Report - DCE - Nationalt Center for Miljø og Energi

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Emission factors for container fires cannot de calculated based on an average
floor space but on an average mass. The average mass of a container is set to
1 Mg and covers all types of containers, from small residential garbage containers
to large shipping containers.
The Swedish source Persson et al. (1998) gives emission factors for NOx and
CO expressed as kg per Mg of object burned and divided in three different
objects; house, apartment and schools of average Swedish sizes. The data is
based on the distribution of combustible material in the interior of the different
building types, and does not take into account the combustible material
in the structure itself. These emission factors are recalculated using Danish
data for average building sizes, resulting in the subdivision of building types
in detached, undetached, apartment, industrial buildings and additional
buildings.
Persson et al. (1998) sets a rate of weight loss at 12.4 %, but does not specify
any further on different building types. It seems quite unrealistic that the
same rate of weight loss applies for houses and industrial buildings, resulting
in the conclusion that there is most likely an overestimation on the emission
factors for industrial buildings.
In 2002 a report on the further development of this data was published in
Blomqvist et al. (2002), this report added data for the amount of combustible
material in the building structure. The emission factors from this source is
calculated by combining the estimated amount of combustible material in
the building structure itself, with the amount of combustible interior estimated
in Persson et al. (1998) for the different building types. Again, Danish
data for the average floor space in different building types is used to divided
the emission factors into the six categories; detached houses, undetached
houses, apartment buildings, industrial buildings, additional buildings and
container fires.
The emission factors from both Persson et al. (1998) and Blomqvist et al.
(2002) are probably overestimated due to building traditions, because wood
is use to a further extent in Sweden and Norway contra Denmark.