ASHRAE-90.1-2022- - Page 216

Extracted Content

IAGW = adjusted air leakage rate of the building envelope cfm/ft [2] at a reference wind speed of 10 mph and relative to the area of the above-grade walls of the building envelope AAGW = total area of above-grade walls of the building envelope, ft [2]

Exception to 12.5.3: A multizone airflow model alternative method to modeling building envelope air

leakage may be used, provided the following criteria are met:

1. Where the calculations are made independently of the energy simulation program, the proposed method must comply with Section 12.4.5.
2. The method for converting the air leakage rate of the building envelope at 75 Pa (0.30 in. of water) to the appropriate units for the simulation program is fully documented and submitted to the rating authority for approval.

12.6 Alternative Compliance Path (Not Used)

12.7 Submittals 12.7.1 General. Compliance documentation and supplemental information shall be submitted in accordance with Section 4.2.2 of this standard.

12.7.2 Permit Application Documentation. Compliance shall be documented and submitted to the building official . The information submitted shall include the following:

a. The energy cost budget for the budget building design and the design energy cost for the proposed design . b. The simulation program used and the version of the simulation program . c. An overview of the project that includes the number of stories (above and below grade ), the typical floor

size, the uses in the building (e.g., office, cafeteria, retail, parking, etc.), the gross area of each use, and whether each use is conditioned . d. A list of the energy -related features that are included in the design and on which compliance with the

provisions of Section 12 is based. This list shall document all energy features that differ between the models used in the energy cost budget and the design energy cost calculations. e. A list showing compliance for the proposed design with all the requirements of Sections 5.4, 6.4, 7.4,

8.4, 9.4, and 10.4 (mandatory provisions). f. Building elevations and floor plans. g. A diagram showing the thermal blocks used in the computer simulation. h. An explanation of any significant modeling assumptions. i. Backup calculations and material to support data inputs (e.g., U-factors for building envelope assemblies, NFRC ratings for fenestration, end uses identified in Table 12.5.1(1)(a). j. Reports from the simulation program showing

1. a breakdown of energy usage by at least the following components: lights, internal equipment loads, service water-heating equipment, space -heating equipment, space cooling and heat-rejection equip- ment, fans, and other HVAC equipment (such as pumps );
2. the amount of time any loads are not met by the HVAC system for both the proposed design and bud- get building design ; and
3. a description of energy -related features of the budget building design and the proposed design to support requirements of Section 12.7.2(d). k. Purchased energy rates used in the simulations. l. An explanation of any error messages noted in the simulation program output. m. For any exceptional calculation methods employed, document the predicted energy savings by energy

type, the energy cost savings, a narrative explaining the exceptional calculation method performed, and theoretical or empirical information supporting the accuracy of the method. n. The reduction in design energy cost associated with on-site renewable energy . o. The version of the software and the link to the website that contains the ASHRAE Standard 140 results

for the version used in accordance with Section 12.4.1.4. p. Simulation input files for the budget building design and the proposed design shall be made available if

requested by the building official.

12.7.3 Completion Requirements. Completion requirements shall be in compliance with Sections 5.7.3, 6.7.3, 7.7.3, 8.7.3, 9.7.3, and 10.7.3.

12.8 Product Information (Not Used)

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