ASHRAE-90.1-2022- - Page 305
Extracted Content
simulation program shall include calculation methodologies for the building components being modeled. For components that cannot be modeled by the simulation program, the exceptional calculation methods requirements in Section G2.5 shall be used.
Informative Note: For the ease of use and consistent application, the simulation program should automatically implement the requirements of this appendix to generate the baseline design and proposed design models based on the user model of the proposed design .
G2.2.1 The simulation program shall be approved by the rating authority and shall, at a minimum, have the ability to explicitly model all of the following:
a. 8760 hours per year b. Hourly variations in occupancy, lighting power, miscellaneous equipment power, thermostat set points,
humidity set points, and HVAC system operation, defined separately for each day of the week and holidays c. Thermal mass effects d. Ten or more thermal zones e. Part-load performance curves for mechanical equipment f. Capacity and efficiency correction curves for mechanical heating and mechanical cooling equipment g. Air economizers with integrated control h. Baseline building design characteristics specified in Section G3
G2.2.2 The simulation program shall have the ability to either directly determine the proposed building performance and baseline building performance or produce hourly reports of energy use by an energy source suitable for determining the proposed building performance and baseline building performance using a separate calculation.
G2.2.3 The simulation program shall be capable of performing design load calculations to determine required HVAC equipment capacities and air and water flow rates in accordance with Section 6.4.2.1 for both the proposed design and baseline building design .
G2.2.4 Simulation Program Testing Requirements
G2.2.4.1 The simulation program shall be tested according to ASHRAE Standard 140, except for Sections 7 and 8 of Standard 140. The required tests shall include building thermal envelope and fabric load tests (Sections 5.2.1, 5.2.2, and 5.2.3), ground coupled slab-on- grade analytical verification tests (Section 5.2.4), space -cooling equipment performance tests (Section 5.3), space -heating equipment performance tests (Section 5.4), and air-side HVAC equipment analytical verification tests (Section 5.5), along with the associated reporting (Section 6).
G2.2.4.2 The test results and modeler reports shall be posted on a publicly available website and shall include the test results of the simulation program and input files used for generating the results along with the results of the other simulation programs included in ASHRAE Standard 140, Annexes B8 and B16. The modeler report in Standard 140, Annex A2, Attachment A2.7 shall be completed for results exceeding the maximum or falling below the minimum of the reference values and for omitted results.
G2.2.4.3 The testing shall be performed for the version of the simulation program used to calculate the proposed building performance and baseline building performance .
Informative Notes:
- There are no pass/fail criteria established by this requirement.
- Based on the Section 3 definition, simulation program includes the simulation engine and the corresponding user interface. The testing of a simulation program only meets the requirements of Section G2.2.4 for that simulation program and cannot be used as proxy for documenting compliance of another simulation program that uses the same simulation engine .
G2.3 Climatic Data. The simulation program shall perform the simulation using hourly values of climatic data, including temperature, humidity, solar radiation, and wind speed and direction from representative climatic data, for the site in which the proposed design is to be located. For locations for which several climatic data sources are available or weather data are not available, the designer shall select available weather data that best represent the climate at the construction site . The selected weather data shall be approved by the rating authority .
G2.4 Renewable, Recovered, and Purchased Energy
G2.4.1 On-Site Renewable Energy and Site-Recovered Energy. Site-recovered energy shall not be considered purchased energy and shall be subtracted from the proposed design energy consumption prior to calculating the proposed building performance . On-site renewable energy shall be subtracted from the proposed
ANSI/ASHRAE/IES Standard 90.1-2022 (I-P) 303