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Measure Description

This measure will develop prescriptive and performance compliance pathway(s) for all-electric multifamily buildings that use electric appliances for all regulated and non-regulated end uses. This topic builds on the 2019 prescriptive requirements for low-rise residential buildings that allow heat pump water heating (individual water heaters) and space heating. The 2019 update did not address central water heating and non-regulated end uses such as appliances and plug loads.  

The Statewide CASE Team will investigate suitable strategies for achieving all-electric multifamily buildings, including heat pump space heating and cooling, heat pump water heaters (HPWH), heat pump dryers, electric ranges, combined hydronic space and domestic water heating, induction cooking, and any additional energy efficiency measures necessary. Developing an all-electric pathway may involve one or more of the following changes:  

  • Prescriptive packages of measures for all-electric multifamily buildings that meet the respective high-rise and low-rise residential requirements. This effort will involve coordination with the effort to unify multifamily code requirements.  
  • For the performance pathway, revised multifamily building baselines for heating ventilation and air conditioning (HVAC) systems and, if central HPWH are used, for domestic hot water (DHW) systems. The CASE Team will coordinate with companion efforts on changes related to central HPWH. 
  • For both prescriptive and performance pathways, two compliance scenarios will be evaluated:  
  • Create a single all-electric baseline: This scenario proposes that the baseline system fuel type would be electricity regardless of the fuel type of the end uses in the proposed design. The CASE Team would need to demonstrate that the proposed all-electric baseline system would be cost-effective and save as much time dependent valuation (TDV) energy as the existing mixed fuel baseline system. 
  • Develop an alternate pathway for the proposed all-electric design: Revisions will propose that the baseline system fuel type is the same as the proposed design. The revision will make costeffectiveness more achievable for all-electric multifamily buildings. The CASE Team will coordinate with the companion effort to update multifamily prototypes. In this option, proposed designs with gas water heaters will retain a gas water heater baseline.  
  • If needed, establish TDV equivalency, added energy efficiency measures for reduced load. With current TDV value, all-electric multifamily buildings need to include additional energy efficiency measures, compared to mixed-fuel buildings. This analysis will change depending on the metrics that that the Energy Commission develops for 2022 code compliance. Where applicable, federal appliance standards will be assumed. This change would apply to both prescriptive and performance pathways.   
  • Modified appliances and miscellaneous electric load (MEL) modeling rulesets to account for electric dryers, and stovetop/ranges. This work will involve coordination with the effort to update plug load and appliance assumptions across all multifamily buildings.  

Multifamily Outdoor Lighting Power Allowances

This CASE study will investigate energy savings and cost-effectiveness of reducing the Outdoor Lighting Power Allowance (LPA) for multifamily-specific applications. The study will additionally explore elimination of perimeter allowance from the calculation of the General Hardscape allowance to simplify the process of determining the Lighting Power Allowance. This may include a two‐option approach, with one using average allowance values and a second that retains the detail and complexity of current calculation methodologies.

Most outdoor space that is assigned a lighting allowance falls under general hardscape. The total allowance for general hardscape is calculated by combining a site allowance, a perimeter allowance, and an area allowance. Additionally, there are a variety of outdoor LPAs that are permitted to be “layered” on top of the general hardscape allowance if certain conditions exist. This combined calculation approach was developed in the 2005 version of the Title 24, Part 6 subsequently expanded to accommodate the need for more LPA for properties with complex geometries.

The CASE Team has identified an additional goal to reduce negative impacts on human health and the outdoor environment while completing this simplification approach. The CASE Team will review requirements on luminaire shielding, site light levels and lighting controls to minimize negative impact of intrusive lighting on human health per the guidance from the American Medical Association (AMA) Council on Science and Public Health

Relevant Documents

Measure proposals, supporting documents, and other outside references will be made public as they become available.

Provide Feedback

This measure description will be updated as research is developed to support the 2022 code cycle. For questions or suggestions, email info@title24stakeholders.com. 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.

  • Use the form above to provide feedback on this measure.