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RuiweiChen Sep 13, 2016 12:30 PM
Hello, I have 3 questions concerning the report EMEP/EEA air pollutant emission inventory guidebook - 2013, part 1.A.3.b.i - iv.
(1) For the cold-start quotient for calculating the cold-start emissions of road transport, in the table 3-46 on page 64, part 3.4.3.2, this coefficient is less than 1 for VOC if the temperature is higher than 24°C, or for PM if the temperature is higher than 22°C. In these cases, perhaps the cold emissions are less than the hot ones for theses two pollutants, but with the equation (10) in page 42 to calculate the corresponding cold emissions, the results would be negative. Would there be a different formula to calculate the cold emissions for these cases?
(2) Still for the cold emissions, the beta reduction factors are available for post-Euro 1 gasoline vehicles till Euro 4, in table 3-44 on page 63. Is there factors for post-Euro 5 vehicles? Same question for diesel light commercial vehicles of table 3-63, on page 74.
(3) For calculating the cold emissions for post-Euro 1 light commercial vehicles (gasoline or diesel), the part 3.4.3.8 (last paragraph) and 3.4.8.9 (page 73) indicate using the equation (32) on page 66, in which the hot emission is based on Euro-4 vehicles, while the parameter tables recommended are for Euro 2 -- Euro 4 vehicles (table 3-44 for gasoline light commercial vehicles, and table 3-63 for diesel ones). I am wandering if we could use the equation (29) on page 63 instead.
 
Thank you in advance for your kind answers.
Replies (5)
EEA Sep 14, 2016 10:33 AM
Hello,
We will forward your questions to our external experts. We will come back to you as soon as we have answers. Kind regards.
RuiweiChen Sep 14, 2016 03:13 PM
Hello, thank you very much for your kind help!
Best regards.
RuiweiChen Sep 16, 2016 08:36 AM
Hello, thank you very much for your kind help!
Best regards.
EEA Sep 26, 2016 10:06 AM
Hello again,
See answers inserted below your questions:

(1) For the cold-start quotient for calculating the cold-start emissions of road transport, in the table 3-46 on page 64, part 3.4.3.2, this coefficient is less than 1 for VOC if the temperature is higher than 24°C, or for PM if the temperature is higher than 22°C. In these cases, perhaps the cold emissions are less than the hot ones for these two pollutants, but with the equation (10) in page 42 to calculate the corresponding cold emissions, the results would be negative. Would there be a different formula to calculate the cold emissions for these cases?

Indeed, for such high temperatures you may get negative cold-start emissions. This is something that we will investigate for future Guidebook updates. In the meantime, you can assume zero cold-start emissions for high temperatures. Please keep in mind that the temperatures in these equations refer to the average (and not the absolute) temperature over a month.

(2) Still for the cold emissions, the beta reduction factors are available for post-Euro 1 gasoline vehicles till Euro 4, in table 3-44 on page 63. Is there factors for post-Euro 5 vehicles?

The same factor can be used for all post-Euro 4 vehicles.

Same question for diesel light commercial vehicles of table 3-63, on page 74.

For Euro 5 diesel LCVs there is a different equation. Please see Table 3-64.

(3) For calculating the cold emissions for post-Euro 1 light commercial vehicles (gasoline or diesel), the part 3.4.3.8 (last paragraph) and 3.4.8.9 (page 73) indicate using the equation (32) on page 66, in which the hot emission is based on Euro-4 vehicles, while the parameter tables recommended are for Euro 2 -- Euro 4 vehicles (table 3-44 for gasoline light commercial vehicles, and table 3-63 for diesel ones). I am wandering if we could use the equation (29) on page 63 instead.

Yes, you can use Equation 29 (p. 63).
 
Kind regards
 
RuiweiChen Oct 30, 2016 02:29 PM
Hello, thank you very much for your detailed answers. That helps me a lot.

Kind regards,

Ruiwei
 
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