ASHRAE-90.1-2022- - Page 285

Extracted Content

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

NORMATIVE APPENDIX C METHODOLOGY FOR BUILDING ENVELOPE TRADE-OFF OPTION IN SECTION 5.6

C1. MINIMUM INFORMATION

The following minimum information shall be specified for the proposed design .

C1.1 At the Building Level. The floor area, broken down by space conditioning categories and building area type, shall be specified. Each building area type shall be chosen from Table 9.5.1.

C1.2 At the Exterior and Semiexterior Surface Level. The building envelope assembly type, gross area, orientation, tilt, and associated space conditioning category and building area type shall be specified. The surface shall be designated as exterior or semiexterior. A semiexterior surface separating a conditioned space from a semiheated space shall be specified with two associated space conditioning categories . A semiexterior surface separating a conditioned space from an unconditioned space shall be specified with an associated space conditioning category and with an adjacency to an unconditioned space . Exterior surfaces with the same building envelope assembly type and associated space conditioning category and building area type whose orientations differ by no more than 22.5 degrees and whose tilts differ by no more than 22.5 degrees are allowed to be described as a single surface.

C1.2.1 For Roofs. The class of construction, opaque area, U-factor, HC, and insulation position shall be specified. Where three-year-aged test data for the solar reflectance and three-year-aged thermal emittance of the exterior roof surface are available, the three-year-aged solar reflectance and three-year-aged thermal emittance shall be specified.

C1.2.2 For Above-Grade Walls. The class of construction, opaque area, U-factor, HC, and insulation position shall be specified.

C1.2.3 For Below-Grade Walls. The opaque area, average depth to the bottom of the wall, C-factor, HC, and insulation position shall be specified.

C1.2.4 For Floors. The class of construction, opaque area, U-factor, HC, and insulation position shall be specified.

C1.2.5 For Slab-on-Grade Floors. The class of construction, perimeter length, F-factor, and HC shall be specified.

C1.2.6 For Uninsulated Assemblies. All uninsulated assemblies (e.g., projecting balconies, perimeter edges of intermediate floor slabs, concrete floor beams over parking garages, roof parapet) shall be separately modeled.

C1.2.7 For Thermal Bridges Identified in Section 5.5.5. Thermal bridge inputs and specifications shall be individually identified for the thermal bridges indicated in Section 5.5.5 according to one of the following:

a. Where the thermal bridge complies with one of the requirements of Sections 5.5.5.1 through 5.5.5.5, no

additional inputs shall be required. b. Where the thermal bridge does not comply with one or more of the requirements of Sections 5.5.5.1

through 5.5.5.5, the linear thermal bridge type or point thermal bridge type, length or count, the assembly interrupted by this thermal bridge, and the psi-factor or chi-factor shall be specified. The input shall be a user-defined value or one of the unmitigated values from Table A10.1. c. Where Section 5.5.5 and Sections 5.5.5.1 through 5.5.5.5, including exceptions, are not applicable to the

thermal bridge, no additional inputs shall be required.

C1.3 For Opaque Doors. The class of construction, area, and U-factor shall be specified. Each opaque door shall be associated with a surface as described in Section C1.2 and shall have the orientation of that surface.

C1.4 For Fenestration. The class of construction, area, assembly U-factor, assembly SHGC, VT, and PF shall be specified for fenestration . Each fenestration element shall be associated with a surface as defined in Section C1.2 and shall have the orientation of that surface.

C1.5 For Continuous Air Barriers. The method of compliance used for continuous air barriers, either whole- building pressurization testing or verification, shall be specified.

C2. OUTPUT REQUIREMENTS

Output reports shall contain the following information.

C2.1 Name and contact information of the entity executing the simulation, and date of report.

C2.2 Location of the building, including street address and climate zone.

ANSI/ASHRAE/IES Standard 90.1-2022 (I-P) 283