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my tip for fixing Internal error in solar radiation distribution (sumsitot) in TRNSYS

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Topic starter

Hello everyone,

I wanted to share a helpful tip for those working on TRNSYS simulation projects and encountering a critical issue related to the solar radiation distribution unit.

  • Fatal Error at time: 762.000000
  • Generated by Unit: 56
  • Generated by Type: 56
  • Message: Internal error in solar radiation distribution (sumsitot) of 4.061 (0.224%) at time=762.00, wavelength band no. 3 (1: total solar, 2: visual solar, 3: non-visual solar)

After careful investigation, I am pleased to inform you that a solution has been identified to resolve this issue. The error was traced back to the data associated with Windows Type 201, causing disruptions in internal radiation calculations. To address this, you should modify the Windows type to eliminate the erroneous data. Subsequent tests have demonstrated a significant improvement.

DavidBradley 08/01/2024 2:11 pm

@dromar123 thank you for the tip. Would you be willing to share what data you found to be erroneous and how you modified it to get that particular glazing system to work?

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