Add Fuel Efficiency for Ideal Loads Air System #10971

Nigusse · 2025-03-05T19:21:29Z

Pull request overview

New Feature:
Modifies Ideal Loads Air System model to report fuel energy consumptions using use specified fuel conversion efficiency values. The efficiency value or values are specified as a schedule value.
Adds Heating and Cooling Fuel Efficiency Fields. The efficiency values are used to convert loads into fuel energy consumptions.
Users can specify the heating and cooling fuel types for reporting to tabular outputs of energy end-uses by fuel type.

Description of the purpose of this PR

Pull Request Author

Reviewer

shorowit · 2025-03-05T19:31:06Z

design/FY2025/NFP-IdealLoadsAirSystem-FuelEfficiency.md

+	 {Fuel_Eff_{cool}} 	= Cooling Fuel Efficiency, [-]
+	 {Fuel_Eff_{heat}} 	= Heating Fuel Efficiency, [-]


If you made these fields schedules, then you could have both inputs and the ability to use EMS actuators.

@shorowit Good point. Your idea is to use the existing schedule actuators if needed to override the efficiency values in the schedule specified.

I support using schedule inputs here as well. And it's easy enough to add a Schedule:Constant if it's a fixed value.

Now, implemented using a schedule object for both cooling and heating fuel efficiency input fields.

nrel-bot-2c · 2025-04-03T00:23:28Z

@Nigusse @Myoldmopar it has been 28 days since this pull request was last updated.

… skip]

Nigusse · 2025-04-30T18:15:34Z

@Myoldmopar I will start changing the Ideal Air Load System module's GetInput() function to JSON format. Please let me know if you have any concerns or if you want me to delay it. Thanks.

github-actions · 2025-05-02T19:41:09Z

⚠️ Regressions detected on macos-14 for commit `e1d6c13`

Regression Summary

EIO: 49
ESO Big Diffs: 25
MTR Big Diffs: 15
Table Big Diffs: 42
Table String Diffs: 21
ESO Small Diffs: 27
BND: 4
MTD: 4
Table Small Diffs: 3
MTR Small Diffs: 9
ERR: 1

github-actions · 2025-05-02T21:00:08Z

⚠️ Regressions detected on macos-14 for commit `f755088`

Regression Summary

BND: 4
MTD: 4
EIO: 1
ESO Big Diffs: 1
MTR Big Diffs: 1
Table Big Diffs: 1
Table String Diffs: 1

github-actions · 2025-05-05T21:20:40Z

⚠️ Regressions detected on macos-14 for commit `bbea19a`

Regression Summary

BND: 4
MTD: 4

Nigusse

Summary Of Changes:

Updated the IDD by adding new input fields for cooling and heating fuel efficiency schedule name
Transitioned GetInput() to use the JSON IDD
Modified the GetInput() for the two new input fields
Fuel energy consumption calculations for the new report variables

Nigusse · 2025-05-06T18:52:16Z

design/FY2025/NFP-IdealLoadsAirSystem-FuelEfficiency.md

+   (6) * Zone Ideal Loads Supply Air Total Cooling Fuel Energy Rate [W] *
+   (7) * Zone Ideal Loads Supply Air Total Heating Fuel Energy [J] *
+   (8) * Zone Ideal Loads Supply Air Total Cooling Fuel Energy [J] *
+```


Implementation and Design Document

Nigusse · 2025-05-06T18:53:32Z

idd/Energy+.idd.in

+       \note ideal air loads into fuel energy consumption.
+       \note The minimum schedule value must be greater than 0.0. The maximum value
+       \note depends on the technology, and can exceed 1.0.
+       \note If blank, cooling fuel efficiency value is always 1.0.


Added Heating and Cooling Fuel Efficiency Schedule Name new input fields.

Nigusse · 2025-05-06T18:54:28Z

src/EnergyPlus/PurchasedAirManager.hh

        int CoolErrIndex; // Cooling setpoint error index (recurring errors)
        int HeatErrIndex; // Heating setpoint error index (recurring errors)
+        Sched::Schedule *heatFuelEffSched = nullptr; // heating feul efficiency schedule
+        Sched::Schedule *coolFuelEffSched = nullptr; // cooling feul efficiency schedule


Pointer member variables for accessing the respective fuel efficiency schedule names.

Nigusse · 2025-05-06T18:55:06Z

src/EnergyPlus/PurchasedAirManager.hh

+        Real64 TotHeatFuelRate;       // Total heating fuel consumption rate [W]
+        Real64 TotCoolFuelRate;       // Total cooling fuel consumption rate [W]
+        Real64 TotHeatFuelEnergy;     // Total heating fuel consumption [J]
+        Real64 TotCoolFuelEnergy;     // Total cooling fuel consumption [J]


Added eight member report variables.

Nigusse · 2025-05-06T18:55:37Z

src/EnergyPlus/PurchasedAirManager.hh

-              SupplyTemp(0.0), SupplyHumRat(0.0), MixedAirTemp(0.0), MixedAirHumRat(0.0)
+              SupplyTemp(0.0), SupplyHumRat(0.0), MixedAirTemp(0.0), MixedAirHumRat(0.0), ZoneTotHeatFuelRate(0.0), ZoneTotCoolFuelRate(0.0),
+              ZoneTotHeatFuelEnergy(0.0), ZoneTotCoolFuelEnergy(0.0), TotHeatFuelRate(0.0), TotCoolFuelRate(0.0), TotHeatFuelEnergy(0.0),
+              TotCoolFuelEnergy(0.0)


Initialized the new member report variables added.

Nigusse · 2025-05-06T19:09:09Z

src/EnergyPlus/PurchasedAirManager.cc

+                            PurchAir.ZoneTotCoolFuelEnergy,
+                            OutputProcessor::TimeStepType::System,
+                            OutputProcessor::StoreType::Sum,
+                            PurchAir.Name);


Added two energy consumption report variables for zones: Zone Ideal Loads Zone Heating Fuel Energy and Zone Ideal Loads Cooling Fuel Energy.

Added two energy consumption report variables for zones: Zone Ideal Loads Zone Heating Fuel Energy and Zone Ideal Loads Cooling Fuel Energy.

How do these differ from "Zone Ideal Loads Supply Air Total Heating Fuel Energy"?

Nigusse · 2025-05-06T19:10:04Z

src/EnergyPlus/PurchasedAirManager.cc

+                            PurchAir.TotCoolFuelRate,
+                            OutputProcessor::TimeStepType::System,
+                            OutputProcessor::StoreType::Average,
+                            PurchAir.Name);


Added two energy consumption rate report variables for supply air: Zone Ideal Loads Supply Air Total Heating Fuel Energy Rate and Zone Ideal Loads Supply Air Total Cooling Fuel Energy Rate.

Nigusse · 2025-05-06T19:11:02Z

src/EnergyPlus/PurchasedAirManager.cc

+                            PurchAir.ZoneTotCoolFuelRate,
+                            OutputProcessor::TimeStepType::System,
+                            OutputProcessor::StoreType::Average,
+                            PurchAir.Name);


Added two energy consumption rate report variables for zones: Zone Ideal Loads Zone Heating Fuel Energy Rate and Zone Ideal Loads Zone Cooling Fuel Energy Rate.

Nigusse · 2025-05-06T19:13:03Z

src/EnergyPlus/PurchasedAirManager.cc

+    Real64 coolFuelEffValue = PurchAir.heatFuelEffSched->getCurrentVal();
+    PurchAir.ZoneTotCoolFuelRate = PurchAir.ZoneTotCoolRate / coolFuelEffValue;
+    PurchAir.TotCoolFuelRate = PurchAir.TotCoolRate / coolFuelEffValue;
+


Calculates Fuel Energy Rates from the Load and user-specified fuel efficiency values.

Nigusse · 2025-05-06T19:13:59Z

src/EnergyPlus/PurchasedAirManager.cc

+    PurchAir.ZoneTotHeatFuelEnergy = PurchAir.ZoneTotHeatFuelRate * TimeStepSysSec;
+    PurchAir.ZoneTotCoolFuelEnergy = PurchAir.ZoneTotCoolFuelRate * TimeStepSysSec;
+    PurchAir.TotHeatFuelEnergy = PurchAir.TotHeatFuelRate * TimeStepSysSec;
+    PurchAir.TotCoolFuelEnergy = PurchAir.TotCoolFuelRate * TimeStepSysSec;


Calculates Fuel Energy consumption from Fuel Consumption rates and elapsed time.

rraustad · 2025-09-25T14:53:35Z

src/EnergyPlus/PurchasedAirManager.cc

+                                s_ipsc->lNumericFieldBlanks,
+                                s_ipsc->lAlphaFieldBlanks,
+                                s_ipsc->cAlphaFieldNames,
+                                s_ipsc->cNumericFieldNames);


getObjectItem isn't used for json processing

rraustad · 2025-09-25T14:59:40Z

src/EnergyPlus/PurchasedAirManager.cc

+            state.dataPurchasedAirMgr->PurchAirNumericFields(purchAirNum).FieldNames = s_ipsc->cNumericFieldNames;
+            Util::IsNameEmpty(state, thisObjectName, s_ipsc->cCurrentModuleObject, ErrorsFound);
+            PurchAir.Name = Util::makeUPPER(thisObjectName);
+            cAlphaFieldName = "Availability Schedule Name";


I don't think you need this string but am now wondering how CheckUniqueNodeNames (line 312) handles json field name?

I considered it during implementation, but I couldn't find a way to do it without saving the field names here. We use these field names in the sizing calculation. See example below:

SizingString = state.dataPurchasedAirMgr->PurchAirNumericFields(PurchAirNum).FieldNames(FieldNum) + " [m3/s]";

rraustad · 2025-09-25T15:07:11Z

src/EnergyPlus/PurchasedAirManager.cc

+                ShowSevereInvalidKey(state, eoh, cAlphaFieldName, fieldValue, "Valid entries are None, FlowRate, Capacity, or FlowRateAndCapacity.");
                ErrorsFound = true;
            } break;
            }


This code, lines 369 - 407, is not needed since this field has a default (i.e., this field will not be blank) and the enum was set at line 368. Same comment for Cooling Limit below.

A6 , \field Heating Limit \type choice \key NoLimit \key LimitFlowRate \key LimitCapacity \key LimitFlowRateAndCapacity \default NoLimit

Well, maybe you do need this code. There is some trickery that resets the Heating Limit based on other inputs. Leave this code as-is.

I take that back. The fields being checked here have \default autosizable so none of the checks will == fields.end(). This code is redundant.

There are additional checks required, which could change the limit value. But these fields will not be blank since they have a default value. I will comment out the code and check if it breaks any of the unit tests.

Each one of these checks use else if (fields.find("something") == fields.end()). Those will never happen because those fields default to autosize if blank so the code drops to the else and gives the same enum as the case statement.

rraustad · 2025-09-25T15:19:49Z

src/EnergyPlus/PurchasedAirManager.cc

+                                     fieldValue,
+                                     "Valid entries are ConstantSensibleHeatRatio, Humidistat, or ConstantSupplyHumidityRatio.");
                ErrorsFound = true;
            }


It is not possible for PurchAir.DehumidCtrlType == HumControl::Invalid since there is a default for this field. This code will never execute. Delete lines 477 - 484. Same for Humidification Control Type lines 490 - 493.

rraustad · 2025-09-25T15:24:56Z

src/EnergyPlus/PurchasedAirManager.cc

+                                          "To activate CO2 simulation, use ZoneAirContaminantBalance object and specify \"Carbon Dioxide "
+                                          "Concentration\"=\"Yes\".");
+                    }
+                } else if (PurchAir.DCVType == DCV::Invalid) {


This else if is not possible since there is a default. The else if can be deleted (it will never execute).

A14, \field Demand Controlled Ventilation Type \key None \key OccupancySchedule \key CO2Setpoint \default None

rraustad

Final comments. The rest looks good.

rraustad · 2025-09-25T15:25:40Z

src/EnergyPlus/PurchasedAirManager.cc

+                cAlphaFieldName = "Outdoor Air Economizer Type";
+                fieldValue = s_ip->getAlphaFieldValue(fields, schemaProps, "outdoor_air_economizer_type");
+                PurchAir.EconomizerType = static_cast<Econ>(getEnumValue(econNamesUC, Util::makeUPPER(fieldValue)));
+                if (PurchAir.EconomizerType == Econ::Invalid) {


Not possible, delete.

A15, \field Outdoor Air Economizer Type \type choice \key NoEconomizer \key DifferentialDryBulb \key DifferentialEnthalpy \default NoEconomizer

rraustad · 2025-09-25T15:26:25Z

src/EnergyPlus/PurchasedAirManager.cc

+                cAlphaFieldName = "Heat Recovery Type";
+                fieldValue = s_ip->getAlphaFieldValue(fields, schemaProps, "heat_recovery_type");
+                PurchAir.HtRecType = static_cast<HeatRecovery>(getEnumValue(heatRecoveryNamesUC, Util::makeUPPER(fieldValue)));
+                if (PurchAir.HtRecType == HeatRecovery::Invalid) {


Not possible.

A16, \field Heat Recovery Type \type choice \key None \key Sensible \key Enthalpy \default None

rraustad · 2025-09-25T15:28:25Z

src/EnergyPlus/PurchasedAirManager.cc

+            cAlphaFieldName = "Cooling Fuel Type";
+            fieldValue = s_ip->getAlphaFieldValue(fields, schemaProps, "cooling_fuel_type");
+            PurchAir.coolingFuelType = static_cast<Constant::eFuel>(getEnumValue(Constant::eFuelNamesUC, Util::makeUPPER(fieldValue)));
+            if (PurchAir.coolingFuelType == Constant::eFuel::Invalid) {


Invalid is not possible. This code will never execute. Delete.

If the value in this field is invalid, it will be captured before it reaches this point. Is that what makes these lines of code redundant?

Yes. The input processor will stop the simulation before reaching this point.

src/EnergyPlus/PurchasedAirManager.cc

rraustad · 2025-09-25T15:38:45Z

src/EnergyPlus/PurchasedAirManager.cc

-                            Constant::eResource::DistrictHeatingWater,
-                            OutputProcessor::Group::HVAC,
-                            OutputProcessor::EndUseCat::Heating);
+                            PurchAir.Name);


But this is heating energy, not fuel energy. So this should have been left here? @mjwitte ?

PurchAir.SenHeatRate = max(PurchAir.SenCoilLoad, 0.0); PurchAir.SenCoolRate = std::abs(min(PurchAir.SenCoilLoad, 0.0)); PurchAir.LatHeatRate = max(PurchAir.LatCoilLoad, 0.0); PurchAir.LatCoolRate = std::abs(min(PurchAir.LatCoilLoad, 0.0)); PurchAir.TotHeatRate = PurchAir.SenHeatRate + PurchAir.LatHeatRate; PurchAir.TotCoolRate = PurchAir.SenCoolRate + PurchAir.LatCoolRate; PurchAir.ZoneSenHeatRate = max(PurchAir.SenOutputToZone, 0.0); PurchAir.ZoneSenCoolRate = std::abs(min(PurchAir.SenOutputToZone, 0.0)); PurchAir.ZoneLatHeatRate = max(PurchAir.LatOutputToZone, 0.0); PurchAir.ZoneLatCoolRate = std::abs(min(PurchAir.LatOutputToZone, 0.0)); PurchAir.ZoneTotHeatRate = PurchAir.ZoneSenHeatRate + PurchAir.ZoneLatHeatRate; PurchAir.ZoneTotCoolRate = PurchAir.ZoneSenCoolRate + PurchAir.ZoneLatCoolRate;

rraustad · 2025-09-25T16:47:46Z

src/Transition/InputRulesFiles/Rules25-1-0-to-25-2-0.md

+
+Append an optional new field A21 which is also F32, "Cooling Fuel Type", defaulted to blank
+
+See pull request [#10971] https://github.com/NREL/EnergyPlus/pull/10971


No need to include this in transition rules since Heating/Cooling Fuel Type has a default and efficiency schedule defaults to AlwaysOn.

I thought we had to always required to provide a transition rule for new fields. Is this because these new fields have default values and are appended at the end? Note that these new fields are outside the "min-field" range.

min-fields does not mean what it did in the past. Defaults now get filled even when past min-fields. Adding blank fields at the end of an object will not provide any benefit except that the user will now see those fields in the input file. For that reason maybe it's OK to leave this as-is but that just means extra work for the transition program (albeit just a little bit of work).

Nigusse · 2025-09-25T18:38:46Z

"But this is heating energy, not fuel energy. So this should have been left here? @mjwitte ?"

@rraustad I did not change any of the existing variables; I added eight new report variables.

Nigusse · 2025-09-25T19:46:25Z

I removed several lines of unnecessary code that check for invalid inputs in fields with default values. By the time the code reaches the get input stage, any invalid values have already been addressed by the input processor. Therefore, there is no need to verify the value of a choice field that has a default value at the get input.

rraustad · 2025-09-26T01:06:23Z

...eering-reference/src/simulation-models-encyclopedic-reference-003/ideal-loads-air-system.tex

+    \begin{itemize}
+      \item {E_heat} = total heating fuel energy comsumption rate (W)
+	  \item {E_cool} = total cooling fuel energy comsumption rate (W)
+	  \item {\dot Q_load_heat} = zone total heating load (W)


These warnings must mean something because building the doc shows some weird formatting. Lines 139 and 140 above are on the same line in the pdf. And the equation definitions are also strange.

I will look into it. @rraustad Thanks.

Addressed the equation format issues and tested it locally. Now, the equations and variable definitions are rendered correctly.

github-actions · 2025-09-26T11:54:31Z

⚠️ Regressions detected on macos-14 for commit `f8ed9e9`

Regression Summary

Audit: 76
MTD: 76
RDD: 73
BND: 4

github-actions · 2025-09-26T12:07:22Z

⚠️ Regressions detected on ubuntu-24.04 for commit `f8ed9e9`

Regression Summary

Audit: 78
MTD: 78
RDD: 75
BND: 4

github-actions · 2025-09-26T20:06:38Z

⚠️ Regressions detected on macos-14 for commit `20b5a51`

Regression Summary

Audit: 76
MTD: 76
RDD: 73
BND: 4

github-actions · 2025-09-26T20:24:09Z

⚠️ Regressions detected on ubuntu-24.04 for commit `20b5a51`

Regression Summary

Audit: 78
MTD: 78
RDD: 75
BND: 4

github-actions · 2025-09-26T21:29:43Z

⚠️ Regressions detected on macos-14 for commit `35ba05f`

Regression Summary

Audit: 76
MTD: 76
RDD: 73
BND: 4

github-actions · 2025-09-26T21:32:37Z

⚠️ Regressions detected on ubuntu-24.04 for commit `35ba05f`

Regression Summary

Audit: 78
MTD: 78
RDD: 75
BND: 4

mitchute · 2025-09-29T14:38:54Z

@rraustad @Nigusse anything else here? I've confirmed the doc issues were addressed.

mitchute · 2025-09-29T17:36:44Z

OK, hearing nothing further, I'm calling this one. Merging.

Nigusse added 2 commits March 5, 2025 13:59

NFP-IdealLoadsAirSystem-FuelEfficiency [decent_ci_skip] [actions skip]

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NFP-IdealLoadsAirSystem-FuelEfficiency [decent_ci_skip]

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Nigusse added the NewFeature Includes code to add a new feature to EnergyPlus label Mar 5, 2025

shorowit reviewed Mar 5, 2025

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Nigusse added 5 commits April 30, 2025 08:17

Modified the NFP-IdealLoadsAirSystem-FuelEfficiency

84e6e94

Merge branch 'develop' into IdealLoadsAirSystem-FuelEfficiency

c30cb32

Document Format Cleanup

47a5970

Added IDD Change Snippet [decent_ci_skip] [actions skip]

d9f631b

maximum limit for the fuel efficiency value [decent_ci_skip] [actions…

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… skip]

Nigusse added 4 commits May 2, 2025 11:00

Purchased AirManager GetInput to JSON

91bf244

Updated error messages reporting and cleanup

129592b

Updated clang format

a6a9090

Added break statement to limit loop run

763a86b

Addressed failed unit tests

16d1ecf

Modified getinput assignment statement for OARequirementsPtr

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Nigusse added 8 commits May 6, 2025 07:54

More cleanup

ca3ffc4

Error message reporting update

02cd7a4

removed redundant report variables reset

d4b4469

Modified Zoe HVAC Ideal Air Loads System object IDD

79307c0

Updates GetInput for Fuel Efficiency Field

ad440a8

Adds Zone Fuel Energy and Rate Calculation

230d618

Adds Supply Air Fuel Energy and Rate Calculation

2ab1164

Updated NFP and NF Implementation Design

4b9f9a1

Nigusse commented May 6, 2025

View reviewed changes

Rolled back clang format change

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rraustad reviewed Sep 25, 2025

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Merged in develop; resolved a conflict in OutputChanges file

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Deleted redundant code that checks fields with default values

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Addressed build error in Ubuntu and Mac machines

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mjwitte added the IDDChange Code changes impact the IDD file (cannot be merged after IO freeze) label Sep 25, 2025

mjwitte added this to the EnergyPlus 25.2 IO Freeze milestone Sep 25, 2025

rraustad reviewed Sep 26, 2025

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Nigusse added 2 commits September 26, 2025 07:10

Attempt to address compiler error

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Merge branch 'develop' into IdealLoadsAirSystem-FuelEfficiency

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Nigusse added 2 commits September 26, 2025 15:28

Modified Equation Format in Eng Ref Doc

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Merge branch 'develop' into IdealLoadsAirSystem-FuelEfficiency

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Corrected the formats for the equations added

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mitchute merged commit b62ff20 into develop Sep 29, 2025
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mitchute deleted the IdealLoadsAirSystem-FuelEfficiency branch September 29, 2025 17:36

		{Fuel_Eff_{cool}} = Cooling Fuel Efficiency, [-]
		{Fuel_Eff_{heat}} = Heating Fuel Efficiency, [-]


		Append an optional new field A21 which is also F32, "Cooling Fuel Type", defaulted to blank

		See pull request [#10971] https://github.com/NREL/EnergyPlus/pull/10971

Add Fuel Efficiency for Ideal Loads Air System #10971

Add Fuel Efficiency for Ideal Loads Air System #10971

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Pull request overview

Description of the purpose of this PR

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nrel-bot-2c commented Apr 3, 2025

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Nigusse commented Apr 30, 2025

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github-actions bot commented May 2, 2025

⚠️ Regressions detected on macos-14 for commit e1d6c13

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github-actions bot commented May 2, 2025

⚠️ Regressions detected on macos-14 for commit f755088

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github-actions bot commented May 5, 2025

⚠️ Regressions detected on macos-14 for commit bbea19a

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Nigusse commented Mar 5, 2025 •

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⚠️ Regressions detected on macos-14 for commit `e1d6c13`

⚠️ Regressions detected on macos-14 for commit `f755088`

⚠️ Regressions detected on macos-14 for commit `bbea19a`

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