Delay element

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Peter Serey

• March 09, 2023 08:39

Hi Goldsim community, I am modelling mine water balance and I am thinking to use a delay element in my model. Is there any impact of delay element to mass balance check?

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• Official comment

  

  Rick Kossik

  • March 09, 2023 16:09
  • Edited

  Note that this is not really a mass balance error, as the delay conceptually represents something (e.g., a pipeline, a ditch, a stream) that is conveying water but also actually contains a (usually) small amount of water while conveying it. No mass is loss from the system, and as Ryan points out, it is always fully accounted for, since you can query the amount of mass in the Delay via the Amount_in_Transit output.  Note that using an Information Delay WOULD indeed cause a loss of mass.  I assume that you are adding the Delay to deal with recirculating logic?  This is discussed in the course here: https://www.goldsim.com/Courses/BasicGoldSim/Unit8/Lesson12/

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  Ryan Gilliom

  • March 09, 2023 14:55

  Hi Peter, yes the Material Delay can impact the mass balance check since it holds some amount of material 'in transit' between time steps. This would relate to the 'Amount in Transit' output of the Material Delay element, and can appear as a rising and falling mass balance error (rather than constant, or constantly increasing/decreasing).

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  Peter Serey

  • March 21, 2023 11:43

  Thanks for your response. It does help to solve my problem. Many thanks.

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