Grocery Measure: LEDs for Reach-In Display Cases Regional Technical Forum July 21 st, 2015 Mohit Singh-Chhabra.

Grocery Measure: LEDs for Reach-In Display Cases

Regional Technical ForumJuly 21st, 2015

Mohit Singh-Chhabra

2

Presentation Objectives

• Change measure category to small saver• Approve proposed measure analysis

3

Measure Background

• Measure Name: Grocery: LEDs for Reach-In Display Cases

• Current Measure Category: Proven

• Proposed Measure Category: Small Saver

• Current Measure Status: Active

• Proposed Measure Status: Active

• Measure Sector: Commercial

• End Use: Grocery- Refrigeration

• Current Sunset Date: August, 2015

4

Staff Highlighted Areas

• Measure Identifier updates:– Discontinue “New Case” measure identifier– Add Low and Medium Temperature Case as measure

identifiers– Discontinue use of “Low Power” and “High Power”

LED identifiers • Use one average value for LED watts/ ft

• Two savings and cost streams over measure life– Applies to all pre-conditions measures with RUL < EUL

• Same methodology as EC Motors

5

What is this measure?

Replace linear fluorescent lighting (T8 or T12) with LED strips in reach-in display case

Energy Saved as LEDs have higher lumens/watt ratio than Linear Fluorescent lights– Direct Savings: Less energy required for lighting– Interactive Savings: Refrigeration energy saved as

less heat released into refrigeration system

6

Measure Specification Update

• Current workbook does not specify a product standard for LEDs

• Product standard for LEDs specified in Grocery Open Case LED Retrofit Measure– Minimum CRI of 75– Minimum of 70% of initial lumens at 50k hours– Minimum 3-year manufacturer’s warranty

• Staff recommendation to adopt Open Case product standards for Reach-In Display Case LEDs as well

7

Small Saver

• CAT proposal to change Measure Category to Small Saver– Uncertainty in baseline lamp wattage and HOO

estimate– Total remaining regional potential ~2.3 aMW• As per CBSA, approx. 49 % of regional display case

lighting is already LED• Regional potential calculated using CBSA data coupled

with proposed energy savings estimates

8

Remove Measure Identifier: LEDs in New Case

• Current workbook has a LED Upgrade for New Case measure– Same energy savings as retrofit, reduced

incremental cost• CAT research showed that most new case

doors use LED lights (Hussman, Hill Phoenix and Zero-Zone)

• Staff recommendation: Discontinue this measure

9

Remove Measure Identifier: LED Watt/ft

• Currently separate measure identifiers for Low Power and High Power LED exist– As per CLEAResult data only 4% of total installed

linear feet to be in the high wattage category• CAT proposal to have one weighted average

LED watts/ ft– No differentiation for baseline lighting on basis of

wattage or lumen output in current workbook

10

Add Measure Identifier: Case Temperature

• Interactive savings from refrigeration system account for at least 30% of total measure savings

• Current workbook applies actual installation data to forecast distribution of installation between low temp (LT) and med temp (MT) case– These data are not collected anymore

• Current Assumption ~ 65% LT, 35% MT• Recent BPA install show opposite trend ~ 35% LT, 65 % MT

• Staff proposes adding case temperature, Low and Med Temperature, as measure identifier

11

Engineering Analysis Overview

Annual energy savings are a function of:• Direct Energy Savings– Delta watts/ ft

• LED fixture Watts/ ft• Baseline fixture (T12 or T8) Watts/ ft

– Annual Hours of Operation• Interactive Savings– EER of system– Reduction in annual waste heat released to system

12

Annual Hours of Operation

• Proposed Assumption: 6,359 Hours/ year– Weighted average of CBSA hours per year Grocery

Stores are “Occupied”• Indicates hours building is open for business plus internal

maintenance

• Current Assumption: Weighted average of 18 hours/ day and 24 hours/ day grocery stores.– Based on PECI data at the time of current workbook

update– Similar data do not exist and have not been collected

13

Data Used to Update Measure: Efficient Case

CLEAResult provided CAT with a sample of LED installs from the last 6 months• Data summary:– Records: 31• 1,888 linear feet of LED install

• Average LED wattage from data: 2.7 Watts/ ft– 8 % precision at 90% confidence level

14

Data used to update the measure: Baseline Specs - T8 Lamps

• Preliminary internet research conducted to estimate common T8 lamp wattage for reach-in display case application– Upper bound ~ 11.6 W/ ft– Lower bound ~ 7.1 W/ ft– Staff proposes using an average – 9 W/ ft

• Current workbook uses wattage close to the upper bound for T8 lamps

– Ballast factor: 0.98• average of high, low output ballast. • unchanged from current workbook

15

Data used to update the measure: Baseline Specs - T12 Lamps

• Unchanged from current workbook– 13.3 W/ ft– Ballast factor: 0.9• average of high, low output ballast• unchanged from current workbook

16

Data used to update the measure : EER of Refrigeration System

• The following EER values were applied:– Medium temperature cases EER = 11 – Low temperature cases EER = 4• Source: Standard Information Workbook

17

Measure Lifetime

• LED EUL = 7.6 years (50,000 Hours)– Utilized product research conducted for 7th Plan

• EUL (Years)= EUL (Hours)/ Annual HOO

• Linear fluorescent lamp EUL: 3 Years (20,000 Hours) – Utilized product research conducted for the 7th Plan

• Linear fluorescent lamp RUL = 1 Year– DEER assumption: RUL = EUL/3– CAT recommendation: DEER assumption is

reasonable

18

Baseline is Current Practice at End of Base Lamp RUL

• What is current practice at end of RUL?– Combination of LED and T8. As per CBSA, LED cover

49% of all available linear feet of display case lighting

– Proposed current practice assumption: 51% T8, 49% LED• Full savings and cost assigned during base lamp RUL

period• Reduced savings and cost assigned for remaining LED EUL

period• Same method of analysis as the EC Motors measure

presented earlier

19

Energy Savings

Reach-in Case Lighting: T12 to LED (Retrofit)_Low Temp Case

Reach-in Case Lighting: T12 to LED (Retrofit)_Med Temp Case

Reach-in Case Lighting: T8 to LED (Retrofit)_Low Temp Case

Reach-in Case Lighting: T8 to LED (Retrofit)_Med Temp Case

-

20

40

60

80

100

120

These savings go away after 1 year

(RUL)

These savings persist through the

EUL

No comparison shown as measure identifiers have changed. Previous savings estimate ranged from 85-120kWh for T8 LED and 113-150 kWh for T12 LED upgrade

First year savings

20

Incremental Cost

• Proposed first year incremental cost = $22/ foot– Source: CLEAResult install data from 2015– Current workbook cost range $29 - $43 for

retrofits• Total Cost over EUL of measure is $7– PV Cost of current practice installation over EUL of

measure = $ 15• Same methodology as the EC Motor measure

21

Cost Benefit (TRC) Results

Reach-in Case Lighting: T12 to LED (Retrofit)_Low Temp Case

Reach-in Case Lighting: T12 to LED (Retrofit)_Med Temp Case

Reach-in Case Lighting: T8 to LED (Retrofit)_Low Temp Case

Reach-in Case Lighting: T8 to LED (Retrofit)_Med Temp Case

-

0.5

1.0

1.5

2.0

2.5

3.0

22

Delivery Verification Guidance

• Measure Identifiers: – Verify LED installation, LED strip length– Verify baseline linear fluorescent lighting type.

Options:• T8 or • T12

– Check case temperature of LED install. Options:• Medium Temperature (~38◦F) or• Low Temperature (~0◦F)

23

Decision Slide

• “I __________ move the RTF approve the LEDs for Reach-In Display Case measure as presented and:– Set the Category to ‘Small Saver’;– Set the Status to ‘Active’;– Set the sunset date to July, 2020.”