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To calculate the greenhouse gas emissions, we have used the following data:
- Heating demand passive house: 68 MJ per square meter and year
- Living area: 140 square meters
- Emissions from the average electricity mix in Sweden: 13 g CO2e per MJ (source: Swedish Energy Agency (2020), refers to the year 2019)
The thermal energy required to heat the passive house for one year is calculated by multiplying the living space by the heating demand per square meter and year.
140 m2 × 68 MJ per m2 and year = 9 520 MJ per year
The calculation shows that a total of 9 520 MJ per year is required. Since the heating is done with electrical radiators, the same amount of electricity needs to be supplied, as all electricity is converted into thermal energy in the radiators.
The greenhouse gas emissions are calculated by multiplying the total demand of electrical energy by the greenhouse gas emissions from electricity.
9 520 MJ per year × 13 g CO2e per MJ ≈ 124 kg CO2e per year
The calculation shows that the emissions amount to 124 kg CO2e, which has been rounded to 120 kg CO2e on the card.
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