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Measure: Widen zone temperature deadband and add conference room standby control (DDC zone controls)

Building Size: 5,000 gsf
Climate Zone: Hot - Humid

Measure: Widen zone temperature deadband and add conference room standby control (DDC zone controls)

Building Size: 5,000 gsf
Climate Zone: Hot - Humid
Widen zone temperature deadband and add conference room standby control (DDC zone controls)
Measure Simple Payback (years) Approximate Capital Cost ($) Annual Energy Savings (kBtu/sf) Annual Energy Savings (kBtu/yr) Annual Cost Savings ($/sf) Annual Cost Savings ($/yr)
Widen zone temperature deadband and add conference room standby control (DDC zone controls) 1-2 $900 6.3 31,000 $0.09 $470

Description:

Deadband is the difference between the zone heating and cooling temperature setpoints. Widening the zone temperature deadband of the HVAC distribution system (e.g., piping, ductwork, terminal units) will result in measurable energy savings at the HVAC central equipment (e.g., boilers, chillers, air handlers). Putting the HVAC system in standby mode for zones that are unoccupied will also result in energy savings. Specific zone control energy conservation modifications will vary by HVAC system type and the specific needs and capabilities of each facility. In general, for centralized HVAC systems, it’s important to integrate the controls of both the central equipment and the distribution system for maximum energy efficiency and occupant comfort.

Special Considerations

  • For hybrid systems (digital control at the plant, pneumatic at the zones), extending DDC control to the distribution level and providing enough capacity in the DDC system to allow for communication between the central equipment and the distribution system paves the way for implementing advanced control sequences that will help minimize energy consumption of the HVAC system, especially during non-peak heating and cooling periods. Extending digital control to the distribution level also allows operators to monitor performance of these systems and troubleshoot issues faster.

Estimates for this measure come from the Department of Energy's Advanced Energy Retrofit Guide.