Self-generating Heat and Electricity
If your installation generates its own electricity, whether from renewable sources or a mix of fuels, you can represent this in the diagram and allocate the generated electricity to your production process(es).
The emissions from your self-generated electricity will be added to your indirect (Scope 2) emissions.
Right-click on the screen and select Self-generating Heat and Electricity > Self Generated Electricity
Select the unit in either MWh or kWh
The electricity emission factor is disabled because it will be automatically calculated once you connect any fuels used to produce your electricity.
If no fuels are connected, the emission factor (EF) will be 0 tCO2/MWh, indicating that you are using renewable energy.
Enter the Quantity of electricity generated
If applicable, add any Notes
For instance, if your self-generated electricity came from solar panels, specify this in the Notes field.
Click Next
If applicable, add a Fuel
Click on the black dot at the edge of the Fuel and drag the line to connect it to one of the black dots on the Self Electricity
Enter the Quantity of Fuel you want to send to the Self Electricity unit
Click Add
Emissions are calculated based on the amount of fuel used to produce the electricity
The example below consumed 5,000 m3 of natural gas in the power unit. The platform automatically performs the following calculation:
20,418.26 tCO2e / 10,000,000 m3 = 0.002042 tCO2e/m3
0.002042 tCO2e/m3 x 5,000 m3 = 10.21 tCO2e
Electricity emission factor (EF) = 10.21 tCO2e / 1 MWh = 10.21 tCO2e/MWh
Right-click on Self Generated Electricity
Click Edit
Click Next to save your changes
Right-click on Electricity
Click Delete
If your installation produces heat centrally and then distributes it to different production processes and/or subprocesses, you can reflect this on the diagram. Only measurable heat should be considered, i.e., heat that is transported through a heat medium such as steam, hot water, liquid salts, etc., and where its flow rate can be measured in pipes, ducts, or similar conduits.
Note: If a production process produces or recovers heat and exports it to another process, the emissions from that heat will be deducted from the first process and attributed to the process consuming the heat.
Right-click on the screen and select Self-generating Heat and Electricity > Central Heat Unit
Specify the heat efficiency
If applicable, add any Notes
Add a Fuel
Click on the black dot at the edge of the Fuel and drag the line to connect it to one of the black dots on the Central Heat
Enter the Quantity of Fuel you want to send to the Central Heat unit
Click Next
The amount of heat generated in the Central Heat unit will be automatically calculated using the net calorific value (NCV) of the fuel
You can connect multiple fuels to your central Heat Unit.
In the example below, we used natural gas with a net calorific value (NCV) of 0.00003574 TJ/mยณ. Therefore, the platform performs the following calculation to determine the total quantity of heat generated:
0.00003574 TJ/mยณ ร 1,000,000 mยณ = 35.74 TJ
The platform then accounts for the heat efficiency that was input, which in this example was 70%. Hence, the heat generated is calculated as:
35.74 TJ ร 0.7 = 25.018 TJ
The emission factor for heat is calculated by dividing the total emissions associated with heat generation (in tCOโe) by the total heat generated (in TJ):
2,041.83 tCOโe รท 25.018 TJ = 81.6143 tCOโe/TJ
If you don't assign an NCV value to the fuel and connect it to the Central Heat unit, no heat quantity will be calculated, and as a result, you won't be able to attribute any heat to the production processes.
Click on the black dot at the edge of the Central Heat and drag the line to connect it to one of the black dots on the Production Process
Enter the quantity of heat you want to send to the production process
Click Add
The heat emissions are automatically allocated to the production process based on the amount of heat used in that specific production process
In the example below, the entire amount of heat is consumed by the production process, so the total emissions from that heat are attributed to the production process.
Right-click on Central Heat
Click Edit
Click Next to save your changes
Right-click on Central Heat
Click Delete
Combined heat and power (CHP), also referred to as "cogeneration", is the simultaneous generation of heat and power in a single integrated process.
The heat produced from CHP is recovered for a useful heat consuming purpose in the form of hot water, steam or hot air, whilst the power output is usually electricity.
Right-click on the screen and select Self-generating Heat and Electricity > Combined Heat & Power
If applicable, add any Notes
Click Next
If applicable, add a Fuel
You can also connect waste gas or heat.
Click on the black dot at the edge of the Fuel and drag the line to connect it to one of the black dots on the CHP
Enter the Quantity of Fuel you want to send to the CHP unit
Click Add
Emissions are automatically calculated using the CHP equations๏ปฟ๏ปฟ
Right-click on CHP
Click Edit
Click Next to save your changes
Right-click on CHP
Click Delete
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