The focus of the nonresidential grid integration CASE Report is to adjust the demand response control requirements so buildings that comply with Title 24, Part 6 are more likely to use their controls to participate in demand response events, including pricing events. This will help ensure that newly constructed nonresidential buildings are contributing to grid reliability in a positive way, which is critical as California aims to achieve its renewable portfolio goals.
Indoor Lighting Demand Management
The demand management control requirements for lighting systems were adopted before Title 24, Part 6 lighting power density requirements were based on LED technology. To reflect this shift to LEDs, there are several changes that this submeasure will consider in demand management control requirements.
- Tie the current 0.5 watts per square foot space exemption to the multi-level lighting controls watts per square foot threshold of Section 130.1(b) of the California Energy Code. This link would highlight the demand responsive limiting factor for spaces less than or equal to 0.5 watts per square foot, the lack of multi-level controls. If the multi-level control threshold is updated in future code revisions, this would automatically update the same exemption for demand responsive lighting.
- Reevaluate the cost-effectiveness of the 10,000 square foot demand responsive lighting exemption to establish a new, cost-effective, exemption delineation based on the designed wattage.
- Clarify the dimming requirements of the demand responsive lighting controls acceptance test, NA7.6.3, by removing the current acceptance test requirement that spaces cannot reduce the illuminance of a space from electric and daylighting to less than 50 percent of the designed illuminance.
Demand Management Communication Protocols
This Energy Efficiency Standards language update will maintain the OpenADR requirement of all Virtual End Nodes (VENs) but will remove the internal facility prescriptive communication protocols requirements of Section 110.12(a) 2, 3, & 4. This language removal will create less restrictive requirements for complying with the demand management section of Title 24 Part 6.
Compliance Options to Enable Load Shifting
This submeasure proposes to add compliance options that add or revise features to encourage buildings to pursue grid integration design approaches and technologies. Expanding compliance options provides building owners the opportunity to receive credit when they install the technology or design a building to enable greater demand management and potentially load shifting. Adding these compliance options encourage the market to be retrofit-ready as the technologies mature. Designers will not be required to pursue these options. Buildings will receive credit through the performance approach if they choose to pursue them.
Technologies being considered include:
- Heat Pump Water Heaters With Grid Connectivity
- Thermal energy Storage Systems
Outdoor Lighting Demand Management
The demand management control requirements for lighting systems only addresses indoor lighting. This measure review will explore the cost-effectiveness of including mandatory requirements for outdoor lighting demand management.
Alternative HVAC Control Strategies: Compressor Control
The focus of the nonresidential grid integration CASE initiative is to adjust the demand response control requirements so buildings that comply with Title 24, Part 6 are more likely to use their controls to implement load management on a day to day basis, as well as participate in reliability or economic demand response events. This will help newly constructed nonresidential buildings contribute to grid reliability in a positive way, which is critical as California aims to achieve its energy and climate goals.
Currently, demand responsive controls for HVAC must be capable of increasing or decreasing temperature setpoints by four degrees. This requirement would remain in place, so at a minimum DR controls would be required to enable temperature adjustments to non-critical zones and this temperature adjustment strategy is verified through acceptance testing.
Temperature setpoint adjustments are the most common load management strategy for nonresidential buildings, but other control strategies focusing on specific HVAC equipment exist that offer more direct and focused load management.The current code requires that building have the capability of automatically adjusting temperature setpoints when a Demand Response (DR) Signal is received and that a specific temperature adjustment strategy be programmed into the control system at the time that acceptance testing is conducted.This measure aims to add an alternative pathway to comply with the HVAC DR control requirements to allow a load management strategy that limits the capacity of variable speed compressors. Adding this alternative control strategy enables a building to implement HVAC DR controls that best fits the buildings capabilities.Allowing for successful participation in DR programs at the time that the controls are installed and minimizing a need for reprogramming after the Title 24, Part 6 acceptance tests are complete.
The alternative control strategy will be designed such that the temperature change in the zone will remain within a comfortable range.
In addition to adding an alternative control strategy, this measure aims to realign Title 24, Part 6 language so it is more consistent with how HVAC controls commonly manage loads in nonresidential buildings. Specifically, the Statewide CASE Team is making the following recommendations:
- Revise language to clarify that the demand responsive controls for HVAC systems can either be controlled through the energy management control system (EMCS) or directly through the HVAC system zone controller.
- Revise the term “demand shed control” to reflect the new reality that load management does not always call for load to be reduced or shed
Measure proposals, supporting documents, and other outside references will be made public as they become available.
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.