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Section 604 Automated Demand-Response (Auto-DR) Infrastructure
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Where this section is indicated to be applicable in Table 302.1, buildings that contain heating, ventilating, air-conditioning (HVAC) or lighting systems shall comply with Sections 604.1 through 604.4. A building energy management and control system (EMCS) shall be provided and integrated with building HVAC systems controls and lighting systems controls to receive an open and interoperable automated demand-response (Auto-DR) relay or Internet signal. Building HVAC and lighting systems and specific building energy-using components shall incorporate preprogrammed demand response strategies that are automated with a demand response automation Internet software client.
- Buildings located where the electric utility or regional Independent System Operator (ISO) or Regional Transmission Operator (RTO) does not offer a demand response program to buildings regulated by this code.
- Buildings with a peak electric demand not greater than 0.75 times that of the standard reference design.
- Buildings that have incorporated onsite renewable energy generation to provide 20 percent or more of the building's energy demand.
The Auto-DR strategy for HVAC systems shall be capable of reducing the building peak cooling or heating HVAC demand by not less than 10 percent when signaled from the electric utility, regional independent system operator (ISO) or regional transmission operator (RTO), through any combination of the strategies and systemic adjustments, including, but not limited to the following:
- Space temperature setpoint reset.
- Increasing chilled water supply temperatures or decreasing hot water supply temperatures.
- Increasing or decreasing supply air temperatures for variable air volume (VAV) systems.
- Limiting capacity of HVAC equipment that has variable or multiple-stage capacity control.
- Cycling of HVAC equipment or turning off noncritical equipment.
- Disabling HVAC in unoccupied areas.
- Limiting the capacity of chilled water, hot water, and refrigerant control valves.
- Limiting the capacity of supply and exhaust fans, without reducing the outdoor air supply below the minimum required by Chapter 4 of the International Mechanical Code, or the minimum required by ASHRAE 62.1.
- Limiting the capacity of chilled water or hot water supply pumps.
- Anticipatory control strategies to precool or preheat in anticipation of a peak event.
The Auto-DR strategy shall include logic to prevent a rebound peak. When the signal for Auto-DR is ended, a gradual return to normal heating, ventilation and air-conditioning (HVAC) equipment operations shall be part of the Auto-DR strategy, through any combination of the strategies and systemic adjustments, including, but not limited to the following:
- Where close to the unoccupied period, the Auto-DR period shall be extended using a rebound avoidance, extended Auto-DR control strategy until the initiation of the unoccupied period.
- Rebound avoidance, slow recovery control strategies, gradually increasing or decreasing space temperature setpoints or a variance in the timing by cooling or heating zone.
- Rebound avoidance, slow recovery control strategies, gradually increasing or decreasing zone supply air temperatures.
- Rebound avoidance, slow recovery control strategies, gradually increasing or decreasing chilled water temperatures or decreasing hot water temperatures.
- Rebound avoidance, sequential equipment recovery strategies, gradually restoring demand limited equipment capacity.
- Rebound avoidance, sequential equipment recovery strategies, gradually restoring equipment that was turned off during the Auto-DR period.
- Rebound avoidance, slow recovery control strategies, gradually increasing capacity for air moving and pumping systems.
- Rebound avoidance, sequential equipment recovery or rebound avoidance, slow recovery control where chilled water or hot water and other capacity control valves are sequentially or gradually allowed to return to normal operation, respectively.
In Group B office spaces, the Auto-DR system shall be capable of reducing total connected power of lighting as determined in accordance with Section C405.5 of the International Energy Conservation Code by not less than 15 percent.
Exception: The following buildings and lighting systems need not be addressed by the Auto-DR system:
- Buildings or portions associated with lifeline services.
- Luminaires on emergency circuits.
- Luminaires located in emergency and life safety areas of a building.
- Lighting in buildings that are less than 5,000 square feet (465 m2) in total area.
- Luminaires located within a daylight zone that are dimmable and connected to automatic daylight controls complying with Section C405.2.2.3.2 of the International Energy Conservation Code.
- Signage used for emergency, life safety or traffic control purposes.
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