Carbon Footprint for buses

Nowadays, many cities and transport providers asks for carbon footprint data. By that they usually want to know which carbon dioxide emissions are emitted during operation. Often, the routs and the bus types are known and sometimes data is available for the real fuel consumption.

To make long story short, some examples that have been calculated from statistics from our customers and partners are:

 

Average bus kg CO2 /100 km

Volvo 7700 Euro IV City 2

123

Volvo 8700 D7 Euro IV City 2

112

Volvo 9700 Euro IV Commuter 2

80

Volvo 9700 Euro IV Commuter 2 with I-shift*

71

Volvo 7500 Euro IV Biartic City 2

188

Volvo 7500 Euro IV Biartic BRT

122

* The Volvo I-shift gearbox.

When calculated per passenger km the following table is achieved:

Values in g CO2 per passenger km

Number of passengers

 

10

25

50

80

120

160

Volvo 7700 Euro IV City 2

123

49

26

17

 

 

Volvo 8700 D7 Euro IV City 2

112

46

24

16

 

 

Volvo 9700 Euro IV Commuter 2

80

34

18

 

 

 

Volvo 9700 Euro IV Commuter 2 with I-shift

71

30

16

 

 

 

Volvo 7500 Euro IV Biartic City 2

 

75

40

26

19

15

Volvo 7500 Euro IV Biartic BRT

 

49

26

17

12

10

If you compare to an average European car with one passenger the CO2 emission is 170 kg/km. With 5 travellers the emission becomes 40 kg CO2 / km.

An environmental car in Europe emits 120 kg CO2 / km. They are mostly 4 seated and with a full car with 4 passengers the emission per traveller becomes 34 kg / km.

The bus stands out as a superior choice!

 

“Appendix”

Or, if you like to make calculations based on your own data it is easy to estimate the carbon footprint by carbon dioxide emissions (kg/km):

Fuel consumption (FC): litre per km

              By measurement of the fuel consumption of your rout.

             or

             By approximation

                        Bus type and Typical rout

                        For example by using the first table above.

Fuel type carbon content (CC):

               European diesel: 0.71 kg carbon per litre

               Environmental diesel MK1: 0.70 kg carbon per litre

               Biodiesel RME: 0.47 kg fossile carbon équivalents per litre (using the keys of the proposed EU energy directive)

The formula that you use is given by:

Carbon dioxide emissions (kg)km) = FC * CC * SF

SF is the stochiometric weight increase per carbon atom: (12+16+16)/(12) = 3.67

             12 g per mole carbon atoms

             16 g per mole oxygen atoms

About volvobuses

Adjunct Professor of Catalysis at Chalmers University of Technology. Lives in Gothenburg, Sweden, with my wife and three daughters born in 1991, 1994 and 1997. Is a passionate runner.
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