855773644-LEED-v5-BD-C-Reference-Guide-Launch-Edition - Page 226

Extracted Content

ASHRAE 90.4 for spaces matching the ASHRAE 90.1 definition of computer room such as data centers or server rooms:

• Section 6.6.1 Computer Room System Path

• Section 8.6.1 Computer Room Systems

OPTION 2. PRESCRIPTIVE METHOD, ASHRAE 90.1-2022, SECTION 11. ADDITIONAL EFFICIENCY REQUIREMENTS

For the ASHRAE 90.1-2022 prescriptive method, designers must also select from a list of additional efficiency measures in Section 11, Additional Efficiency Requirements to earn the minimum number of Energy Credits required for the project’s building type and climate zone per Table 11.5.1-1. This gives the project team more flexibility to select the additional measures that are most feasible and appropriate for their project application.

Each of the efficiency measures referenced in Section 11 is awarded a specific number of base Energy Credits per building type and climate, equating to approximately 0.1% savings per credit (See ASHRAE 90.1-22, Tables 11.5.3-1 through 11.5.3-9). Section 11.5.2 outlines opportunities for further adjustments to augment these base credits for certain efficiency measures.

For example, an office project in climate zone 4A earns eight base credits for achieving a 5% reduction in lighting power (L06), but this increases to 16 credits for a 10% reduction based on the adjustment described in the detailed summary of this measure.

Combined credits for renewable and load management measures are limited to 60% of the total required energy credits per ASHRAE 90.1-2022, Section 11.5.2 .

ASHRAE 90.1-2022, Addendum j allows projects to use the Total System Performance Ratio (TSPR) to demonstrate overall improvement in HVAC performance rather than applying individual system efficiency measures.

U.S. Green Building Council LEED v5 Reference Guide for Building Design and Construction, April 2025 Launch Edition 216