ASHRAE-90.1-2022- - Page 210

Extracted Content

12. ENERGY COST BUDGET METHOD

12.1 General

12.1.1 Energy Cost Budget Method Scope. The building Energy Cost Budget Method is an alternative to the prescriptive provisions of this standard. It may be employed for evaluating the compliance of all pro- posed designs except designs with no mechanical system .

12.1.2 Trade-Offs Limited to Building Permit. When the building permit being sought applies to less than the whole building, only the calculation parameters related to the systems to which the permit applies shall be allowed to vary. Parameters relating to unmodified existing conditions or to future building components shall be identical for both the energy cost budget and the design energy cost calculations. Future build- ing components shall meet the prescriptive requirements of Sections 5.5, 6.5, 7.5, and 9.5.

b. The design energy cost shall comply with the following:

Design Energy Cost  Energy Cost Budget   1 - EC------------1000 req -  Aadj 

where

EC req = energy credits required for the building in accordance with Section 11.5.1

Aadj = where the project includes additions or alterations use an adjustment factor as follows; otherwise use 1.0:

DESIGN SUBMITTED FIRST FOR APPROVAL FROM AHJ… THEN SUBMIT ENERGY COST BUDGET METHOD RESULTS TO AHJ.

Aadj

Addition Gross Floor Area + Alteration Gross Floor Area = ------------------------------------------------------------------------------------------------------------------------------------------Modeled gross floor area

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