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Proposal Description

This proposal outlines a recommendation for the CEC to adopt specific efficiencies for different evaporator applications, types, and refrigerants. If adopted, this measure would save 0.872 MWh of electricity in the first year and reduce peak electrical demand by 85.569 kW during the same timeframe.

The Statewide CASE Team recommended the same change for the 2022 code cycle, but the CEC did not adopt the proposed requirements for the 2022 code cycle due to resource constraints. Therefore, the Statewide CASE Team is proposing again for the 2025 code cycle.

A minimum specific efficiency is proposed for all non-process cooling/freezing evaporators used in refrigerated warehouses. Evaporator specific efficiency is defined as cooling capacity of the evaporator (Btu/hour) divided by the power input (watts) required for the fan motors at rated temperature conditions at 100 percent fan speed. The efficiency parameter is specified in units of BTUh/watt. BTUh/watt is defined as and understood to be “BTU/(hour x watt)” by the refrigeration industry. The rated capacity is defined at 10°F of temperature difference between the incoming air temperature and the saturated evaporating temperature of the refrigerant, assuming a dry coil.

The following values are proposed for different evaporator applications, types, and refrigerants. All evaporator sizes for the refrigerated warehouse building cooler and freezer application would have requirements.

Evaporator Application Liquid Feed Type Refrigerant Type Minimum Efficiency
Freezer Direct Expansion Halocarbon 40 Btuh/watt
Freezer Direct Expansion Ammonia 25 Btuh/watt
Freezer Flooded/ Recirculated Liquid Ammonia 45 Btuh/watt
Freezer Direct Expansion CO2 25 Btuh/watt
Freezer Flooded/ Recirculated Liquid CO2 45 Btuh/watt
Cooler Direct Expansion Halocarbon 45 Btuh/watt
Cooler Direct Expansion Ammonia 35 Btuh/watt
Cooler Flooded/ Recirculated Liquid Ammonia 50 Btuh/watt
Cooler Direct Expansion CO2 35 Btuh/watt
Cooler Flooded/ Recirculated Liquid CO2 50 Btuh/watt


Relevant Documents

CASE Report

Round One Utility-Sponsored Stakeholder Meeting Materials

Provide Feedback

Submit feedback and view the Energy Commission's proceedings and available proposed code language by visiting their 2025 Building Energy Efficiency Standards page.

This measure page will be updated as the 2025 code cycle progresses. For questions or suggestions, email [email protected]. Please include the measure name in the subject line.

Give Us Your Feedback

The Statewide CASE Team values input from all stakeholders engaged in the Title 24, Part 6 code change process. We encourage the open exchange of code change comments and concerns.

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