Methoden voor de berekening van de emissies door mobiele ... - CBS

Recreational boat traffic
The emissions are calculated by multiplying the explanatory variables for emissions, the number of
recreational boats (allocated to open motor boats/cabin motor boats and open sailboats/cabin
sailboats) with the average fuel consumption per boat type times the emission factor per substance,
expressed in emission per engine type per quantity of fuel. The various types of boats are equipped
with a specific allocation of engine types that determine the level of the emission factors.
The emission factors are measured in quantities of emission per quantity of generated kinetic energy.
By dividing them with the specific fuel consumption (fuel quantity required per unit of generated kinetic
energy), an emission factor per quantity of fuel is obtained.
For the water emissions, the calculations are described in the fact sheet "engine emissions of
recreational boat traffic" [ref 108: RWS-Waterdienst, 2005]. The air-contaminating emissions from
recreational boat traffic are also included in this fact sheet.
The emission factors for macro-components (in grams/kg fuel) for recreational boats with petrol and
diesel engines are shown in Tables 2.1 through 2.6.
Combustion of motor fuels: N2O and NH3
The combustion emissions within the Netherlands of N2O and NH3 are calculated using the IPCC
defaults for N2O [ref 68: IPCC, 1997] and the emission factors of the EEA for NH3 [ref 60: Ntziachristos and
Samaras, 2000] (Table 2.6). These emission factors are multiplied by the total fuel consumption of inland
navigation in the Netherlands.
Combustion of motor fuels: VOC and PAH components and heavy metals
The calculation of the combustion emissions of VOC and PAH components, including methane, takes
place using profiles. First, as described in Section 1.4.1, the combustion emissions of VOC are
calculated. The profiles indicate the fractions of the various VOC and PAH components in this "total"
VOC. By multiplying total VOC emissions with the fractions from these profiles, the emissions of
individual VOC and PAH components are estimated.
The emissions of heavy metals are calculated by multiplying the fuel consumption with the emission
factors that are based on the metal content of the marine fuels. The emission factors, expressed in
grams per kg of fuel, are shown in Table 2.6. The emission profiles for VOC and PAH components are
shown in table 2.7.
De-gassing cargo fumes to the atmosphere
The calculation of the emissions (including VOC emissions) are conducted for each substance using
the following formula:
Weight of VOC (vapour) emitted =
mass of unloaded cargo (A) * percentage after which the hold is ventilated (B) * evaporation
factor (C)
The required data fall into three categories:
a (A) transport data, originating from statistical information;
a (B) data about the practice of loading and unloading (also linked partially to regulations);
a (C) chemical and physical data, originating from the relevant literature.
In this formula, the weight of the unloaded cargo is the explanatory variable for emissions. The
emission factor is arrived at by multiplying the evaporation factor with the percentage of the unloaded
cargo after which the hold is ventilated. A comprehensive description of the methodology can be found
in the protocol established as part of the EMS project [ref 99: Bolt, 2003].
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