Mould growth risk: Isopleth model results

Alles zu DELPHIN, dem Programm zur hygrothermischen Bauteilsimulation.

Moderatoren: ghorwin, fechner, ruisinger

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gismo
Beiträge: 4
Registriert: 17 Jan 2023, 17:29

Mould growth risk: Isopleth model results

Beitrag von gismo »

Dear Delphin team,

I'm evaluating the risk of mould growth on an internal surface for three different scenarios (different indoor conditions and wall assembly).
To do that, I'm using two models available in POSTPROC2: Isopleth model and VTT mould model.

I would like to better understand how the software calculates the number of mould risk days generated by the Isopleth model, as they are not consistent with what I graphically read. For example, Scenario 1 shows a large number of points that exceed the germination limits, but the legend reports only 0.12 days exceeding the red limit for germination. On the other hand, Scenarios 2 and 3 show a lower amount of exceeding points, with a different distribution among the germination limits, but their legends report a largely higher number of mould risk days subdivided among the six categories.
Scenario1-Isopleth.png
Scenario1-Isopleth.png (24.06 KiB) 1156 mal betrachtet
Scenario2-Isopleth.png
Scenario2-Isopleth.png (25.29 KiB) 1156 mal betrachtet
Scenario3-Isopleth.png
Scenario3-Isopleth.png (25.3 KiB) 1156 mal betrachtet
As far as I understand, I can find better matches with the graphical Isopleth output by analysing the VTT model results, which show the highest risk for Scenario 1 (avg Mould Index = 3.5), followed by Scenario 2 (avg Mould Index = 3.2) and 3 (avg Mould Index = 2.8).

To better read the attached graphs, here are some settings:
- simulation time frame: 10 years
- averaging isopleth plot: 96 h (4 days)

Thank you in advance for your support,
fechner
Beiträge: 79
Registriert: 19 Dez 2018, 09:32

Re: Mould growth risk: Isopleth model results

Beitrag von fechner »

Hello,

May you can attach also the project file. I would like to recalculate the results in order to evaluate what happens here.
fechner
Beiträge: 79
Registriert: 19 Dez 2018, 09:32

Re: Mould growth risk: Isopleth model results

Beitrag von fechner »

and I will check the code.
gismo
Beiträge: 4
Registriert: 17 Jan 2023, 17:29

Re: Mould growth risk: Isopleth model results

Beitrag von gismo »

Dear fechner,

The .zip folder includes the project file, customised climate conditions and a couple of edited materials.

The three charts refer to the internal surface (Sc.3) and to the two surfaces facing the air cavity: outer srf (Sc.1) and inner srf (Sc.2).

Let me know if everything is readable or if any input files are missing.
Dateianhänge
Project.zip
(119.66 KiB) 62-mal heruntergeladen
fechner
Beiträge: 79
Registriert: 19 Dez 2018, 09:32

Re: Mould growth risk: Isopleth model results

Beitrag von fechner »

Hello,

Nothing is missing and I can run the calculation. But my isopleth charts look different. Do you used averaging? Do you have limited the isoplet points to a certain time period?
gismo
Beiträge: 4
Registriert: 17 Jan 2023, 17:29

Re: Mould growth risk: Isopleth model results

Beitrag von gismo »

Yes, I applied these settings:
- simulation time frame: 10 years
- averaging isopleth plot: 96 h (4 days)
fechner
Beiträge: 79
Registriert: 19 Dez 2018, 09:32

Re: Mould growth risk: Isopleth model results

Beitrag von fechner »

Ok, there is a bug in the calculation algorithm for the mould risk times in isopleth model. I will fix it and send you a link to the new version by email. I will also put the new version on our server for download as soon as possible.
gismo
Beiträge: 4
Registriert: 17 Jan 2023, 17:29

Re: Mould growth risk: Isopleth model results

Beitrag von gismo »

Hello, everything is clear now!
Thank you for your kind and fast support
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