Result for CO2 is 0.Barriers to interoperability pose a serious challenge in the domain of LCI database development and prevent effective data sharing between LCA practitioners. Results calculated with the manually changed factor, just for this process. I am pasting some pictures from a simple multioutput process, setting calculating phyisical allocation factors gets 1/3 and 2/3, setting one of the factors manually to 0.2, for CO2 output, calculates then the respective amount for CO2 as 0.2*2kg.Ĭogeneration multifunctional process, 2kg CO2 outputĬhanged factor for CO2 (i.e., applied causal allocation here) Personally, I think it always makes sense to have allocation factors adding up to 1. The factors entered then are not further automatically normalised (to your point 2). For causal allocation factors, it is reponsibility of the modeler - or put it differently, in causal allocation, which means manual entry of allocation factors, the modeler has the power to set each of the factors for each exchange as he or she wants.
Hi, physical and economic allocation factors in openLCA always add up to 1 since they are calculated automatically. I imagine it is straightforward, but it would be good for the algorithm to be stated explicitly, ideally in the comprehensive user manual.
More generally, can someone from GreenDelta explain how the allocation factors are applied to compute exchange values for the partitioned processes? The user manual describes how the factors are calculated, but not how they are implemented. (3) regardless of that, shouldn't economic allocation factors *always* add up to 1? (2) is it normal for "correct" allocation factors to not add up to 1 in the case that the reference flows have mixed units? (1) are the allocation factors normalized somehow so that the process impacts are fairly allocated according to the proportions specified? The user manual does not explain *how* allocation factors are applied during the LCI computation, so I ask here: is this approach viable? Auto-calculating physical allocation factors doesn't work in this case, but the database author has manually entered values into the "Physical allocation" and "economic allocation" columns. I am working with a database in which a multi-output process has outputs in several different units, some in kg, some in m3 (for some reason they are using m3*a, but I'll roll with it).
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