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Residential Indoor Air Quality – Draft Report Measure Number: 2019-RES-IAQ Residential IAQ

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Residential Indoor Air Quality – Draft Report Measure Number: 2019-RES-IAQ Residential IAQ Codes and Standards Enhancement (CASE) Initiative 2019 California Building Energy Efficiency Standards Residential Indoor Air Quality – Draft Report Measure Number: 2019-RES-IAQ Residential IAQ April 2017 This report was prepared by the California Statewide Codes and Standards Enhancement (CASE) Program that is funded, in part, by California utility customers under the auspices of the California Public Utilities Commission. Copyright 2017 Pacific Gas and Electric Company, Southern California Edison, Southern California Gas Company, San Diego Gas & Electric Company, Los Angeles Department of Water and Power, and Sacramento Municipal Utility District. All rights reserved, except that this document may be used, copied, and distributed without modification. Neither Pacific Gas and Electric Company, Southern California Edison, Southern California Gas Company, San Diego Gas & Electric Company, Los Angeles Department of Water and Power, Sacramento Municipal Utility District, or any of its employees makes any warranty, express of implied; or assumes any legal liability or responsibility for the accuracy, completeness or usefulness of any data, information, method, product, policy or process disclosed in this document; or represents that its use will not infringe any privately-owned rights including, but not limited to, patents, trademarks or copyrights. Document Information Category: Codes and Standards Keywords: Statewide CASE, Statewide Codes and Standards Team, Statewide C&S Team, Codes and Standards Enhancements, Title 24, 2019, efficiency, indoor air quality, ventilation rates, air filtration Authors: David Springer (Davis Energy Group) and Marian Goebes (TRC) Project Management: California Utilities Statewide Codes and Standards Team: Pacific Gas and Electric Company (PG&E), Southern California Edison (SCE), SoCalGas®, San Diego Gas & Electric Company (SDG&E), Los Angeles Department of Water and Power (LADWP), and Sacramento Municipal Utility District (SMUD) 2019 Title 24, Part 6 CASE Report – 2019-RES-IAQ2-D Page i Table of Contents Executive Summary ................................................................................................................... iv 1. Introduction ...........................................................................................................................1 2. Measure Description .............................................................................................................2 2.1 Measure Overview ...................................................................................................................... 2 2.2 Measure History ....................................................................................................................... 10 2.3 Summary of Proposed Changes to Code Documents ............................................................... 12 2.4 Regulatory Context ................................................................................................................... 15 2.5 Compliance and Enforcement ................................................................................................... 16 3. Market Analysis ...................................................................................................................17 3.1 Market Structure ....................................................................................................................... 17 3.2 Technical Feasibility, Market Availability and Current Practices ............................................ 18 3.3 Market Impacts and Economic Assessments ............................................................................ 22 3.4 Economic Impacts .................................................................................................................... 25 4. Energy Savings .....................................................................................................................28 4.1 Key Assumptions for Energy Savings Analysis ....................................................................... 28 4.2 Energy Savings Methodology ................................................................................................... 29 4.3 Per Unit Energy Impact Results ............................................................................................... 30 5. Lifecycle Cost and Cost-Effectiveness ...............................................................................32 5.1 Energy Cost Savings Results .................................................................................................... 32 5.2 Incremental First Cost............................................................................................................... 32 5.3 Lifetime Incremental Maintenance Costs ................................................................................. 35 5.4 Lifecycle Cost-Effectiveness .................................................................................................... 35 6. First-Year Statewide Impacts .............................................................................................35 6.1 Statewide Energy Savings and Lifecycle Energy Cost Savings ............................................... 35 6.2 Statewide Water Use Impacts ................................................................................................... 35 6.3 Statewide Material Impacts ...................................................................................................... 35 6.4 Other Non-Energy Impacts ....................................................................................................... 36 7. Proposed Revisions to Code Language ..............................................................................36 7.1 Standards .................................................................................................................................. 36 7.2 Reference Appendices .............................................................................................................. 39 7.3 ACM Reference Manual ........................................................................................................... 41 7.4 Compliance Manuals ................................................................................................................ 42 7.5 Compliance Documents ............................................................................................................ 42 8. References ............................................................................................................................42 Appendix A : Statewide Savings Methodology .......................................................................46 Appendix B : Supporting Information for Multifamily Ventilation Measures ...................49 Appendix C : Discussion of Impacts of Compliance Process on Market Actors .................56 2019 Title 24, Part 6 CASE Report – 2019-RES-IAQ2-D Page ii List of Tables Table 1: Scope of Code Change Proposal ..................................................................................................... v Table 2: Current and Proposed Ventilation Rates for Example HRMF Units .............................................. 4 Table 3: Comparison of HRMF Ventilation Strategies ................................................................................. 6 Table 4: HRV and ERV Product Cost, Flowrates, and MERV Ratings ..................................................... 20 Table 5: Filtration Requirements in Building Standards, Above Code Programs, and City Ordinances ... 21 Table 6: Industries Receiving Energy Efficiency Related Investment, by North American Industry Classification System (NAICS) code .................................................................................................. 27 Table 7: Prototype Buildings used for Energy, Demand, Cost, and Environmental Impacts Analysis ...... 30 Table 8: First-Year Energy Impacts for Blended Single Family Prototype ................................................ 31 Table 9: First-Year Energy Impacts of Ventilation Rate Change for High-Rise Residential Unit Prototypes (Averaged) ........................................................................................................................................... 32 Table 10: Summary of Incremental Costs ................................................................................................... 34 Table 11: Incremental Costs for Proposed Measures for Each New Construction Prototype .................... 35 Table 12: Projected New Residential Construction Completed in 2020 by Climate Zone1 ........................ 47 Table 13: Translation from Forecast Climate Zone (FCZ) to Building Standards Climate Zone (BCZ) ... 48 Table 14: PM 2.5 Standards Attainment Status for California Regions ..................................................... 51 Table 15: Description of Ventilation Rates in Past, Current, and Proposed Standards for High-Rise Multifamily Units ................................................................................................................................ 53 Table 16: Ventilation Rates under Different Standards for Example HRMF Unit Configurations (cfm) .. 53 Table 17: Example Compartmentalization Checklist ................................................................................. 55 Table 18: Roles of Market Actors in the Proposed Compliance Process.................................................... 58 List of Figures Figure 1: Change in mechanical ventilation
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