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I had calculated allocation factors for my process in the allocation tab. When I wanted to make some changes in the economic values and recalculate them all allocation factors turned to 0 (for all allocation methods) and I cannot calculate new ones. Does anyone have a solution for this problem? (I have already tried to restart program, update Java etc.)

in openLCA by (710 points)

1 Answer

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by (59.1k points)
Which openLCA version are you using? The factor calculation is really stable, it does not work if formula in the process are incorrect e.g. I would recommend to check that (validate the database or the process where you are working on).

 - and sorry for the late reply!
by (180 points)
I think the explanation for this is hinted at in the user manual: " In order for allocation to work, the main product and the co-products of the multioutput process need to have the same flow property."

The manual is not clear about whether they all have to have the same *reference property* or if they all have to have any property in common. Most likely they all have to have the same property as the *reference property* of the *reference output* of the process. In any case, your other coproducts are probably measured in mass, and heat is not.