Needed changes to the allocation can be obtained by changing the parameters used in the allocation factors. In openLCA, for allocation method, select ‘As defined in processes’ should be selected for the calculation(Figure 5).As the allocation factors are critical for correct results, for these processes and life cycle models that use these systems, we strongly recommend working with the updated version 3.0.1 from Agribalyse, which can be freely downloaded via openLCA Nexus.To avoid a division by 0, three processes have been adjusted manually by changing the amount of specific product flows:.Mathematically, this has been solved by dividing the amount value by the allocation factor (see Figure 4).įigure 4: parameterized output and co-products in openLCA To elaborate, we have corrected the amount column for all product outputs so that these include the allocation factor already.
All processes that appear in the databases and have multiple product outputs associated with parameterized allocation factors have been modified.An example below:įigure 2: unparametrized formula in allocation factor in SimaProįigure 3: synonymous dataset in openLCA, with unparameterized allocation factor incorporated in the amountĪt the moment, openLCA 1.10.3 does not deal with parameterized allocation factors while we are thinking to include this in future versions, for Agribalyse and now, we provide the Agribalyse database with a workaround that ensures to obtain the same results when changing the parameters in the allocation, as follows:
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As you probably know, in openLCA, you can specify the type of allocation (physical, or economic, or causal, which is entirely free to define), and select this for the calculation, and thus additional parameterization of allocation factors probably does not add much in SimaPro, you need to address different allocations via allocation parameters (Figure 1).įigure 1: Parameterized outputs and co-products in SimaProĪgribalyse, further, contains unparameterized formulas in the allocation factors for documentation reasons. This modification was needed to correct the predefined allocation factors, which are parameterized in Agribalyse, or expressed as formulas. On openLCA Nexus, we have recently published a modified version of Agribalyse v3.0.1.
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