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@kevin-moos kevin-moos commented Sep 2, 2025

Pull request overview

Description of the purpose of this PR

Fix Carroll MRT algorithm imbalance, add unit test to show that it is now balanced, and update documentation. Regressions are expected in CarrollMRT-RefBldgLargeOfficeNew2004_Chicago.idf, _ResidentialBase.idf, and _ResidentialBaseboardHardSize.idf.

The original approach from Carroll's paper didn't balance. The zone's mean radiant temperature was being calculated as:
480166367-3ec203a0-7322-487a-bc73-e674ff8e1a38

It should actually be calculated as:
480166441-f25411b3-4a62-462e-b298-9d8d3d0f70ec

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  • Title of PR should be user-synopsis style (clearly understandable in a standalone changelog context)
  • Label the PR with at least one of: Defect, Refactoring, NewFeature, Performance, and/or DoNoPublish
  • Pull requests that impact EnergyPlus code must also include unit tests to cover enhancement or defect repair
  • Author should provide a "walkthrough" of relevant code changes using a GitHub code review comment process
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  • If any defect files are updated to a more recent version, upload new versions here or on DevSupport
  • If IDD requires transition, transition source, rules, ExpandObjects, and IDFs must be updated, and add IDDChange label
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@tanaya-mankad tanaya-mankad added the Defect Includes code to repair a defect in EnergyPlus label Sep 2, 2025
@kevin-moos kevin-moos marked this pull request as ready for review September 11, 2025 18:28
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kevin-moos commented Sep 12, 2025

@szvsw - we opened a PR for #10755 based on your Unmet Hours post

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szvsw commented Sep 12, 2025

Awesome! Glad to have mildly contributed at least in spirit to E+!

Out of curiosity have you seen any cases where the fixed formula significantly alters results?

@kevin-moos kevin-moos changed the title Fix Carroll MRT Algorithm Imbalance Fix 10755 Carroll MRT Algorithm Imbalance Oct 1, 2025
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Carroll MRT Algorithm Imbalanced

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