Problem with Monte Carlo Simulation

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Posts: 15
Joined: 30 Apr 2017 03:55

Problem with Monte Carlo Simulation

Post by smnipa » 16 Aug 2017 05:39

Hi Andrews,
I am using open LCA 1.4.2. I built a supply chain model of textile product. I am facing problem with Monte Carlo simulation as the result from simulation is very unexpected. Calculated LCIA result from analysis is acceptable but Monte Carlo simulation gives unexpected result. To identify the problem I performed Monte Carlo simulation of some individual Ecoinvent process (Ecoinvent dataset) and AusLCI process (AusLCI dataset). The mean values from Monte Carlo of AusLCI processes are almost same with normal result (from analysis) but the mean values from Monte Carlo of Ecoinvent processes are too different from normal result (from analysis). I got an error message from some Ecoinvent processes "An error has occurred. See error log for more details. java.lang.NullPointException". Please see the attached snapshot. Is this problem occurred from Ecoinvent dataset of water emission to air that shows blank in the outflow? Do I need to upgrade my OpenLCA version? Please see the attached snapshots. Please give your advice to solve this issue.
ecoinvent dataset.jpg
ecoinvent dataset.jpg (108.25 KiB) Viewed 1570 times
AusLCI data set.jpg
AusLCI data set.jpg (97.85 KiB) Viewed 1570 times
ecoinvent-simulation polyacrylamide.jpg
ecoinvent-simulation polyacrylamide.jpg (82.19 KiB) Viewed 1567 times
ecoinvent- simulation of sheep fleece.jpg
ecoinvent- simulation of sheep fleece.jpg (109.11 KiB) Viewed 1567 times

Posts: 9
Joined: 26 Sep 2017 10:33

Re: Problem with Monte Carlo Simulation

Post by algae_tom » 06 Oct 2017 18:19

Which version of Ecoinvent are you using? I am having a similar issue which occurs with Ecoinvent 3.1 but not 3.3...

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