Estimate of Impact on Inventory Due to Different Data Sources and Methodologies

Abstract

For the production of refrigerators, CO₂ emissions was estimated as affected by variations in estimation of CO₂ emissions from electricity production, and differences in the process data and system boundaries used in the bottom-up approach. The results indicate that the amount of CO₂ emitted in raw materials production was influenced by variations in CO₂ per kWh electricity consumed, but the ratio of CO₂ emis-sions from direct processrelated sources was not influenced. The amount of CO₂ emis-sions in material production and the ratio of CO₂ emissions in material production were influenced by the process data and system boundaries used in the calculations. In particular, as the process of aluminum ingots lead to large CO₂ emissions, it is necessary to carefully consider the system boundary definition use when comparing estimates obtained from different data sources.
The estimated CO₂ emissions obtained via the bottom-up approach was then compared to that obtained using the Input-Output table analysis. The total CO₂ emissions and the relative contribution of different sources in material production were influenced. It is also important to note that the calculated value using the Input-Output table is smaller than that from the bottom-up approach. It is reason that the data in the Input-Output table do not go into sufficient detail.