Non-Res Lighting Subcommittee

Retrofit Lighting Standard Protocol Review10/23/13

What has happened since March?

• Incorporated comments from March subcommittee meeting into protocol

• Further revised protocol and interview guide to use consistent language

• Split protocols into “retrofit” and “LPA required” instead of “pre-conditions” and ”current practice”– In reality, retrofits could have both baselines present

• Waiting to develop provisional data collection section until remainder of protocol is reviewed

Key DefinitionsSpace Use Type (SUT)• For retrofits, SUT is used to define a space inside/outside the building

with a specific use and occupancy hours of use (HOUocc)– SUT is linked to LPA requirements for installations governed by code

System• Combination of fixtures associated with a single control type within each

SUT– Takes into account individual controls effects on different fixtures

• (Ex. daylight sensors vs. manual switch in same space)

– Many fixtures within a SUT can be considered a single system if they have the same control types (i.e. multiple occ sensors in open office)

• Lighting calculator would require line item entry of fixtures and controls, (i.e. a system) with a SUT and HOUocc for each system

Project• Sum of all SUT’s and their systems is considered the project

– HVAC IF based on primary equipment used to condition entire project

PROJECT

SYSTEM

SYSTEM

SUT

SUTSUTSUT

SUT

SYSTEM

SYSTEM*

*If HOUocc are the same for all fixtures/controls. Systems cannot cross a SUT.

SUT

Example Space Data Collection• Baseline data collection

– Identify a SUT based on HOUocc and use of the space– Identify each system within a SUT

• A system is associated with a particular control type

• These systems all occur within the same SUT therefore HOUocc should be the same – Note: Systems cannot cross SUT– Eventually determine controlled HOU for each system

• Apply CSF and results of site interview

Fixture Type

Fixture Quantity

Lamps/ fixture

Wattage/ lamp

Ballast Type

Total Wattage

SUT HOUocc Control Type

Downlight 5 1 60 N/A 300Conference

room4.0 Manual Switch

Sconce 2 1 40 N/A 80Conference

room4.0 Daylight Sensor

Counter Light

2 1 100 N/A 200Conference

room4.0 Manual Switch

Gathered by interview

Example Space Data Collection

• Determine baseline power of each system• CSF is used to apply an adjustment to HOUocc

for each system– Interview answers used to roll up to annual savings

Fixture Type

Fixture Quantity

Lamps/ fixture

Wattage/ lamp

Ballast Type

Total Wattage SUT HOUocc Control Type CSF HOUbase

Daily kWh consumption

Downlight 5 1 60 N/A 300 Conference room 4.0 Manual Switch 0% 4.0 1.2

Sconce 2 1 40 N/A 80 Conference room 4.0 Daylight Sensor 40% 2.4 0.19

Counter Light 2 1 100 N/A 200 Conference

room 4.0 Manual Switch 0% 4.0 0.8

Total: 2.19

Calculator does this based on inputs

Example Space Data Collection

• Efficient Case Data Collection & Consumption– Utilize same SUT boundaries when applicable

• Note: Major change in SUTs means retrofit protocol N/A

– Same method as baseline for fixture count, quantity, etc. for each control type within a system

– Calculator can determine savings allocation• Controls savings vs. wattage reduction savings

Fixture Type

Fixture Quantity

Lamps/ fixture

Wattage/ lamp

Ballast Factor

Total Wattage

SUT HOUocc Control Type CSF HOUeeDaily kWh

consumption

HPT8 6 2 28Low

(0.85)286

Conference room

4.0Occupancy &

Daylight Sensor 40% 1.6 0.46

Total: 0.46

Where things will get tricky

• Some controls affect both wattage and HOU– Ex. Combo daylight/occ sensor

• Would need to define consumption and HOU at each power level

– Can we do so accurately with an interview guide?

• HOU required for each space (SUT)– Some programs do this for whole building only

• Plan to use interview guide to test whole building occupancy schedule to individual SUT schedules for possible simplification in the future

Interview Guide

• Need to link answers from interview guide to savings calculation components– i.e. if practitioner asks a question, the answer

needs to be used for something• Limit interview guide to only questions that

are needed to inform HOU-related estimates– Includes space HOU and controls-related HOU

• Ex. combo daylight/occ sensor HOU reduction

Interview Guide

• Need to determine if the guide asks the correct questions to get answers needed for savings estimation– Can we remove some? Or refine them to get at a

more reliable answer?• Understand that programs might use their own

interview guide to streamline process in field.– i.e. Developing an electronic guide would allow for

flexibility with many SUTs

Provisional Data Needs – Next step

• Need to collect provisional data to prove the Simplest Reliable Method is reliable compared to a best practice approach

• We don’t appear to have reliable data on:– HOU estimates– Controls Savings Fractions– Fixture wattages?

• Recent data suggests manufacturer rating may not be reliable

• Large number of possibilities given various control types and SUTs– 150+ possibilities just using current list of options

Comparison of MethodsSimplest Reliable Method Best Practice Method

HOU HOU

•Interview to obtain HOU by SUT •Meter non-controlled fixtures to derive HOU based on occupancy

Controls Savings Fraction Controls Savings Fraction

•Use default table of values for each control type

•Meter systems on individual controls to obtain % reduction

Fixture Wattage Fixture Wattage

•Use manufacturer rating •Meter fixtures to obtain in-situ rating compared to manufacturer rating*

Need to collect provisionally

* Prior best practice was to use manufacturer’s default lamp/fixture rating