AirWare On-line Reference Manual
| | Release Level | 5.4 |
| | Release Date | 2008 10 |
| Revision Level | 1.0 |
|
Last modified on:
Monday, 20-Jul-09 14:03 CEST
|
GHG emission estimates
AirWare maintains a set of emission inventories as OBJECT CLASSES
in the OBJECT DATA BASE with a
class specific selector/navigator for user defined clases of sources
including
- combustion related (point, are and line sources), based on fuel type and consumption as well as
technological parameters;
- process related fugitive emissions (area sources), based on process specific emission factors and
control technologies;
- biogenic emissions (are sources) based on land-use and climatic parameters;
Conceptually, the estimates rea based on:
Monitoring and direct measurement may involve continuous emission monitoring systems
(CEMS) (emissions recorded over an extended and uninterrupted period), predictive emission monitoring
(correlations developed between measured emission rates and process parameters) or source testing (e.g. stack
sampling).
Mass balance involves the application
of the law of conservation of mass to a facility,
process or piece of equipment. Emissions are determined from the difference
in the input and output of a unit
operation where the accumulation and depletion of a
substance are included in the calculations
Emission factors uses emission factors (EF)
to estimate the rate at which a pollutant is released into the atmosphere
(or captured) as a result of some process activity or unit throughput. The EFs
used may be average or general EFs, or technology-specific EFs.
Engineering estimates may involve estimating emissions from engineering principles and
judgement, using knowledge of the chemical and physical processes
involved, the design features of the source, and an understanding
of the applicable physical and chemical laws.
In AirWare, this is implemented as an backward chaining Expert System with
first order production RULES.
