The Building Energy Intensity (BEI) object represents the average energy intensity by fuel type across a set of buildings. You can derive this data from published sources or by using energy use records as the data source and then setting up a window of time with some characteristics of the building size and type.
Here are the calculated fields:
Input fields:
Stationary Asset Energy Use (StnryAssetEnrgyUse)
Start Date (StartDate)
End Date (EndDate)
Total Fuel Consumption (kWh) (TotalFuelConsumptionInKwh)
Occupied Floor Area (sqft) (OccupiedFloorAreaInSqft)
Fuel Type (FuelType)
Building Energy Intensity (BldgEnrgyIntensity)
Averaging Window Start Date (AveragingWindowStartDate)
Averaging Window End Date (AveragingWindowEndDate)
Output fields:
Building Energy Intensity (BldgEnrgyIntensity)
Annual Energy Intensity (kWh/sqft) (AnnualEnergyIntensityInKwhSqft)
Annual Energy Intensity (kWh/m2) (AnnualEnergyIntensityInKwhM2)
Building Energy Intensity Value (BldgEnrgyIntensityVal)
Annual Intensity Value (kWh/sqft) (AnnualIntensityValueInKwhSqft)
Annual Intensity Value (kWh/m2) (AnnualIntensityValueInKwhM2)
Calculations
For each Stationary Asset Energy Use
Number of days inside window = Input End Date - Input Start Date
Where:
Input Start Date = If(StnryAssetEnrgyUse.Start Date > BldgEnrgyIntensity.Averaging Window Start Date, StnryAssetEnrgyUse.Start Date, BldgEnrgyIntensity.Averaging Window Start Date)
Input End Date = If(StnryAssetEnrgyUse.End Date < BldgEnrgyIntensity.Averaging Window End Date, StnryAssetEnrgyUse.End Date, BldgEnrgyIntensity.Averaging Window End Date)
Reported days = StnryAssetEnrgyUse.End Date - StnryAssetEnrgyUse.Start Date
Intensity per sqft (kWh/sqft) = StnryAssetEnrgyUse.Total Fuel Consumption In Kwh / StnryAssetEnrgyUse.Occupied Floor Area In Sqft
Intensity per sqft per day (kWh/sqft/day) = Intensity per sqft / Reported days
Intensity per sqft inside window (kWh/sqft) = Intensity per sqft per day * Number of days inside window
For each Fuel Type
Total Energy Intensity (kWh/sqft) = SUM(Intensity per sqft inside window (kWh/sqft))
Total Days = SUM(Number of days inside window)
For each Fuel Type
Total Energy Intensity per Day (kWh/sqft/day) = Total Energy Intensity (kWh/sqft) / Total Days
BldgEnrgyIntensityVal.Annual Intensity Value (kWh/sqft) = Total Energy Intensity per Day (kWh/sqft/day) * 365
BldgEnrgyIntensityVal.Annual Intensity Value (kWh/m2) = BldgEnrgyIntensityVal.Annual Intensity Value (kWh/sqft) * 0.092903
For Building Energy Intensity
BldgEnrgyIntensity.Annual Intensity Value (kWh/sqft) = SUM(BldgEnrgyIntensityVal.Annual Intensity Value (kWh/sqft))
BldgEnrgyIntensity.Annual Intensity Value (kWh/m2) = BldgEnrgyIntensityVal.Annual Intensity Value (kWh/sqft) * 0.092903
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