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Transcript of Landscape for Deemed Lighting Workpapers Building Code and Voluntary Program Relationship Building...
![Page 1: Landscape for Deemed Lighting Workpapers Building Code and Voluntary Program Relationship Building Code Changes Driven by Big Vision Voluntary Program.](https://reader036.fdocuments.us/reader036/viewer/2022083007/56649e685503460f94b63c86/html5/thumbnails/1.jpg)
Landscape for Deemed Lighting Workpapers
• Building Code and Voluntary Program Relationship• Building Code Changes Driven by Big Vision• Voluntary Program Driven by Least Common Denominator
• Most Conservative Assumption = Low savings• Low Savings = Low Rebate• Low Rebate = Lost Opportunity to influence purchasing
• There is a technical challenge in identifying the energy savings that can justify an effective rebate for the market while accounting for the real implications of energy codes.
![Page 2: Landscape for Deemed Lighting Workpapers Building Code and Voluntary Program Relationship Building Code Changes Driven by Big Vision Voluntary Program.](https://reader036.fdocuments.us/reader036/viewer/2022083007/56649e685503460f94b63c86/html5/thumbnails/2.jpg)
Downstream Incentive MechanismThese deemed incentives are intended to be simple and broadly applicable:• The measure case is driven by a minimum equipment specification. Customer
completes application after purchasing qualifying equipment: Verification of equipment qualification should be as simple as possible
• Only required documentation is customer-provided invoice:Incentive should depend on the manufacturer, model & quantity
• Customer location, market segment, and other details can be determined by processing center:• Invoice review verifies the equipment specification of the installed equipment
via applicable industry resources.• Account information is used to determine market segment and climate zone.
• The base case technology, specific application and wattage are unknown. The program has no way to determine specific application:• A 2x4 troffer at an office location may be installed in a hallway, private office, or
stairwell. • A 2x4 troffer at a retail location is located in the office, retail floor, or breakroom.Incentive savings should represent overall characteristics for the location type
![Page 3: Landscape for Deemed Lighting Workpapers Building Code and Voluntary Program Relationship Building Code Changes Driven by Big Vision Voluntary Program.](https://reader036.fdocuments.us/reader036/viewer/2022083007/56649e685503460f94b63c86/html5/thumbnails/3.jpg)
Other Assumptions beyond today’s scope
• Generally downstream measures assume ROB (Replace on Burnout—i.e. the fixture could not be relamped/reballasted), claiming only the energy savings from code to proposed.
• Code baseline calculations assume every project would trigger code and 100% of the projects would be code compliant.• 40 fixtures is generally the trigger point T24 code
![Page 4: Landscape for Deemed Lighting Workpapers Building Code and Voluntary Program Relationship Building Code Changes Driven by Big Vision Voluntary Program.](https://reader036.fdocuments.us/reader036/viewer/2022083007/56649e685503460f94b63c86/html5/thumbnails/4.jpg)
Key Challenge for Interior Lighting
• Recessed lighting is a key area of product growth• LED technology is making significant retrofit savings available: DLC-
listed recessed products average 93 fixture lumens / WattBut what is the code baseline assumption for a new recessed fixture?• Title 24 provides only lighting power densities:
• We looked at the CASE Reports (Codes and Standards Enhancement) written to justify savings and feasibility of Title 24 updates
• Goal is to provide fluorescent fixture performance against which any LED recessed fixture performance can be measured
![Page 5: Landscape for Deemed Lighting Workpapers Building Code and Voluntary Program Relationship Building Code Changes Driven by Big Vision Voluntary Program.](https://reader036.fdocuments.us/reader036/viewer/2022083007/56649e685503460f94b63c86/html5/thumbnails/5.jpg)
Choice of Comparison Metric
Coefficient of Utilization Fixture Efficacy (lm/W)
Availability for baseline products
CU is often not present on fluorescent fixtures; industry moving towards modeling
Calculable from spec sheets (lamp lumens x lamp qty x BF x fixture efficiency)
Availability for LED products
Not available Readily available, 3rd-party verified and listed by DLC
Variability by room geometry for a given fixture
Can vary from 30% - 80% based on room geometry & reflectances
Does not vary by room geometry
Correlation with actual task illuminance
Excellent Less strong; best for large open spaces and high reflectances
Potential Variations
DLC also lists lumen output in the 0 - 60⁰ zone, even more highly correlated with horizontal illuminance
Base case vs. measure fixture comparison via either Fixture Efficacy or Coefficient of Utilization (CU = ratio of lumens hitting task plane to lumens existing lamp):
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T24-2013-compliant Basecase Fixture Wattages
• Indoor Lighting CASE Reports for T24 2013 were based on an office lighting layout from an actual building:– “fixtures are ‘high performance T8’ fixtures, i.e. they are compliant
with the…new Federal lamp standard”• We suggest using this fixture type to define a energy savings
baseline for code-compliant recessed lighting fixtures which can be compared to measure case performance of LED troffers
• There are many possible options for fixture layouts and space geometries, but the model in this case report was selected as representative of a variety of interior applications.
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T24-2013-compliant Basecase Fixture Wattages
• Complete Building LPD for Offices: 0.8 W– (Area Category Method blend for offices: 0.86 W)
• The modeled fixtures contain HPT8 lamp & ballast:– 3T8 Parabolic Troffer with 3100-lm lamps– 72 Watts– 8’ x 10’ spacing– 43.9 maintained footcandles on workplane– 0.59 Coefficient of Utilization
• There are many possible options for fixture layouts and space geometries, but we can compare these fixtures to modern LED troffers on the basis of efficacy in lumens per Watt.
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T24-2013-compliant Basecase Fixture Wattages
• The 2x4 troffer in the CASE model most closely resembles the Cooper 2P2GAX-332S36I: – http://www.cooperindustries.com/content/dam/public/lighting
/products/documents/metalux/spec_sheets/090386_2P2GAX332_3L_T8_18C.pdf
– http://www.cooperindustries.com/content/public/en/lighting/products/recessed_linear_lighting/parabolics/_135260.ssd.html
– Also closely resembles Fixture #24 in the IES 9th Edition Handbook, p. 414
• Using either of the above as models, the fixture efficacy would be 74.7% (ratio of lamp lumens to fixture lumen output)– This yield a 68.5 lm/W fixture efficacy at initial conditions
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Base case efficacy & Energy Savings
• 68.5 lu/W for 2x4 fixtures suggests 16.5 lu/W improvement from T24-compliant baseline to DLC-minimum of 85 lu/W– Average DLC-listed fixture has measured efficacy of 92.3 lu/W– 1x4 and 2x2 fixture efficacies in the 2P2GAX parabolic line are similar
and lower, so using the 2x4 for the baseline will yield a conservative estimate• 66.5% for 1x4 232S113I; 72.2% for 2x2 2U1-5/8S33I• Both fixtures provide 40 fc illuminance with 80/50/20 reflectances at 0.72
W/sq.ft.
• N.B.: Using a fixture efficacy comparison would not work well for fixtures with highly specific distribution requirements or vertical illuminance requirements such as warehouse aisles: this analysis is for horizontal average illuminance only