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Cooling Tower Minimum Efficiency

Nonresidential HVAC

Codes and Standards Enhancement (CASE) Report

The Statewide CASE Team 2019 Title 24, Part 6 Final CASE Report is available below. The Final CASE Report incorporates feedback received during utility-sponsored stakeholder meetings, Energy Commission Pre-Rulemaking workshops, and personal communication with stakeholders. We encourage stakeholders to email feedback on the Final CASE Report to You can also participate in the 2019 Title 24, Part 6 Standards updated by attending the Energy Commission workshops and submitting written comments to the rulemaking docket. Refer to the Pre-Rulemaking and Rulemaking Workshop Notices for instructions on how to submit comments to the Energy Commission’s docket (available here).

Final CASE Report: Nonresidential Cooling Tower Efficiency

Draft CASE Report: Nonresidential Cooling Tower Efficiency

Measure Description

The CASE Report proposes a prescriptive requirement for higher efficiency axial fan open-circuit cooling towers for newly constructed projects, new systems that serve additions, and non-building mounted replacements/alterations. The current 2016 Title 24, Part 6 Standards’ mandatory minimum efficiency for axial fan open-circuit cooling towers is 42.1 gallons per minute of condenser water flow per fan horsepower (gpm/hp). The 2016 Alternate Calculation Method Reference Manual assumes an efficiency of 60 gpm/hp for a standard design cooling tower. The intent of this proposal is to add a prescriptive efficiency requirement of 80 gpm/hp in addition to the mandatory requirement and to increase the standard design listed in the Alternative Calculation Method (ACM) Reference Manual to 80 gpm/hp. The measure proposes this prescriptive requirement only for condenser water systems that are rated for 900 gpm (300 tons) or greater.

    California Statewide Utility Codes and Standards Program

    This program is funded by California utility customers and administered by Pacific Gas and Electric Company, Southern California Edison, San Diego Gas and Electric Company, Southern California Gas Company, Sacramento Municipal District, and Los Angeles Department of Water and Power in preparation for the California Energy Commission’s Codes and Standards Buildings Advocacy.