AirWare Reference Manual: Emission estimates

AirWare On-line Reference Manual

Release Level	5.3.0 beta
Release Date	2007 06
Revision Level	1.1

Emission estimates

The emission inventories in AirWare include, for every source and the list of pollutants defined and configured in the system KnowledgeBase on emission value in g/s.

This represents th long-term average emission rate for that source, which is adapted for any emission scenario by temporal scaling factors to extimate values for any specific hour.

The basic emission values for each substance can be edited interactively.

If no value was defined the string undefined is shown to indicate the missing data value.

The emission inventories offer two ways of estimating emission values where no primary data are available:

from fuel type and consumption;
from a qualitative size classification.

Estimating emission from fuel type and consumption

For every emission source of the types: boilers, small stacks, area sources a fuel type (one of a user defined list configured in the systems knowledge base) and a an annual averagefuel consumption can be specified.

Whenever the emission inventory is regenerated (button RECALCULATE) an estimate based on fuel type, fuel consumption, and a fuel type and pollutant specific emission factors.

Emission values that have been estimates are marked with a red asterisk. *

Estimating emissions from qualitative size classification

If neither a directly edited value nor a complete data set for estimation from fuel type and consumption (and corresponding emission factor) is available, a rule-based semi-quantitative approach can be used. This requires a qualitative classification of a source in terms such as small, medium, large (the list of classes and designating symbols is user defined in the KnowledgeBase). The estimation method first established for all source classes the distribution of available emission data. This is then split in linear intervalls according to the number of classes defined by the user. The median of the class corresponding to the qualitative source characterization is then assigned to the source.

Emission values that have been estimates are marked with a red asterisk. *

Update strategy

The emission inventory primarily shows the direct emission estimtes; IF and only IF no direct emission estimate is in the data base (for any or all of the pollutants), the estimation is attempted IF and only IF fuel type and annual fuel consumption are both defined. Then, whenever the emission inventory ir recalculated (the button: RECALCULATE) is pressed) missing, undefined emission values will be replaced with the fuel factor derived estimates wherever possible.

In a second pass, all remaining undefined values will be replaced with the rule based estimate where the relative source size has been defined.

User define values always replace estimated values;
Estimates based on fuel replace the rule-based estimates.