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EFTA00281516 | EFTA00281711 EA CI Credit 13 STEP 6A. Model an Alternative Baseline Case In the above method, the differential between the DEC and energy cost budget increases as the energy efficiency of the building decreases. This could make it easier to reach the credit thresholds in a less efficient building. So as not to penalize project teams that have wisely located in a highly energy-efficient building—perhaps a building already LEED certified—an alternative baseline method is provided. If the existing conditions are more energy efficient than the prescriptive requirements of ASHRAE 90.1-2007, replace the existing conditions in the baseline model with the ASH RAE 90.1-2007 requirements. Basethe credit calculations oneither baseline. Document the choice in the narrative included with the submittal; if results for both baselines were generated, consider submitting both. STEP 7. Calculate the Energy Reduction Because of the 2 possible baseline cases, there are 2 energy reduction calculations. The reduction for the model baseline case uses ASHRAE 90.1-2007 mandatory and prescriptive requirements in the project area and edstingconditions in the balance of the modeled building segment, as shown in Equation 1. It corrects for the area relationship between the project space and the modeled buildingsegment. The reduction for the alternative baseline, potentially more generous if the building is highly efficient, is shown in Equation 2. No adjustment is made for the project-to-buildingsegment area because the calculation evaluates the overall performance of the HVAC system. Equation 1. Percent Annual HVAC Energy Cost Reduction Baseline: Project Area - ANSI/ AHRAE/IESNA 90.t mandatory and prescriptive requirements Balance of modeled Building Segment - Existing Conditions ECBmt — DECK& Reduction = EC8 NyAC X Project Area Total Segment Area Equation 2. Percent Annual HVAC Energy Cost Reduction Alternate Baseline: Both Project Area and Balance of Modeled Building Segment - ANSI/ AHRAE/IESNA 90.1 mandatory and prescriptive requirements A-ECB„wc — DEC„µ.,c Reduction — A-ECB,„„c 7. Documentation Guidance As a first step in preparing to complete the LEED-Online documentation requirements, work through the following measures. Refer to LEED-Online for the complete descriptions of all required documentation. ■ List locations and functions of HVAC system automatic controls or sensors. ■ Document potential energy savings per control and reasons for zone distribution. ■ For cost-budget compliance, list the proposed design energy by end use, associated peak demand, and cost. Additionally, list baseline costs by energy type. 172 LEED REFERENCE GUIDE FOR GREEN INTERIOR DESIGN AND CONSTRUCTION 2009 EDITION EFTA00281711
April 26, 2026 at 4:07 AM