Hello openLCA users,
I hope somebody more experienced than me can explain the diffrence between processes and product systems in terms of calculating and modelling.
I am creating an LCA for a cleaning product using EF_secondarydata_201908 database and EF LCIA method. The cleaning product I am analysing doesn´t have many ingredients, and therefore therefore the flows are quite straightforward: there are 5 raw materials, some transportation, packaging, and electricity usage.
I am thinking to only create one process, and from that to create one product system which will have all the inputs, and the output would be the cleaning product.
The second option I have in mind is to create 3 different processes representing:
1. Production (= raw materials, energy, transportation),
2. Packaging ( = materials for producing the packaging, energy, and transportation),
3. Use (=packaging becomes waste, cleaning product becomes wastewater)
After that to create one product system for each process, and then to create one final product system consisting of these 3 product systems.
Are these two options any different in terms of calculating the environmental impact? What I´m thinking is that it only makes a difference in modeling, i.e. maybe the second option is better for presenting the flows and processes visually.?
And secondly, when I am creating processes, should I create unit processes or system processes?
Thanks in advance for any response.