Duct Static

Pressure Reset

Excess fan energy is often spent over pressurizing the building supply ducts when all downstream zones are satisfied. Typically, an air handling unit (AHU) will modulate the variable speed supply fan to maintain a fixed static pressure set point, which is set based on the system needs during a design day condition (very hot or very cold). Resetting this setpoint down during periods of low load will save fan energy and prolong equipment lifetimes.

Duct Static

CONSIDERATIONS

  • Must be a variable volume system with variable speed supply fans.
  • Must have direct digital control (DDC) building automation for the airside equipment.
  • Programmed based on downstream variable air volume (VAV) box damper positions; customized thresholds should be investigated by a controls vendor and airside balancer.

KEY PERFORMANCE INDICATORS (KPIS)

  • 1-2 point energy use intensity {EUI} reduction potential
  • 1-2% sitewide electric savings
  • <1 year simple payback

Patient Earth E-Book guides you on the path to achieve measurable sustainability goals

Begin here to explore a complex issue, gaining access to dozens of practical strategies to cut your carbon emissions while maximizing your return on investment.

Patient Earth eBook