For the life cycle inventory analysis, the cylinder head product system is established, incorporating the two life cycle scenarios, and elementary flow data is collected for all processes available and scaled according to the reference flow. To create an overview of the cylinder head product system, the inventory is illustrated in figure 3. The complete life cycle inventory, inventory specific data, and values are provided in appendix 2. The life cycle inventory in appendix 2 is based on a combination of theoretical values obtained from secondary data e.g. literature data, engine specification data, and product/process specific data provided by Cast Iron Welding Services. The detailed life cycle inventory system for the cylinder head is illustrated in figure 3 below.
Figure 3 – Life cycle inventory including all foreground and background processes with all elementary flows
Basis for sensitivity analysis
Several parameters are chosen and tested through sensitivity analysis, in order to identify how sensitive the model would be to changes in these parameters, and which changes would be the most impacting ones. This is done by estimating the relative change in an impact category to quantify the sensitivity. To evaluate if the parameter would be sensitive, a relative change larger than 100% and lower than -50% is considered sensitive. The relative change for sensitivity analysis is expressed as follows:
Where RC(%) is the relative change in percent and the IS is the impact score for the impact category in its respective unit. The parameters listed below are thought to be potentially sensitive and may influence the life cycle outcome of the system:
- Increased remanufacturing energy consumption (20%)
- Decreased remanufacturing energy consumption (20%)
- Steel welding rods for remanufacturing
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