Postretrofit Energy Usage And Electric Demand Calculations
Method #1: Single point with manufacturer's performance data
For each HVAC system:
Annual energy use = (Measured Energy Use) x (Full Load Runtime Hours)
Monthly demand use = (Measured Peak Electric Demand Use for System) x (System on/off Status for Each Month)
For each HVAC system:
Annual energy use = (Measured Energy Use) x (Full Load Runtime Hours)
Monthly demand use = (Measured Peak Electric Demand Use for System) x (System on/off Status for Each Month)
Method #2: Multiple point with manufacturer's performance data
For each HVAC system:
Annual energy use = (Measured Energy Use for Each Operating Point) x (Full Load Runtime Hours for Each Operating Point)
Monthly demand use = (Measured Peak Electric Demand Use for System for Each Operating Point) x (Maximum Operating Point for Each Month)
For each HVAC system:
Annual energy use = (Measured Energy Use for Each Operating Point) x (Full Load Runtime Hours for Each Operating Point)
Monthly demand use = (Measured Peak Electric Demand Use for System for Each Operating Point) x (Maximum Operating Point for Each Month)
Method #3: Multiple point using short-term data and manufacturer's performance data
For each HVAC system:
Annual energy use = (Measured Energy Use for Each Operating Point) x (Full Load Runtime Hours for Each Operating Point)
Monthly demand use = (Measured Peak Electric Demand Use for System for Each Operating Point) x (Maximum Operating Point for Each Month)
For each HVAC system:
Annual energy use = (Measured Energy Use for Each Operating Point) x (Full Load Runtime Hours for Each Operating Point)
Monthly demand use = (Measured Peak Electric Demand Use for System for Each Operating Point) x (Maximum Operating Point for Each Month)
Method #4: Short-term monitoring and calibrated, simplified simulation
For each HVAC system:
Annual energy use = (Simulated Energy Use Using Calibrated Air-side Model) x (Binned Weather Data)
Monthly demand use = (Simulated Peak Electric Demand Use for System) x (Maximum Bin Temperature for Month)
For each HVAC system:
Annual energy use = (Simulated Energy Use Using Calibrated Air-side Model) x (Binned Weather Data)
Monthly demand use = (Simulated Peak Electric Demand Use for System) x (Maximum Bin Temperature for Month)
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