CODES AND STANDARDS ENHANCEMENT INITIATIVE (CASE)
Solar Water Heating Residential and Specialty Commercial 2013 California Building Energy Efficiency Standards California Utilities Statewide Codes and Standards Team October 2011
This report was prepared by the California Statewide Utility Codes and Standards Program and funded by the California utility customers under the auspices of the California Public Utilities Commission.
Copyright 2011 Pacific Gas and Electric Company, Southern California Edison, SoCalGas, SDG&E.
All rights reserved, except that this document may be used, copied, and distributed without modification.
Neither PG&E, SCE, SoCalGas, SDG&E, nor 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
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Table of Contents
1. Introduction .................................................................................................................. 12. Overview ....................................................................................................................... 2
2.1 Measure Title ............................................................................................................................. 2Solar Water Heating Residential and Specialty Commercial ........................................................ 2
2.2 Description ................................................................................................................................. 22.3 Type of Change ......................................................................................................................... 32.4 Energy Benefits ......................................................................................................................... 32.5 Non-Energy Benefits ................................................................................................................. 52.6 Environmental Impact ............................................................................................................... 52.7 Technology Measures ................................................................................................................ 72.8 Performance Verification of the Proposed Measure .................................................................. 72.9 Cost Effectiveness ..................................................................................................................... 82.10 Analysis Tools ........................................................................................................................ 92.11 Relationship to Other Measures ............................................................................................. 9
3. Methodology ............................................................................................................... 103.1 Single Family Residential Buildings ....................................................................................... 10
3.1.1 Base Case System Selection: ............................................................................................ 103.1.2 Proposed Standards Case System Selection: .................................................................... 103.1.3 Calculation of Costs: ......................................................................................................... 10
3.2 Non-Residential Buildings ...................................................................................................... 133.2.1 Base Case System Selection: ............................................................................................ 133.2.2 Proposed Standards Case System Selection: .................................................................... 133.2.3 Calculation of Costs: ......................................................................................................... 143.2.4 Statewide Energy Savings ................................................................................................. 18
4. Analysis and Results ................................................................................................. 194.1 Statewide Energy Savings ....................................................................................................... 21
5. Recommended Language for the Standards Document, ACM Manuals, and the Reference Appendices ....................................................................................................... 23
5.1 Title 24, Part 6 ......................................................................................................................... 235.2 Title 24 Part 6 & Part 11 .......................................................................................................... 295.3 Compliance Forms ................................................................................................................... 305.4 Residential and Nonresidential ACM Manual ......................................................................... 31
6. Bibliography and Other Research ............................................................................ 327. Appendices ................................................................................................................. 34
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7.1 Appendix A: TDV Part 11 of Title 24 (Reach Code) Multipliers ........................................... 347.2 Appendix B: Population Weighting for Plumbing Labor and Materials ................................. 357.3 Appendix C: Cost Data ............................................................................................................ 377.4 Appendix E: ACM formula for Standard Recovery Load Btu/h/sq. ft. ................................... 407.5 Appendix F: Installation Cost Data ......................................................................................... 417.6 Appendix G: Commercial Building Energy Consumption Survey Data ................................. 427.7 Appendix H: Non-Residential Construction Forecast Details ................................................. 44
7.7.1 Summary ........................................................................................................................... 447.7.2 Additional Details ............................................................................................................. 447.7.3 Citation .............................................................................................................................. 45
7.8 Appendix I: Residential Construction Forecast Details .......................................................... 457.8.1 Summary ........................................................................................................................... 457.8.2 Additional Details ............................................................................................................. 467.8.3 Citation .............................................................................................................................. 47
List of Tables and Figures
Table 1: Maintenance and Replacement Costs: Base Case System ..................................................... 11
Table 2: Maintenance and Replacement Costs: Standards Case System ............................................. 12
Table 3: Maintenance and Replacement Costs: Base Case System Commercial Electric Storage ...... 16
Table 4: Maintenance and Replacement Costs: Proposed Standards System Commercial Solar System w/ Electric Storage Back up ................................................................................................... 16
Table 5: Maintenance and Replacement Costs: Base Case System Commercial Natural Gas Storage 17
Table 6 :Maintenance and Replacement Costs: Proposed Standards System Commercial Natural Gas Storage ................................................................................................................................... 17
Table 7: Prototype Size ........................................................................................................................ 17
Table 8: ORIGINAL Proposed Standards Case Results: Residential Solar w/ Electric back up ......... 19
Table 9: AMENDED Proposed Standards Case Results: Residential Solar w/ Electric Resistance back up ............................................................................................................................................ 20
Table 10: Proposed Standards Case Results: Restaurant above 12,600 sq. ft. (BASE TDV) .............. 21
Table 11: Proposed Standards Case Results: Restaurant above 1,600 sq. ft. w/ Electric back up (REACH TDV) ...................................................................................................................... 21
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1. Introduction Through Codes and Standards Enhancement (CASE) Studies, the California Investor Owned Utilities (IOUs) provide standards and code-setting bodies with the technical and cost-effectiveness information required to make informed judgments o
