How to use allocation in SimaPro Flow?

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This article aims to explain how you can allocate the process contribution to several output products in SimaPro Flow.
To start, you need to decide on the allocation percentage you would like to allocate to all of the output products. The sum of this allocation should be 100 (%). Then create the process:

  1. Go to the process list in the project
  2. Click create new process
  3. Add all the products in the output tabs and give them the right allocation percentage.
  4. Then, add the input products in the inputs tab.

Remember: two or more output products can only be added in the process list, Canvas does not allow this type of changes. However, after the products have been added to the process then it will show on the Canvas.

The process of producing planks have three input products (raw wood, electricity and water) and two output product (planks and sawdust). Let us set up a diagram of how it would look like:

Allocation model overview
If you like using the canvas for modelling you can:

  1. Double click on the background to create a new process
  2. In this example, we can call it 'Production of planks'
  3. Then, do the same for electricity, water and raw wood.
  4. Thereafter, drag electricity, water and raw wood processes over production of planks one by one to make them inputs to the production process.
  5. Then change the amounts to 100 kWh, 10 kg and 1 kg, respectively. This can be done by clicking on the label on the arrow between the processes. Then you get something similar to this:

Input processes 
To add several output products to the production process, you need to go to the process list and:

  1. Find the 'Production of planks' process
  2. Edit the current output product to become either 'Planks' or 'Sawdust', and add the other product as a second output product.
  3. Make sure that the amount and unit are correct and the allocation percentages are set to 90 and 10, respectively. This is how the edit process window would look:

Edit process window
 Then you get a model similar to this:
Full allocation model

In this example, an economic allocation was used. If you want to learn more about different types of allocations have a look at the Introduction to LCA.