ZNE Technical Lead Building Energy...2016/08/25 · Mazi Shirakh, PE ZNE Lead...
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Building Energy Efficiency Standards CBIA – CEC Building Standards Forum Vision for the 2019 Standards Mazi Shirakh, PE ZNE Technical Lead August 24, 2016
Transcript of ZNE Technical Lead Building Energy...2016/08/25 · Mazi Shirakh, PE ZNE Lead...
Building Energy Efficiency Standards
CBIA – CECBuilding StandardsForum
Vision for the 2019 Standards
Mazi Shirakh, PEZNE Technical Lead
August 24, 2016
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Public Resources Code (PRC 25402): Reduction of wasteful, uneconomic, inefficient or unnecessary consumption of energy
(a)(1) Prescribe, by regulation, lighting, insulation climate control system, and other building design and construction standards that increase the efficiency in the use of energy and water…
Warren Alquist Act Signed into law in 1974 by Governor Ronald Reagan and launched by Governor Jerry Brown in 1975
Authority & Process
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Zero Net Energy: Residential by 2020 and Nonresidential by 2030
CARB Climate Change Scoping Plan
California Long Term Energy Efficiency Strategic Plan
Policy Drivers For Building Standards
Governor's “Clean Energy Jobs Plan”
Governor Brown’s ZNE goals – focused on ZNE building code requirement by 2020 for newly constructed residential buildings – get there in 3 code cycles (2013, 2016, 2019)
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2019 Standards: the 2015 IPER VisionA ZNE Design Designation Building is one where the value of the net amount of energy produced by on-site renewable energy resources is equal to the value of the energy consumed annually by the building, at the level of a single “project” seeking development entitlements and building code permits, measured using the California Energy Commission’s Time Dependent Valuation (TDV) metric.
A ZNE Design Designation Building meets an Energy Use Intensity (EUI) value designated in the Building Energy Efficiency Standards by building type and climate zone that reflect best practices for highly efficient buildings.
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Life Cycle Costing
Standards measures must be cost effective1. Using Life Cycle Costing Methodology (LCC)
i. Discounted cash flows for costs and benefits
ii. Accounts for maintenance costs/benefits
iii. Appropriate discount rates and life of measures -
30 years for residential measures15 years for nonresidential measures
2. Time Dependent Valuation (TDV)
i. Value of gas and electricity changes depending on the season and the time of day
ii. 8,760 TDV multipliers for each hour of the year
iii. Favors measures that save energy during high demand periods
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Zero Net Energy Standards
Achieve additional energy savings from building components regulated under Title-24 to reach ZNE goals
Integrate onsite generation into building Standards to accomplish ZNE
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Impacts of Building Standards on Home Energy Use
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Focus on CA Climate DiversityStandards set expectations for climate-specific designsCA weather data captures statewide coincident peak demand climate conditions
California Standards for California Climates
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Coastal - 1, 3, 5, 6, 7, 8
Inland - 2, 4, 9, 10
Central Valley - 11, 12, 13
Desert - 14, 15
Mountains -16
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2019 Standards – PV Tradeoff1. The 2016 Standards provided a flexible PV tradeoff credit that was just
large enough to trade away the HPA and HPW
2. The credit was provided to allow some builders more time to adopt the HPA and HPW as common building practice
3. The 2013 Standards envelope features became the “baseline” for using the PV credit
4. For the 2019 Standards, the PV tradeoff will no longer be available to trade away the 2016 HPA and HPW
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2016 Residential Standards ApproachA whole new approach for Standards development:1. Not focused on specific measures: instead, staff defined performance targets,
such as U-factors, needed to meet the ZNE goals
2. Invited builders, manufacturers, and suppliers to partner with staff to come up with solutions that meet equivalent performance
3. CBIA hosted forums in April and November of 2014 to communicate the ZNE vision and engage industry in creating new solutions – allowing the free market to settle on the most promising solutions
4. Worked with the CPUC and IOUs to provide incentives, education, and outreach supporting the transition of the building industry to the new practices needed for these solutions in advance of the effective date
The result was a cooperative and innovative collaboration between staff, builders, manufacturers, and utilities. The industry as a whole rose to the challenge with multiple solutions for both HPAs and HPWs.
The 2019 Standards are expected to follow the same cooperative approach
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2016 Standards Range of Options
High Performance Attics (HPA) performance defined by:Roof deck insulation equivalent to R-13 insulation below deck and R-38 ceiling insulation. Insulation choices may include spray foam, batt, or blown-in, and SIP panels.
However, the builder has many other options, all meeting the HPA performance:
1. R-6 continuous insulation with radiant barrier2. Hybrid roofing systems combining insulation and higher roof
reflectance3. Ducts in conditioned space (DCS)4. Ducts in sealed or unvented attics5. Or other solutions suggested by the industry
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2016 Standards Range of Options
Above Deck Insulation
Hybrid Roofing
Sealed Attic with Blown-in Insulation
Ducts in Conditioned Space
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2016 Standards Range of Options
High Performance Walls (HPW) – Performance Defined By:
R19 cavity + R5 Continuous Insulation – U-Factor (Approx 0.051)
However, the builder has many other options, all meeting the HPA performance:
1. 2x4 @ 16” OC, R15 + R-8 CI (0.051)
2. 2x6 @ 24” OC, R19 + R-5 CI (0.049)
3. 2x6 @ 24” OC R21 + R-4 CI (0.048)
4. Staggered studs with batt insulation or spray foam
5. Structurally Insulated Panels (SIPs)
6. Or other solutions suggested by the industry
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2016 Standards Other Measures
Instantaneous (Tankless)Water Heaters• Basis of prescriptive and performance approach – set
on federal IWH performance, currently at Energy Factor of 0.82
• For tanks less than 55 gallons, allow prescriptive alternative for standard storage water heaters in combination with: Quality Insulation Installation (QII), with either
Compact pipe distribution design, or
Insulating all half inch and larger hot water pipes
For tanks above 55 gallons, no QII is required, only combine with compact distribution or pipe insulation
• Use the performance path for additional options, such as electric heat pump water heaters
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2016 Standards Other MeasuresHigh Efficacy Lighting
1. high efficacy high CRI lighting throughout the house, paired with JA8 compatible controls
2. All recessed downlights in ceilings must be high efficacy
3. Allow luminaires with screw base sockets as high efficacy if the socket is populated with a high quality, JA8 compliant lamp at the time of inspection; exception for downlights
2016 lighting improvements resulted in large energy savings, reduction in plug loads and PV size needed to get to ZNE.
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Impact of 2016 Standards on the PV Size
1. To get to ZNE, the 2016 improvements results in a PV system that is 13% smaller in cooling CZs
2. Or about 900 watts smaller
3. Or about 70 square feet smaller foot print for the PV system
PV footprint on the roof in extreme CZs will be an issue for the ZNE goal; more efficiency helps to reduce the PV footprint area.
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2019 Standards ProcessWe are very early in the process, the pre-rulemaking is et to begin soon
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2019 STANDARDS UPDATE SCHEDULEDATE MILESTONES
February 2016-July 2016 Measures Identified and approvalAugust 2016 to June 2017 Stakeholder meeting/workshop & final staff workshop June 1, 2017 CASE Reports submitted to the CECDecember 1, 2017 45-day Language HearingsMarch 1, 2018 Adoption of 2019 Standards at Business MeetingJune1, 2018 to November2018
Staff work on Software, Compliance Manuals, Electronic Documents Available to Industry
November 1, 2018 Approval of the ManualsJanuary 1, 2019 Software, Compliance Manuals, Electronic Documents Available
to IndustryJanuary 1, 2020 Effective Date
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2019 Standards Process1. Update the TDV values to reflect the current NG and Electricity costs
2. Update the Life Cycle Costing (LCC) assumption based on TDV and other parameters
3. Using the updated TDVs, evaluate cost effectiveness of additional envelope measures for the extreme cooling climate zones; possible measures include additional roof deck insulation for high performance attics and improving the wall U-factors
4. Using the updated TDVs, determine the cost effectiveness and size of PV systems for each climate zone.
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Mazi Shirakh, PEZNE [email protected]
Payam Bozorgchami, PEProject Manager, 2019 Building [email protected]
Larry Froess, PECBECC Software [email protected]
Standards Contact Information – Energy Commission
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Christopher MeyerManager, Building Standards [email protected]
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Questions?
