ASHRAE-90.1-2022- - Page 385
Extracted Content
e. By block, the U-factor, C-factor, or F-factor for each simulated opaque building envelope component
and the U-factor and SHGC for each fenestration component f. By block or by surface for each block, the fenestration area and total area of each opaque building enve- lope component g. By block, a list of the HVAC equipment simulated in the proposed design, including the equipment type,
fuel type, rated equipment efficiencies, rated capacities, and system control parameters h. Annual site HVAC energy use by end use and energy type for the proposed design and TSPR reference
building design i. Annual sum of hourly heating and cooling loads for the TSPR reference building design j. The HVAC total system performance ratio for both the TSPR reference building design and the proposed design and compliance result in accordance with Section 6.6.2.2
Informative Note: The simulation program, at a minimum, will report compliance with the TSPR based on the compliance criteria in Section 6.6.2.2. Should a jurisdiction adopt other compliance criteria, then a separate calculation of TSPR using the reference building design and proposed design HVAC energy type input may be necessary.
L4. CALCULATION PROCEDURE
Except as specified by this appendix, the TSPR reference building design and proposed design shall be configured and analyzed using identical methods and techniques.
L4.1 Simulation of the Proposed Design (Non-HVAC). The proposed design non- HVAC systems shall be configured and analyzed as specified in this section. At a minimum, the simulation program shall support the building use types included in the analysis. The allowed building use types are listed in Section L1.1.1.1.
L4.1.1 Simplified Block Approach. The simulation program shall model the building using one or more simplified geometric simulation building blocks, described in Section L2.1. Each block contains one or multiple thermal blocks . The simulation program shall provide for simplified input described in Section L2.2 and allow for multiple block simulation.
L4.1.2 Thermal Zoning. Each story in a block shall be modeled as a single thermal block or as five ther- mal blocks consisting of four perimeter zones and a core zone. Below- grade stories shall always be modeled as a single block. If any facade in the block is less than 45 ft in length, there shall only be a single thermal block per story . Otherwise, each story shall be modeled with five thermal blocks . A perimeter zone shall be created extending from each facade to a default depth of 15 ft with a user input range of 8 to 20 ft. Where facades intersect, the zone boundary shall be formed by a 45 degree angle with the two facades. The remaining area or each story shall be modeled as a core zone with no exterior walls .
L4.1.3 Building Use Type. The building use type for each block shall be consistent with the proposed design and allowed building use types in Section L1.1.1.1. The occupant density, heat gain, and schedule shall be as specified by Normative Appendix C.
L4.1.4 Building Envelope Components. Building envelope thermal properties used in the proposed design shall be modeled based on the actual proposed design using inputs described in Section L2.2.2 and shall comply with all of the following:
a. Roofs shall be modeled with insulation above a steel roof deck. Roof solar absorptance shall be modeled
at 0.70 and thermal emittance at 0.90. b. Above-grade walls shall be modeled as steel-frame construction. c. Above- grade exterior floors shall be modeled as steel-frame construction. d. The area, U-factor, and SHGC of vertical fenestration shall be modeled for each facade based on the
actual proposed design . The simulation program shall model a combined single window centered on each facade based on the area and sill height input by the user. e. The skylight area shall be modeled for each roof based on the actual proposed design . Skylights shall be
combined into a single skylight centered on the roof of each zone based on the area input by the user.
L4.1.5 Lighting. For each block, the interior lighting power density shall be equal to the applicable allowance in Table 9.5.1 based on the assigned building use type. The lighting profile schedule shall be for the applicable building use type as specified by Normative Appendix C. The impact of lighting controls is assumed to be captured by the lighting schedule, and no explicit controls (including daylight responsive controls) shall be modeled. Exterior lighting shall not be modeled.
L4.1.6 Miscellaneous Equipment. The miscellaneous equipment schedule and power shall be based on the assigned building use type as specified by Normative Appendix C. The impact of miscellaneous equip- ment controls is assumed to be captured by the equipment schedule, and no explicit controls shall be modeled.
ANSI/ASHRAE/IES Standard 90.1-2022 (I-P) 383