ASHRAE-90.1-2022- - Page 303

Extracted Content

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

NORMATIVE APPENDIX G PERFORMANCE RATING METHOD

G1. GENERAL

G1.1 Performance Rating Method Scope. This appendix offers an alternative path for minimum standard compliance in accordance with Section 4.2.1.1 when administered by a building official . It is also provided for those who wish to use this appendix to quantify performance that exceeds the requirements of this standard when administered by a rating authority and not seeking minimum standard compliance in accordance with Section 4.2.1.1. It shall be used for evaluating the performance of all such proposed designs, including alterations and additions to existing buildings, except designs with no mechanical systems . In the case where this appendix is administered solely by a building official to determine compliance with this standard in accordance with Section 4.2.1.1, all references to “ rating authority ” shall be replaced with “ building official. ”

G1.2 Performance Rating

G1.2.1 Mandatory Provisions. The proposed building design shall comply with all of the following:

a. Sections 5.2.1, 6.2.1, 7.2.1, 8.2.1, 9.2.1, and 10.2.1. b. Interior lighting power shall not exceed the interior lighting power allowance determined using either

1. Tables G3.7-1 and G3.7-2 and the methodology described in Section 9.5.2, or
2. Table G3.8 and the methodology described in Section 9.5.1. c. Energy efficiency levels of installed components and systems shall meet or exceed the efficiency levels

used to calculate the proposed building performance . d. For new buildings, one of the following shall be met:

1. The building envelope complies with Section 5.5, “Prescriptive Building Envelope Compliance Path.”
2. Using Section 5.6, “Building Envelope Trade-Off Compliance Path,” the proposed envelope perfor- mance factor shall not exceed the base envelope performance factor by more than 15% in multifamily residential, hotel/motel, and dormitory building area types. For all other building area types, the limit shall be 7%. For buildings with both residential and nonresidential occupancies, the limit shall be based on the area-weighted average of the gross conditioned floor area . e. Verification, testing, and commissioning requirements of Section 4.2.5 shall be met. f. Proposed building systems, controls, or building envelope documented in Section G1.3(c) that do not have criteria in Sections 5 through 10 shall have verification or testing to document proper installation and operation in accordance with Section 4.2.5.

G1.2.2 Performance Rating Calculation. The performance of the proposed design is calculated in accordance with provisions of this appendix using the following formula:

Performance Cost Index = Proposed building performance / Baseline building performance Both the proposed building performance and the baseline building performance shall include all end-use load components within and associated with the property when calculating the Performance Cost Index.

Exception to G1.2.2: Energy used to recharge or refuel vehicles that are used for off- site transportation pur poses shall not be modeled in the baseline building performance or the proposed building performance .

Informative Notes:

1. Neither the proposed building performance nor the baseline building performance are predictions of actual energy consumption or costs for the proposed design after construction . Actual experience will differ from these calculations due to variations such as occupancy, building operation and maintenance, weather, energy use not covered by this procedure, changes in energy rates between design of the building and occupancy, and the precision of the calculation tool.
2. See Informative Appendix I for using other metrics, including site energy, source energy, and carbon emissions, in conjunction with the Normative Appendix G Performance Rating Method when approved by the rating authority .

G1.3 Submittals

G1.3.1 General. Compliance documentation and supplemental information shall be submitted in accordance with Section 4.2.2 of this standard.

ANSI/ASHRAE/IES Standard 90.1-2022 (I-P) 301