Item 7 Austin Energy Green Building Code Updates Presentation — original pdf
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May RMC Meeting Energy Code Review Kurt Stogdill Manager, Green Building and Sustainability . 5/18/2021 © 2020 Austin Energy Significant 2021 IECC Changes Agenda • • • • • Stakeholder Input Code Impacts Affordability Next Steps 2 Significant 2021 Residential IECC Changes 3 2021 IECC Changes • 57.7% Administrative • 17.1% Decreased Energy • 12.2% Minimal Energy Impact • 10.6% Not Applicable to ATX • 2.4% Increase Energy Consumption Published 2021 IECC can be accessed for free at: codes.iccsafe.org/content/IECC2021P1/iecc- residential-provisions 4 Lighting Changes • Interior lighting – all permanently installed lighting fixtures to have high efficacy lighting sources • Exterior lighting for low-rise multifamily to comply with commercial energy code • Lighting controls to be installed – interior and exterior 6 Other Paths of Compliance Performance Path Updates to baseline • • • • Added Dehumidstats Update to water heating • Credit for good design Update to mechanical ventilation • • • ERI Path Updated backstop (limits trade- offs to envelope requirements) to ERI (Energy Rating Index) path Renewables – added 5% cap for compliance Lowered ERI targets for compliance- lower is “better” • ATX to stay at 59 8 Additional Efficiency Option Packages Prescriptive OPTION 1: Enhanced envelope performance option • 5% better envelope performance Performance Pick one option from prescriptive list • OPTION 2: Efficient HVAC equipment performance option • OR achieve 5% better than code ERI • Achieve 5% better on Energy Rating Index • Furnace >= 95 AFUE and AC >= 16 SEER • Air Source Heat Pump >= 10 HSPF/16 SEER • Ground Source Heat Pump >= 3.5 COP Fossil fuel water heater >= 0.82 EF • • Electric water heater >= 2.0 EF • Solar water heater >= 0.4 Solar Fraction OPTION 3: Reduced energy use in service water heating option OPTION 4: More efficient duct thermal distribution system option • 100% of ducts and air handler inside building thermal envelope • 100% of ductless or hydronic system inside building thermal • 100% of duct thermal distribution system located in conditioned envelope space OPTION 5: Improved air sealing and efficient ventilation system option • Air Leakage <= 3.0 ACH50 • HRV (75% Sensible Recovery Efficiency) or ERV (50% Latent Recovery/Moisture Transfer) 9 Local Amendments • Retained existing amendments where more stringent with published code; deleted amendments where now incorporated in published code • Deleted requirement for gas water heating with adjacent gas service • Added new code retaining timer language of • Added exception for open-source demand response technology • Retained exception for heat pump water heaters 10 Significant 2021 Commercial IECC Changes 11 Generally Thermal envelope certificate required Posted in mechanical room listing wall insulation levels, window performance, and results of testing Additional efficiency requirements section SUBSTANTIALLY revised Occupancy specific tables, points-based system based on measure pursued and climate zone Alternative compliance approved by code official Specifically allows code official to recognize separate programs as equivalent to energy code compliance Home Energy Rating System (HERS) rating allowed, dwelling units in medium to high-density multifamily 12 Building Envelope Air barrier testing for Residential & Institutional occupancy Interlocks on mechanical systems, openings >40 sq. ft. Slab edges part of definition “wall above grade” Envelope table updates, fenestration changes (windows) 13 Mechanical Fault detection and diagnostics (FDD), >100,000 sq. ft. “FDD = A software platform that utilizes building analytic algorithms to convert data provided by sensors and devices to automatically identify faults in building systems and provide a prioritized list of actionable resolutions to those faults based on cost or energy avoidance, comfort, and maintenance impact” Mechanical efficiency tables from ASHRAE 90.1 Variable Refrigerant Flow (VRF), computer rooms, Dedicated Outside Air Systems (DOAS) Energy recovery systems (heat recapture for air) Guestroom setback (hotel rooms when unoccupied) 14 Automatic receptacle control – mandates % of controllable receptacles Lighting & Power Parking garage lighting control, new section Electrical transformer efficiency Energy monitoring, >25,000 sq. ft. Hot water pipe length or volume restriction Water 15 Local Amendments Dropped • • • • Water heater timers (adding Demand Response alternative) • Registered design professional (related to commissioning) Roofing (now part of published code) Interlocks (now part of published code) Commissioning (now part of published code) Encapsulation (to allow insulation to more closely match its labeled value) Recommended to keep • • Ventilation filtration, *MERV 6 (sealing of plenums and filtration) • Window performance (carve out for Design and Compatibility standards) • Demand response (to require open-source demand response capability) * MERV= Minimum Efficiency Reporting Value is a measurement scale designed to report the effectiveness of air filters 16 Outreach 17 Residential Stakeholder Engagement Stakeholder engagement process Over 30 external stakeholders representing a variety of interest groups including American Institute of Architects, Home Builder’s Association Presented to American Institute of Architects Over 25 internal stakeholders Three notices provided, announcing opportunities to engage with all the residential technical codes PublicInput: vehicle for further engagement Documentation provided: Summary of local amendment changes, proposed ordinance, summary of stakeholder comments and responses 211 views to date, 9 non-repetitive suggestions addressing solar ready, EV ready, electric ready, current gas water heating requirements, ERI, air infiltration, attic insulation, and windows 61 comments received regarding EV ready and Electric ready Stakeholder comments led to a proposed code change for attic insulation at the attic roofline • • • • • • • Boards and Commissions Affordable builders Architects Custom builders - Sustainable Developers - Affordable Energy Code testers/HERS raters Engineering firms Interest groups Manufacturers Mechanical contractors Multifamily builders Production builders 4.5% 9.1% 13.6% 4.5% 4.5% 4.5% 36.4% 4.5% 4.5% 4.5% 9.1% 18 Commercial Stakeholder Engagement Commercial stakeholder engagement process initiated 1/14/2021 • Over 100 external stakeholders, compiled over 15 years representing a broad swath of the community both locally and nationally Presented to American Institute of Architects • • Over 50 internal stakeholders, including SPOCs. Six notices provided, announcing opportunities to engage with all the technical codes Academia Architect Code Consulting Commissioning Contracting Development Engineering Interest Group Mechanical Engineer Trade Representative 6% 18% 8% 5% 10% 10% 18% 7% 7% 11% 6 19 9 5 11 11 19 7 8 12 107 PublicInput: vehicle for further engagement: • Documentation provided: Summary of published code changes, summary • of local amendment changes, proposed ordinance 183 views, 8 non-repetitive suggestions addressing commissioning, solar/EV ready, support of current activity, consideration of site/source, etc. Boards and Commissions 19 Projected Code Impacts 20 Projected Energy Savings Over 2016 COA Energy Code Projected Savings by Sector Commercial 31,404 MWh | 10% Residential 5,249 MWh | <4% Based on FY2020 building permits Savings Percentage by Building Type Hospital School Hotel Restaurant Retail Office Multifamily Single family high-rise small/large strip mall stand-alone medium/large small high-rise mid-rise low-rise affordable typical 0% 5% 10% 15% 20% 21 Projected Affordability Impacts 22 Affordability Impact of Adoption of 2021 IECC Insulation- biggest single energy savings measure $430 increase in construction price of home Savings of $27/year Peak demand decreased by approx. .5 kW With additional energy package (reference slide 9) • Choose 1 of 5 options or modeling • Option 3- efficient water heating Approx. $1,430 increase in construction cost Savings- up to$102/year 12.8% energy savings over standard approach Peak demand will decrease by 2.2 kW • • • • • • • 23 Next Steps 24 Next Steps • Recommendation from RMC • Need by May 20th to meet posting requirements for Council • Continued work on any outstanding issues • Customer Choice Transportation • • We will report back to RMC in June with proposed path forward and timeline 25 Thank You Questions? Kurt Stogdill Kurt.Stogdill@austinenergy.com 512-413-1255 ©2020 Austin Energy. All rights reserved. Austin Energy name and logo as well as Austin Energy Green Building name and logo, and combinations thereof are trademarks of Austin Energy, the electric department of the City of Austin, Texas. Other names are for informational purposes only and may be trademarks of their respective owners.