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Adiabatic Condensers (refrigerated warehouses and supermarkets)

Process

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 info@title24stakeholders.com. 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).

Measure Description

The proposed measure will add adiabatic condensers to the California Building Energy Efficiency Standards. For the purposes of this code change proposal the Statewide CASE Team defines adiabatic condensers as follows:

A refrigeration system component that condenses refrigerant vapor by rejecting heat to air mechanically circulated over its heat transfer surface, causing a temperature rise in the air, with the additional capability to utilize evaporative precooling of the entering air, for operation only during high ambient temperatures, and accomplished as part of a single factory-made and rated unit.

The mandatory requirements in Section 120.6 cover air cooled and evaporative condensers. Adiabatic condensers are not currently mentioned in the code, even as an exception and therefore there is confusion in the industry.

The new mandatory code requirements will be added to Section 120.6 (a) and (b) and applies to refrigerated warehouses and commercial refrigeration, respectively.

The Statewide CASE Team discussed including adiabatic condensers for the 2013 Title 24, Part 6 code update cycle but product information was limited at that time and the Statewide CASE Team did not feel there was adequate time to address the energy savings and cost issues within the adoption schedule.
Since the development of the 2013 Title 24, Part 6 CASE Report analysis (approximately six years) market interest as greatly increased due to:

  • Large water savings compared with evaporative condensers.
  • Large kW savings and potential kWh savings compared with air-cooled condensers.

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.