ASHRAE-90.1-2022- - Page 361
Extracted Content
performance, the proposed building performance, Performance Cost Site Energy Index (PCI), and Performance Cost Site Energy Index Target (PCI_t).
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p. For any exceptional calculation methods employed, document the predicted energy savings by energy type, the site energy cost savings, a narrative explaining the exceptional calculation method performed, and theoretical or empirical information supporting the accuracy of the method.
Modify Section G2.4.2 as follows:
G2.4.2 Annual Energy Costs Site Energy. The design energy cost and baseline energy cost shall be determined using either actual rates for purchased energy or state average energy prices published by DOE’s Energy Information Administration (EIA) for commercial building customers, but rates from different sources may not be mixed in the same project.
G2.4.2.1 The baseline building performance and proposed building performance shall be determined using conversion factors in Table G2.1.
Table G2.1 Units of Fuel to Site Energy Conversion Factors
| Building Project Energy Source | Units | Site Energy, Btu/unit |
|---|---|---|
| Electricity | kWh | 3412 |
| Natural gas | therm | 100,000 |
| Propane | therm | 100,000 |
| Distillate fuel oil | gal | 137,600 |
G2.4.2.2 Where on-site renewable energy or site-recovered energy is used, the baseline building design shall be based on the energy source used as the backup energy source, or the baseline system energy source in that category if no backup energy source has been specified, except where the baseline energy source is prescribed in Table G3.1.1-2 and G3.1.1-3. Where the proposed design includes on-site electricity generation systems other than on-site renewable energy systems, the baseline design shall include the same generation systems excluding its site-recovered energy.
Informative Note: The above provision allows users to gain credit for features that yield load management benefits. Where such features are not present, users can simply use state average unit prices from EIA, which are updated annually and readily available on EIA’s web site (http://www.eia.gov).
Modify Section G2.5(e) as follows:
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e. The Performance Cost Index calculated with and without the exceptional calculation method.
ANSI/ASHRAE/IES Standard 90.1-2022 (I-P) 359
