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Self-generating Heat and Electricity

12min

Self Generated 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.

Add Self Generated Electricity

1

Right-click on the screen and select Self-generating Heat and Electricity > Self Generated Electricity

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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.

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Enter the Quantity of electricity generated

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If applicable, add any Notes

For instance, if your self-generated electricity came from solar panels, specify this in the Notes field.

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5

Click Next

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If applicable, add a Fuel

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7

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

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8

Enter the Quantity of Fuel you want to send to the Self Electricity unit

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Click Add

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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

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Edit Self Generated Electricity

1

Right-click on Self Generated Electricity

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Click Edit

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3

Click Next to save your changes

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Delete Self Generated Electricity

1

Right-click on Electricity

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2

Click Delete

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Central Heat Unit

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.

Add Central Heat Unit

1

Right-click on the screen and select Self-generating Heat and Electricity > Central Heat Unit

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2

Specify the heat efficiency

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3

If applicable, add any Notes

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4

Add a Fuel

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5

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

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6

Enter the Quantity of Fuel you want to send to the Central Heat unit

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7

Click Next

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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.

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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 tCOโ‚‚e) by the total heat generated (in TJ):

2,041.83 tCOโ‚‚e รท 25.018 TJ = 81.6143 tCOโ‚‚e/TJ

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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.

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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

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Enter the quantity of heat you want to send to the production process

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Click Add

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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.

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Edit Central Heat Unit

1

Right-click on Central Heat

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2

Click Edit

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3

Click Next to save your changes

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Delete Central Heat Unit

1

Right-click on Central Heat

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2

Click Delete

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Combined Heat and Power (CHP)

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.

Add CHP

1

Right-click on the screen and select Self-generating Heat and Electricity > Combined Heat & Power

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Specify the Source of Values

What are the average efficiencies๏ปฟ?

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Specify the Heat Reference Efficiency

What are the reference efficiencies๏ปฟ?

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Specify the Electricity Reference Efficiency

What are the reference efficiencies๏ปฟ?

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5

If applicable, add any Notes

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Click Next

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7

If applicable, add a Fuel

You can also connect waste gas or heat.

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8

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

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Enter the Quantity of Fuel you want to send to the CHP unit

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Click Add

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Emissions are automatically calculated using the CHP equations๏ปฟ๏ปฟ

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Edit CHP

1

Right-click on CHP

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2

Click Edit

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3

Click Next to save your changes

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Delete CHP

1

Right-click on CHP

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2

Click Delete

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