.5W/FT RET 105 6 $ 46.50 1.2

T12 w/o M.S. <=4W/FT RET 154 6 $ 32.00 2.3

T8 w/o M.S. 4 to7.5W/FT RET 59 6 $ 46.50 0.8

T8 w/o M.S. <=4W/FT RET 104 6 $ 32.00 1.7

T8 w/o M.S. 4 to7.5W/FT NEW 59 6 $ 27.50 1.4

T8 w/o M.S. <=4W/FT NEW 104 6 $ 12.50 4.3

LEDw/ Motion

Sensor 4 to7.5W/FT RET 27 8 $ 2.00 6.3

LEDw/ Motion

Sensor <=4W/FT RET 14 8 $ 2.00 3.1