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Open a process data set, go to the page ‘general information’, and click on ‘Create product system’. 3.1 Product system creation from a process data set The first possibility is to create the product system from the process. For the paper cup (modeled with lid), the considered processes are instead production, use and final disposal. ways for creating and completing product systems, depending on the database and user preferences. I think, you should create unit processes. Two washing options have been considered: by hand or by a dishwasher. this way, you only have to create one product system, which incorporates all three processes.
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output flow of packaging is an input flow for use meaning: output flow of production is an input flow for packaging. - create the three processes in a way, that they are connected.Maybe you want to model a product system in the future, which uses the same production and packaging, but a different user behavior? In this case you can re-use the already created processes. Also, this allows you to re-use modelled processes. You are right: in terms of transparency, presentation and analysis, it is always beneficial to model a system as close to reality as possible (real world independent activities, such as production and use are represented by multiple processes in openLCA). Generally, the results will not differ, independent of whether you have multiple processes in your product system or just one "black-box" process which aggregates all the flows. maybe the second option is better for presenting the flows and processes visually.?Īnd secondly, when I am creating processes, should I create unit processes or system processes? Use (=packaging becomes waste, cleaning product becomes wastewater)Īfter that to create one product system for each process, and then to create one final product system consisting of these 3 product systems.Īre 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. Packaging ( = materials for producing the packaging, energy, and transportation),ģ. openLCA 1. Production (= raw materials, energy, transportation),Ģ. Flow properties (water content etc.): in ecoinvent linked to an exchange, in openLCA and ILCD linked to a flow Waste is a negatic amount in ecoinvent 3. The first process is diesel production and the other one is lorry transportion. The second option I have in mind is to create 3 different processes representing:ġ. Im a new user of OpenLCA, I used to work with GaBi 4.Well, Im trying use OpenLCA with a product system that has two process. 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 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 creating an LCA for a cleaning product using EF_secondarydata_201908 database and EF LCIA method. I hope somebody more experienced than me can explain the diffrence between processes and product systems in terms of calculating and modelling.