Division 4.2 Calculation of the CO2 savings

United Kingdom

The total CO₂ savings of the innovative technology (efficient exterior lighting system) are to be calculated by formulae (2), (3) and (4).

For a petrol-fuelled vehicle:

Formula(2):

C_{{CO}_{2}} = (\sum_{j = 1}^{m} {ΔP}_{j} \times {UF}_{j}) \times V_{Pe - P} ∕ η_{A} \times {CF}_{P} ∕ v

For a diesel-fuelled vehicle:

Formula(3)

C_{{CO}_{2}} = (\sum_{j = 1}^{m} {ΔP}_{j} \times {UF}_{j}) \times V_{Pe - D} ∕ η_{A} \times {CF}_{D} ∕ v

For a petrol-fuelled vehicle with turbo charger:

Formula(4)

C_{{CO}_{2}} = (\sum_{j = 1}^{m} {ΔP}_{j} \times {UF}_{j}) \times V_{Pe - PT} ∕ η_{A} \times {CF}_{P} ∕ v

These formulae present the total CO₂ savings of the innovative technology (efficient exterior lighting system) in gCO₂/km.

The input data for the formulae (2), (3) and (4) are:

ΔP_j

Saved electrical power in W of the type of lighting j, which is the result of step 1

UF_j

Usage factor of the type of lighting j, specified in Table 2

Number of types of lighting in the innovative technology package

Mean driving speed of the NEDC, which is 33,58 km/h

V_{Pe – P}

Consumption of effective power for petrol-fuelled vehicles, which is 0,264 l/kWh

V_{Pe – D}

Consumption of effective power for diesel-fuelled vehicles, which is 0,22 l/kWh

V_{Pe – PT}

Consumption of effective power for petrol-fuelled vehicles with turbo charger, which is 0,28 l/kWh

η_A

Efficiency of the alternator, which is 0,67

CF_P

Conversion factor for petrol fuel, which is 2 330 gCO₂/l

CF_D

Conversion factor for diesel fuel, which is 2 640 gCO₂/l

Table 2

Usage factor for different types of lighting