Kaizen

Convert energy savings to reduction in CO2 emissions (electrical)

Objective/Method/Outcome

Objective: Converts energy savings to reduction in CO2 emissions (electrical).

Method: Calculates the difference between current energy consumption and baseline energy consumption (normalized) and stores the result in a CTL. Uses Emissions Factor (EF) based on energy type and generation, to calculate the reduction in CO2 emissions from energy savings.

Outcome: Outputs a Calculated Trend Log named ‘Weekly CO2 Emissions Reduction [tCO2]’.

Applicable Systems

Any Energy meter.
Primary: AHU, RTU, MUA, ERV, BLR, CHLR
Secondary: HP, FCU, UV, UH

Logic

Once the inputs are interpolated for a daily sample, the logic flow starts by calculating the difference between consecutive energy samples (for both current energy consumption and baseline energy consumption). It then calculates the difference between the two to calculate a reduction in energy consumption. The calculated energy savings (kWh) is multiplied with Emissions Factor (tCO2/kWh) to calculate Daily Avoided CO2 Emissions which is then aggregated for the week to generate the output CTL.

for each day:
   * calculate energy savings as energy baseline - current energy consumption
   * convert this into tonnes of CO2
Calculate the weekly sum of CO2 emisisons

Convert energy savings to reduction in CO2 emissions (electrical)

Description / Method

Calculates a CTL of the difference between current energy consumption and normalized baseline energy consumption. Uses Emissions Factor (EF) based on energy type and generation, to calculate the reduction in CO2 emissions from energy savings.

Notes

EF will differ based on the energy source, and mode of energy generation, and geographical location. Source: https://www.epa.gov/energy/ghg-equivalencies-calculator-calculations-and-references

Rule Template Type

Insight Type: Energy
Trigger Type: N/A

Default Priority

Low

Inputs

Inputs	Units	Tags	Description
Baseline Energy Consumption	kWh	meter,baseline	Typical, historical Energy Consumption
Current Energy Consumption	kWh	meter	Current energy consumption

Constants

Inputs	Units	Default Value	Description
Emissions Factor	metric tons of CO2/kWh	0.000703	Emissions per energy consumed note this is tons not kg

Output Calculated Trend Logs

Output CTL	Units	Frequency	Description
Weekly CO2 Emissions Reduction	tonnes CO2	weekly	Weekly CO2 emissions reduction