Energy sources including electricity, natural gas and coal are used in the process of. For example, no additional carbon emissions will be generated during the use of electricity, and only the carbon emissions generated during the production of electricity need to be converted. In addition to the carbon emissions generated during the production of fuel, such fuel energy as natural gas and coal need to be recorded in the carbon emissions directly generated in the process of fuel energy consumption. The calculation of energy carbon emissions is as follows:
Where: 𝐶𝐸 carbon emissions of energy consumption (kgco2); 𝐸e Total power consumption; 𝑓𝐸 carbon emission coefficient of electric energy; 𝐸𝑙 consumption of the 𝑙 fuel; 𝑓𝑙 is the carbon emission coefficient of the manufacturing process of the 𝑙 fuel; 𝑓𝑓 is the carbon emission coefficient of the 𝑓 fuel use process.
Unexpected wastes such as sand ash and slag will be produced in the process of sand casting. The electricity consumed in the treatment of these unexpected wastes is converted into unexpected carbon emission. The calculation of unexpected carbon emission is as follows:
Where: 𝑀 ℎ is the amount of ℎ type waste generated in the, and 𝐸 s ℎ is the power consumption of ℎ type waste per treatment unit.