• NORMATIVE APPENDIXC
    PERFORMANCE OPTION FOR ENERGY EFFICIENCY

    (This is a normative appendix and is part of this code.)

    SECTIONC101 (C1.)
    GENERAL

    C101.1 (C1.1)Renewable, Recovered, and Purchased Energy.

    On-site renewable energy systems and site recovered energy: The modeling requirements for on-site renewable energy systems in the proposed building performance in ANSI/ASHRAE/IES Standard 90.1, Section G2.4.1, shall not apply and are superseded by Table C101.1 (C1.1), Section 15, “Renewable Energy Systems.”

    TABLE C101.1 (TABLE C1.1)

    MODIFICATIONS AND ADDITIONS TO ANSI/ASHRAE/IES STANDARD 90.1, Appendix G, TABLE G3.1

    PROPOSED BUILDING PERFORMANCEBASELINE BUILDING PERFORMANCE
    1. Design ModelNo modificationsNo modifications
    2. Additions and AlterationsNo modificationsNo modifications
    3. Space Use ClassificationNo modificationsNo modifications
    4. SchedulesNo modificationsNo modifications
    5. Building EnvelopeNo modificationsNo modifications
    6. LightingNo modificationsNo modifications
    7. Thermal Blocks—HVAC Zones DesignedNo modificationsNo modifications
    8. Thermal Blocks—HVAC Zones Not DesignedNo modificationsNo modifications
    9. Thermal Blocks—Multifamily Residential BuildingsNo modificationsNo modifications
    10. HVAC SystemsNo modificationsNo modifications
    11. Service Hot-Water SystemsNo modificationsNo modifications
    12. Receptacle and Other LoadsNo modificationsNo modifications
    13. Modeling Limitations to the Simulation ProgramNo modificationsNo modifications
    14. Exterior ConditionsNo modificationsNo modifications
    15. On-Site Renewable Energy Systems

    The reduction in the proposed building performance and annual CO2e of the proposed design due to energy generated by on-site renewable energy systems shall be calculated as follows:
    1. a.Annual Energy Cost. The annual energy cost of the proposed design with an on-site renewable energy system shall be calculated on an hourly basis and adjusted as follows:
      1. 1.Thermal Energy Performance Calculation. The hourly thermal loads of the proposed design shall be reduced by the hourly thermal energy production of the on-site renewable energy system (but thermal loads shall not be reduced to less than zero). When the on-site renewable thermal energy production exceeds the applicable thermal demands of the building for any hour, the excess generated energy may be used to displace thermal loads at other times, provided the system has the storage capability and storage losses are included in the calculation. The approved energy rate structure shall be applied to the reduced energy consumption.
      2. 2.Electric Energy Performance Calculation. The total electrical energy production of the on-site renewable energy system shall be calculated on an hourly basis, and the energy cost of the proposed building performance shall be calculated by applying the approved electrical rate structure to each hour’s electrical usage, including any reduction from hourly electrical energy production of the on-site renewable energy system.
      Exception: For building projects with no net metering agreement, feed-in tariff, or other electrical rate structure for net generated electricity, the cost of imported electricity from the grid is calculated by applying the approved electrical rate structure to each hour’s electrical loads minus the hourly electrical energy production of the on-site renewable energy system, but the cost of imported electricity shall not be less than zero on a monthly basis.

      Electricity production of the on-site renewable energy system that has a retail value in excess of the retail cost of electricity consumption on a monthly basis shall be credited as a reduction in energy costs to the building performance at the wholesale rate as follows:
      where:
      Credit = cost reduction credit for month where retail value of exported electricity is greater than retail value of imported electricity. ExRR = month’s value of exported electricity at retail rate. ImRR = month’s value of imported electricity at retail rate. ExkWh = total kilowatt-hours exported in month. WR = average monthly wholesale rate for the region where the building located.
    2. b.Annual CO2e. The annual CO2e of the proposed building that includes an on-site renewable energy system shall be equal to the annual CO2e of the imported energy to serve the proposed building (with reduced loads due to the on-site renewable energy system) minus the annual exported electricity produced by the on-site renewable energy system multiplied by the electrical CO2e emission factor.
    Documentation: The documentation required in ANSI/ASHRAE/IES Standard 90.1, Section G2.5 (a), (b), and (e), shall be made available to the AHJ, upon request, for all on-site renewable energy systems in the proposed design.

    C101.2 (C1.2)Building Performance Calculations.

    In addition to the requirements of ANSI/ASHRAE/IES Standard 90.1, Table G3.1, the proposed design shall comply with all modifications and additions in Table C101.1 (C1.1). All references to Table G3.1 in Table C101.1 (C1.1) refer to ANSI/ASHRAE/IES Standard 90.1, Appendix G, Table G3.1.

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