Non-road fuel consumption and pollutant emissions ... - BAFU - CH

Non-road fuel consumption and pollutant emissions FOEN 2008 20
4.2.3 Inventory model
For the period concerned, age distribution and inventory data can be used as the basis
for calculating segment-specific inventory models for the various machine and appliance
categories. In the inventory model, the machines and appliances for each segment
are depicted by age or year of manufacture.
Fig. 4 > Inventory model based on the example of road finishing machines (construction machinery)
Distribution of inventory by year of manufacture in a given reference year. The inventory model
was calculated in accordance with the data from the new non-road database in 5-year intervals.
This explains the angular nature of the curves.
Inventory
500
400
300
200
100
0
1980 1985 1990 1995 2000 2005 2010 2015 2020
Year of manufacture
1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980
1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008
2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
4.2.4 Operating hours
For each machine type, the number of operating hours was entered specific to the
corresponding engine-power class. In addition, assumptions were made regarding the
development of operating hours of the machines and appliances in each engine-power
class over the period under observation. For this purpose it was assumed that the useful
life of a machine increases in proportion to its engine power. This assumption was
based on information provided in the questionnaires, the findings of groups of experts
(A15) and information obtained from existing literature (IFEU 1999, SBV 2004).