855773644-LEED-v5-BD-C-Reference-Guide-Launch-Edition - Page 199
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The materials of construction for the water system that come into contact with the cooling tower water shall be of the type that can operate and be maintained within the cycles established in Table 19. Points are awarded according to Table 19.
Table 19. Points for cooling tower cycles
| Cooling tower cycles | Points |
|---|---|
| Maximum number of cycles achieved without exceeding any maximum concentration levels or affecting operation of condenser water system. | 1 |
| Meet the maximum calculated number of cycles to earn 1 point and increase the number of cycles by a minimum of 25% by increasing the level of treatment and/or maintenance in condenser or makeup water systems. OR Meet the maximum calculated number of cycles to earn 1 point and use a minimum 20% alternative water. | 2 |
| Meet the maximum calculated number of cycles to earn 1 point and increase the number of cycles by a minimum of 30% by increasing the level of treatment and/or maintenance in condenser or makeup water systems. OR Meet the maximum calculated number of cycles to earn 1 point and use a minimum 30% alternative water. | 3 |
Projects whose cooling is provided by district cooling systems are eligible to achieve Path 1 if the district cooling system complies with the above requirements.
OR
PATH 2. OPTIMIZE WATER USE FOR COOLING (1–3 POINTS)
To be eligible for Path 2, the baseline system designated for the building using ASHRAE 90.1– 2019 or 90.1–2022, Appendix G, Table G3.1.1–3, must include a cooling tower (systems 7, 8, 11, 12, and 13).
Achieve increasing levels of cooling tower water efficiency beyond a water-cooled chiller system with axial variable-speed fan cooling towers having a maximum drift of 0.002% of recirculated water volume and three cooling tower cycles. Points are awarded according to Table 20.
Table 20. Points for reducing annual water use compared to water-cooled chiller system
| Percentage reduction | Points |
|---|---|
| 25% | 1 |
| 50% | 2 |
U.S. Green Building Council LEED v5 Reference Guide for Building Design and Construction, April 2025 Launch Edition 189