Example file CmplxGlz_Daylighting_SouthVerticalVB45deg warmup convergence error

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Domain
backend

Research direction

Start by running CmplxGlz_Daylighting_SouthVerticalVB45deg.idf with the Chicago O'Hare weather file and review the attached warmup report. Compare its warmup behavior with CmplxGlz_Daylighting_SouthVB45deg.idf, then trace the convergence warning to determine whether the oscillation is in the window model or warmup handling. Done means the cause is identified and the defect is corrected or clearly documented.

Written by the indexing model from the issue text.

Description

PriorityLow

Issue overview

CmplxGlz_Daylighting_SouthVerticalVB45deg.idf with Chicago O'Hare weather has warmup problems.

** Severe ** CheckWarmupConvergence: Loads Initialization, Zone="COMFENZONE" did not converge after 25 warmup days. error.

The space is unconditioned on Jan 1, so it's floating, and for some reason it's oscillating ever-so-slightly with small changes in surface temps and window heat gain that keep getting closer with each day, but clearly bouncing to one side then the other and back. Don't know if this is related to the window model or not, but it's interesting to note that CmplxGlz_Daylighting_SouthVB45deg.idf warms up in 6 days. This was noticed while reviewing #6855.

Details

Some additional details for this issue (if relevant):

  • Win64
  • Version of EnergyPlus v9.0.0-0a76546aec
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Dominant language
C++
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