Fix #10663 - Fan runtime fraction < 1 when flow rate scaling using DesignSpecification:ZoneHVAC:Sizing #10673

jmarrec · 2024-08-21T08:22:07Z

Pull request overview

Fixes Fan runtime fraction < 1 when flow rate scaling using DesignSpecification:ZoneHVAC:Sizing #10663

Pull Request Author

Add to this list or remove from it as applicable. This is a simple templated set of guidelines.

Reviewer

This will not be exhaustively relevant to every PR.

jmarrec · 2024-08-21T08:22:38Z

src/EnergyPlus/WindowAC.cc

@@ -1011,7 +1011,7 @@ namespace WindowAC {
                zoneEqSizing.SizingMethod(SizingMethod) = CapSizingMethod;
                if (CapSizingMethod == CoolingDesignCapacity || CapSizingMethod == CapacityPerFloorArea ||
                    CapSizingMethod == FractionOfAutosizedCoolingCapacity) {
-                    if (CapSizingMethod == HeatingDesignCapacity) {
+                    if (CapSizingMethod == CoolingDesignCapacity) {


This was an existing logic error that I noticed

Good catch. Without example files or unit tests these are hard to find.

jmarrec · 2024-08-21T08:22:50Z

src/EnergyPlus/WindowAC.cc

+            // Make the Fan be sized by this
+            zoneEqSizing.CoolingAirFlow = true;
+            zoneEqSizing.CoolingAirVolFlow = windowAC.MaxAirVolFlow;


This will size the Fan to match.

EnergyPlus/src/EnergyPlus/Autosizing/SystemAirFlowSizing.cc

Lines 237 to 238 in f274ccb

} else if (this->zoneEqSizing(this->curZoneEqNum).CoolingAirFlow && !this->zoneEqSizing(this->curZoneEqNum).HeatingAirFlow) {

this->autoSizedValue = this->dataFracOfAutosizedCoolingAirflow * this->zoneEqSizing(this->curZoneEqNum).CoolingAirVolFlow;

In SystemAirFlowSizing, if CoolingAirVolFlow = windowAC.MaxAirVolFlow (which should be already adjusted?) and dataFracOfAutosizedCoolingAirflow = the target fraction, then how does this get the right answer? I would think this would either be 1 * adjusted air flow or fraction * design air flow. This looks like it's fraction * adjusted air flow. Maybe windowAC.MaxAirVolFlow is the design air flow which gets multiplied by the fraction. In any event you are getting the right answer now.

Apologies, I linked to the wrong bit in SystemAirFlowSizing. The correct bit is:

EnergyPlus/src/EnergyPlus/Autosizing/SystemAirFlowSizing.cc

Lines 619 to 620 in 54f875d

if (this->zoneEqSizing(this->curZoneEqNum).CoolingAirFlow && !this->zoneEqSizing(this->curZoneEqNum).HeatingAirFlow) {

this->autoSizedValue = this->zoneEqSizing(this->curZoneEqNum).CoolingAirVolFlow;

Process 2757796 stopped * thread #1, name = 'energyplus', stop reason = step over frame #0: 0x00007ffff50d4370 libenergyplusapi.so.24.2.0`EnergyPlus::SystemAirFlowSizer::size(this=0x00007fffffff4d88, state=0x00007fffffffa980, _originalValue=-99999, errorsFound=0x00007fffffff529f) at SystemAirFlowSizing.cc:620:54 617 } 618 } else { 619 if (this->zoneEqSizing(this->curZoneEqNum).CoolingAirFlow && !this->zoneEqSizing(this->curZoneEqNum).HeatingAirFlow) { -> 620 this->autoSizedValue = this->zoneEqSizing(this->curZoneEqNum).CoolingAirVolFlow; 621 if (this->finalZoneSizing(this->curZoneEqNum).CoolDDNum > 0 && 622 this->finalZoneSizing(this->curZoneEqNum).CoolDDNum <= state.dataEnvrn->TotDesDays) { 623 DDNameFanPeak = state.dataWeather->DesDayInput(this->finalZoneSizing(this->curZoneEqNum).CoolDDNum).Title; (lldb) p this->zoneEqSizing(this->curZoneEqNum).CoolingAirVolFlow (Real64) 0.28246116346780509

jmarrec · 2024-08-21T08:28:10Z

tst/EnergyPlus/unit/WindowAC.unit.cc

+        "    WindowACSizing;          !- Design Specification ZoneHVAC Sizing Object Name",
+
+        // NOTE: Only difference here is that I'm settting a DesignSpecification:ZoneHVAC:Sizing
+        "  DesignSpecification:ZoneHVAC:Sizing,",
+        "    WindowACSizing,          !- Name",
+        "    FractionOfAutosizedCoolingAirflow,  !- Cooling Supply Air Flow Rate Method",
+        "    ,                        !- Cooling Supply Air Flow Rate {m3/s}",
+        "    ,                        !- Cooling Supply Air Flow Rate Per Floor Area {m3/s-m2}",
+        "    0.5,                     !- Cooling Fraction of Autosized Cooling Supply Air Flow Rate",
+        "    ,                        !- Cooling Supply Air Flow Rate Per Unit Cooling Capacity {m3/s-W}",
+        "    FractionOfAutosizedCoolingAirflow,  !- No Load Supply Air Flow Rate Method",
+        "    ,                        !- No Load Supply Air Flow Rate {m3/s}",
+        "    ,                        !- No Load Supply Air Flow Rate Per Floor Area {m3/s-m2}",
+        "    0.5,                     !- No Load Fraction of Cooling Supply Air Flow Rate",
+        "    ,                        !- No Load Fraction of Heating Supply Air Flow Rate",
+        "    None,                    !- Heating Supply Air Flow Rate Method",
+        "    ,                        !- Heating Supply Air Flow Rate {m3/s}",
+        "    ,                        !- Heating Supply Air Flow Rate Per Floor Area {m3/s-m2}",
+        "    ,                        !- Heating Fraction of Heating Supply Air Flow Rate",
+        "    ,                        !- Heating Supply Air Flow Rate Per Unit Heating Capacity {m3/s-W}",
+        "    FractionOfAutosizedCoolingCapacity,  !- Cooling Design Capacity Method",
+        "    ,                        !- Cooling Design Capacity {W}",
+        "    ,                        !- Cooling Design Capacity Per Floor Area {W/m2}",
+        "    0.5;                     !- Fraction of Autosized Cooling Design Capacity",


New unit test that uses a DesignSpecification:ZoneHVAC:Sizing

jmarrec · 2024-08-21T08:28:40Z

tst/EnergyPlus/unit/WindowAC.unit.cc

+    double constexpr expected_full_airflow = 0.041484382187390034;
+    double constexpr scaler_cooling_saf = 0.5;
+    double constexpr scaler_cooling_cap = 0.5;
+    double constexpr expected_full_cap = 622.50474573886743;
+
+    auto const &windowAC = state->dataWindowAC->WindAC(compIndex);
+
+    ASSERT_GT(windowAC.FanIndex, 0);
+    auto const &fan = state->dataFans->fans(windowAC.FanIndex);
+
+    auto const &finalZoneSizing = state->dataSize->FinalZoneSizing(1);
+
+    EXPECT_NEAR(expected_full_airflow, finalZoneSizing.DesCoolVolFlow, 0.0001);
+
+    ASSERT_GT(windowAC.HVACSizingIndex, 0);
+    auto const &zoneHVACSizing = state->dataSize->ZoneHVACSizing(windowAC.HVACSizingIndex);
+
+    EXPECT_EQ(DataSizing::FractionOfAutosizedCoolingAirflow, zoneHVACSizing.CoolingSAFMethod);
+    EXPECT_EQ(scaler_cooling_saf, zoneHVACSizing.MaxCoolAirVolFlow);
+    EXPECT_EQ(DataSizing::FractionOfAutosizedCoolingCapacity, zoneHVACSizing.CoolingCapMethod);
+    EXPECT_EQ(scaler_cooling_cap, zoneHVACSizing.ScaledCoolingCapacity);
+
+    EXPECT_EQ(windowAC.DXCoilType_Num, HVAC::Coil_CoolingAirToAirVariableSpeed);
+    ASSERT_GT(windowAC.DXCoilIndex, 0);
+    auto const &varSpeedCoil = state->dataVariableSpeedCoils->VarSpeedCoil(windowAC.DXCoilIndex);
+
+    // check Sizing
+    EXPECT_NEAR(expected_full_airflow * scaler_cooling_saf, windowAC.MaxAirVolFlow, 0.0001);
+    EXPECT_NEAR(expected_full_airflow * scaler_cooling_saf, fan->maxAirFlowRate, 0.0001);


Check that the Fan too is size at 0.5 of full flow

From my previous comment about SystemAirFlowSizing, windowAC.MaxAirVolFlow is already adjusted. Now I'm confused.

jmarrec · 2024-08-21T08:31:12Z

tst/EnergyPlus/unit/WindowAC.unit.cc

+    EXPECT_NEAR(expected_full_airflow * scaler_cooling_saf, windowAC.MaxAirVolFlow, 0.0001);
+    EXPECT_NEAR(expected_full_airflow * scaler_cooling_saf, fan->maxAirFlowRate, 0.0001);
+
+    EXPECT_NEAR(622.505, varSpeedCoil.RatedCapCoolTotal, 0.001);


Note that the Coil:Cooling:DX:VariableSpeed is not affected.

I don't know if we would want that.

SizeVarSpeedCoil seem to not call the Autosizing modules. Instead, it uses the FinalZoneSizing's DesCoolVolFlow / DesCoolHeatFlow. cf

EnergyPlus/src/EnergyPlus/VariableSpeedCoils.cc

Lines 4715 to 4717 in f274ccb

CheckZoneSizing(state, format("COIL:{}{}", varSpeedCoil.CoolHeatType, CurrentObjSubfix), varSpeedCoil.Name);

RatedAirVolFlowRateDes = max(state.dataSize->FinalZoneSizing(state.dataSize->CurZoneEqNum).DesCoolVolFlow,

state.dataSize->FinalZoneSizing(state.dataSize->CurZoneEqNum).DesHeatVolFlow);

The VS coil should be adjusted but it was never converted to use the sizing routines. That begs an open issue to adjust VS coil sizing when DesignSpecification:ZoneHVAC:Sizing is used.

Filed at #10699

jmarrec · 2024-08-21T08:34:09Z

src/EnergyPlus/WindowAC.cc

+                // capacity sizing methods (HeatingDesignCapacity, CapacityPerFloorArea, FractionOfAutosizedCoolingCapacity, and
+                // FractionOfAutosizedHeatingCapacity )
+                int const CapSizingMethod = zoneHVACSizing.CoolingCapMethod;
+                zoneEqSizing.SizingMethod(SizingMethod) = CapSizingMethod;


Note: I'm not sure if this is right... (this is pre-existing)

At this point in time, SizingMethod is either HVAC::CoolingAirflowSizing, or HVAC::CoolingCapacitySizing if the SAFMethod is FlowPerCoolingCapacity.

I think the intent here is to set the CoolingCapacitySizing method specifically, so it should be HVAC::CoolingCapacitySizing, right?

The intent for FlowPerCoolingCapacity is:

calc design capacity using zone design air flow rate

set fraction that will adjust zone design air flow when air flow is sized (which will also adjust capacity when capacity is sized)

just to be clear, you're saying this is currently correct right?

Then the next time you call using HVAC::CoolingCapacitySizing the adjusted air flow rate would be used. It appears to me that the capacity sizer should be called here using SizingMethod = HVAC::CoolingCapacitySizing;. It looks like 1) state.dataSize->DataFlowUsedForSizing was not reset above to be an air flow rate (and DataFlowPerCoolingCapacity should be reset to 0), and 2) the sizing method should be explicitly set for capacity sizing (right now is looks to still be fraction of capacity).

If you single step this a couple times you should see the capacity getting set using zone design air flow, the air flow being adjusted based on capacity, and the capacity being calculated again using the new air flow rate.

… the variables, initialize them, don't check 4 times if CurZoneEqNum is > 0

jmarrec · 2024-08-21T12:28:57Z

Note: these files are on DefectFiles support repo.

Taking the WindACAuto.idf and a modified Version WindACAutoScaled.idf that adds a DesignSpecification:ZoneHVAC:Sizing for the Zone1WindAC

I also added

  Output:Variable,Zone1WindACAirOutletNode,System Node Standard Density Volume Flow Rate,Detailed;
  Output:Variable,Zone1WindACFan,Fan Runtime Fraction,Detailed;

There is zero change for the WindACAuto.idf, as expected.

jmarrec · 2024-08-21T12:33:26Z

Comparing the component sizes

rraustad

This does look right except that 1 question with SystemAirFlowSizing.

rraustad · 2024-08-21T13:04:08Z

src/EnergyPlus/WindowAC.cc

+                // capacity sizing methods (HeatingDesignCapacity, CapacityPerFloorArea, FractionOfAutosizedCoolingCapacity, and
+                // FractionOfAutosizedHeatingCapacity )
+                int const CapSizingMethod = zoneHVACSizing.CoolingCapMethod;
+                zoneEqSizing.SizingMethod(SizingMethod) = CapSizingMethod;


The intent for FlowPerCoolingCapacity is:

calc design capacity using zone design air flow rate

set fraction that will adjust zone design air flow when air flow is sized (which will also adjust capacity when capacity is sized)

rraustad · 2024-08-21T13:15:50Z

src/EnergyPlus/WindowAC.cc

@@ -1011,7 +1011,7 @@ namespace WindowAC {
                zoneEqSizing.SizingMethod(SizingMethod) = CapSizingMethod;
                if (CapSizingMethod == CoolingDesignCapacity || CapSizingMethod == CapacityPerFloorArea ||
                    CapSizingMethod == FractionOfAutosizedCoolingCapacity) {
-                    if (CapSizingMethod == HeatingDesignCapacity) {
+                    if (CapSizingMethod == CoolingDesignCapacity) {


Good catch. Without example files or unit tests these are hard to find.

rraustad · 2024-08-21T13:23:49Z

src/EnergyPlus/WindowAC.cc

+            // Make the Fan be sized by this
+            zoneEqSizing.CoolingAirFlow = true;
+            zoneEqSizing.CoolingAirVolFlow = windowAC.MaxAirVolFlow;


In SystemAirFlowSizing, if CoolingAirVolFlow = windowAC.MaxAirVolFlow (which should be already adjusted?) and dataFracOfAutosizedCoolingAirflow = the target fraction, then how does this get the right answer? I would think this would either be 1 * adjusted air flow or fraction * design air flow. This looks like it's fraction * adjusted air flow. Maybe windowAC.MaxAirVolFlow is the design air flow which gets multiplied by the fraction. In any event you are getting the right answer now.

rraustad · 2024-08-21T13:36:31Z

tst/EnergyPlus/unit/WindowAC.unit.cc

+    double constexpr expected_full_airflow = 0.041484382187390034;
+    double constexpr scaler_cooling_saf = 0.5;
+    double constexpr scaler_cooling_cap = 0.5;
+    double constexpr expected_full_cap = 622.50474573886743;
+
+    auto const &windowAC = state->dataWindowAC->WindAC(compIndex);
+
+    ASSERT_GT(windowAC.FanIndex, 0);
+    auto const &fan = state->dataFans->fans(windowAC.FanIndex);
+
+    auto const &finalZoneSizing = state->dataSize->FinalZoneSizing(1);
+
+    EXPECT_NEAR(expected_full_airflow, finalZoneSizing.DesCoolVolFlow, 0.0001);
+
+    ASSERT_GT(windowAC.HVACSizingIndex, 0);
+    auto const &zoneHVACSizing = state->dataSize->ZoneHVACSizing(windowAC.HVACSizingIndex);
+
+    EXPECT_EQ(DataSizing::FractionOfAutosizedCoolingAirflow, zoneHVACSizing.CoolingSAFMethod);
+    EXPECT_EQ(scaler_cooling_saf, zoneHVACSizing.MaxCoolAirVolFlow);
+    EXPECT_EQ(DataSizing::FractionOfAutosizedCoolingCapacity, zoneHVACSizing.CoolingCapMethod);
+    EXPECT_EQ(scaler_cooling_cap, zoneHVACSizing.ScaledCoolingCapacity);
+
+    EXPECT_EQ(windowAC.DXCoilType_Num, HVAC::Coil_CoolingAirToAirVariableSpeed);
+    ASSERT_GT(windowAC.DXCoilIndex, 0);
+    auto const &varSpeedCoil = state->dataVariableSpeedCoils->VarSpeedCoil(windowAC.DXCoilIndex);
+
+    // check Sizing
+    EXPECT_NEAR(expected_full_airflow * scaler_cooling_saf, windowAC.MaxAirVolFlow, 0.0001);
+    EXPECT_NEAR(expected_full_airflow * scaler_cooling_saf, fan->maxAirFlowRate, 0.0001);


From my previous comment about SystemAirFlowSizing, windowAC.MaxAirVolFlow is already adjusted. Now I'm confused.

rraustad · 2024-08-21T13:38:17Z

tst/EnergyPlus/unit/WindowAC.unit.cc

+    EXPECT_NEAR(expected_full_airflow * scaler_cooling_saf, windowAC.MaxAirVolFlow, 0.0001);
+    EXPECT_NEAR(expected_full_airflow * scaler_cooling_saf, fan->maxAirFlowRate, 0.0001);
+
+    EXPECT_NEAR(622.505, varSpeedCoil.RatedCapCoolTotal, 0.001);


The VS coil should be adjusted but it was never converted to use the sizing routines. That begs an open issue to adjust VS coil sizing when DesignSpecification:ZoneHVAC:Sizing is used.

Myoldmopar · 2024-08-21T13:53:59Z

Thanks for the review on this @rraustad, seems like this is very close, just maybe one remaining issue.

rraustad · 2024-08-21T14:01:46Z

This data shows that the single speed DX coil air flow was adjusted so it follows that the VS DX coil air flow should also be adjusted. Also in this data, why is the window AC scaled-ori and scaled-new values both equal to 0.02832 and the single speed DX coil air flow rate different?

rraustad · 2024-08-27T13:02:14Z

src/EnergyPlus/WindowAC.cc

                    }
                    bool errorsFound = false;
                    CoolingCapacitySizer sizerCoolingCapacity;
-                    sizerCoolingCapacity.overrideSizingString(SizingString);
+                    sizerCoolingCapacity.overrideSizingString("");
                    sizerCoolingCapacity.initializeWithinEP(state, CompType, CompName, PrintFlag, RoutineName);
                    state.dataSize->DataCapacityUsedForSizing = sizerCoolingCapacity.size(state, TempSize, errorsFound);


Yes, this does look correct. Call the cooling capacity sizer which uses zone design air flow.

rraustad · 2024-08-27T13:02:38Z

src/EnergyPlus/WindowAC.cc

                    sizerCoolingCapacity.initializeWithinEP(state, CompType, CompName, PrintFlag, RoutineName);
                    state.dataSize->DataCapacityUsedForSizing = sizerCoolingCapacity.size(state, TempSize, errorsFound);
-                    state.dataSize->DataFlowPerCoolingCapacity = state.dataSize->ZoneHVACSizing(zoneHVACIndex).MaxCoolAirVolFlow;
+                    state.dataSize->DataFlowPerCoolingCapacity = zoneHVACSizing.MaxCoolAirVolFlow;


Set the fraction of air flow here

rraustad · 2024-08-27T13:03:26Z

src/EnergyPlus/WindowAC.cc

                    sizingCoolingAirFlow.initializeWithinEP(state, CompType, CompName, PrintFlag, RoutineName);
-                    state.dataWindowAC->WindAC(WindACNum).MaxAirVolFlow = sizingCoolingAirFlow.size(state, TempSize, errorsFound);
+                    windowAC.MaxAirVolFlow = sizingCoolingAirFlow.size(state, TempSize, errorsFound);


And then size that new air flow rate here. You should also reset state.dataSize->DataFlowPerCoolingCapacity here to be a flow rate instead of a fraction.

Myoldmopar · 2024-09-10T18:01:06Z

Final thoughts here @jmarrec ? Looks like @rraustad suggested at least one change to reset the DataFlowPerCoolingCapacity variable.

rraustad · 2024-09-10T18:12:08Z

@jmarrec these global fraction variables are hard to get right. It may be correct now, just check to make sure the final scaled values are as expected.

jmarrec · 2024-09-12T10:24:16Z

For some reason, probably lack of understanding, I'm severely confused about what's being asked here.

Code linting and unit test aside, I haven't touched the sections that are being commented. The actual changes are https://github.com/NREL/EnergyPlus/pull/10673/files/5dbc7b13c8597788540474a075a5eab678a3ce12..a5d32dea2e5a7ea6c68c38b6f073176a9cdc9ce1

I've been looking at other files to see if I could figure out what may be different here compared to other objects

EnergyPlus/src/EnergyPlus/WindowAC.cc

Lines 977 to 1003 in a5d32de

    
           } else if (SAFMethod == FlowPerCoolingCapacity) { 
        
               SizingMethod = HVAC::CoolingCapacitySizing; 
        
               TempSize = AutoSize; 
        
               PrintFlag = false; 
        
               state.dataSize->DataScalableSizingON = true; 
        
               state.dataSize->DataFlowUsedForSizing = state.dataSize->FinalZoneSizing(state.dataSize->CurZoneEqNum).DesCoolVolFlow; 
        
               if (zoneHVACSizing.CoolingCapMethod == FractionOfAutosizedCoolingCapacity) { 
        
                   state.dataSize->DataFracOfAutosizedCoolingCapacity = zoneHVACSizing.ScaledCoolingCapacity; 
        
               } 
        
               bool errorsFound = false; 
        
               CoolingCapacitySizer sizerCoolingCapacity; 
        
               sizerCoolingCapacity.overrideSizingString(""); 
        
               sizerCoolingCapacity.initializeWithinEP(state, CompType, CompName, PrintFlag, RoutineName); 
        
               state.dataSize->DataCapacityUsedForSizing = sizerCoolingCapacity.size(state, TempSize, errorsFound); 
        
               state.dataSize->DataFlowPerCoolingCapacity = zoneHVACSizing.MaxCoolAirVolFlow; 
        
               PrintFlag = true; 
        
               TempSize = AutoSize; 
        
               errorsFound = false; 
        
               CoolingAirFlowSizer sizingCoolingAirFlow; 
        
               std::string stringOverride = "Maximum Supply Air Flow Rate [m3/s]"; 
        
               if (state.dataGlobal->isEpJSON) { 
        
                   stringOverride = "maximum_supply_air_flow_rate [m3/s]"; 
        
               } 
        
               sizingCoolingAirFlow.overrideSizingString(stringOverride); 
        
               // sizingCoolingAirFlow.setHVACSizingIndexData(windowAC.HVACSizingIndex); 
        
               sizingCoolingAirFlow.initializeWithinEP(state, CompType, CompName, PrintFlag, RoutineName); 
        
               windowAC.MaxAirVolFlow = sizingCoolingAirFlow.size(state, TempSize, errorsFound);

eg taking FanCoilUnits,

EnergyPlus/src/EnergyPlus/FanCoilUnits.cc

Lines 1294 to 1314 in a5d32de

    
           } else if (SAFMethod == DataSizing::FlowPerCoolingCapacity) { 
        
               SizingMethod = HVAC::CoolingCapacitySizing; 
        
               TempSize = DataSizing::AutoSize; 
        
               PrintFlag = false; 
        
               CoolingCapacitySizer sizerCoolingCapacity; 
        
               sizerCoolingCapacity.overrideSizingString(SizingString); 
        
               sizerCoolingCapacity.initializeWithinEP(state, CompType, CompName, PrintFlag, RoutineName); 
        
               state.dataSize->DataAutosizedCoolingCapacity = sizerCoolingCapacity.size(state, TempSize, ErrorsFound); 
        
               if (state.dataSize->ZoneHVACSizing(zoneHVACIndex).CoolingCapMethod == DataSizing::FractionOfAutosizedCoolingCapacity) { 
        
                   state.dataSize->DataFracOfAutosizedCoolingCapacity = state.dataSize->ZoneHVACSizing(zoneHVACIndex).ScaledCoolingCapacity; 
        
               } 
        
               state.dataSize->DataFlowPerCoolingCapacity = state.dataSize->ZoneHVACSizing(zoneHVACIndex).MaxCoolAirVolFlow; 
        
               PrintFlag = true; 
        
               TempSize = DataSizing::AutoSize; 
        
               state.dataSize->DataScalableSizingON = true; 
        
               CoolingAirFlowSizer sizingCoolingAirFlow; 
        
               sizingCoolingAirFlow.overrideSizingString(SizingString); 
        
               // sizingCoolingAirFlow.setHVACSizingIndexData(fanCoil.HVACSizingIndex); 
        
               sizingCoolingAirFlow.initializeWithinEP(state, CompType, CompName, PrintFlag, RoutineName); 
        
               CoolingAirVolFlowDes = sizingCoolingAirFlow.size(state, TempSize, ErrorsFound); 
        
           }

Rewritting a bit the code to miminize diffs:

--- WindowAC.blob.cc	2024-09-12 12:17:47.094657049 +0200
+++ FanCoilUnits.blob.cc	2024-09-12 12:18:03.988792981 +0200
@@ -2,22 +2,21 @@
                     SizingMethod = HVAC::CoolingCapacitySizing;
                     TempSize = DataSizing::AutoSize;
                     PrintFlag = false;
-                    state.dataSize->DataScalableSizingON = true;
-                    state.dataSize->DataFlowUsedForSizing = state.dataSize->FinalZoneSizing(state.dataSize->CurZoneEqNum).DesCoolVolFlow;
-                    if (zoneHVACSizing.CoolingCapMethod == FractionOfAutosizedCoolingCapacity) {
-                        state.dataSize->DataFracOfAutosizedCoolingCapacity = zoneHVACSizing.ScaledCoolingCapacity;
-                    }
                     bool errorsFound = false;
                     CoolingCapacitySizer sizerCoolingCapacity;
                     sizerCoolingCapacity.overrideSizingString("");
                     sizerCoolingCapacity.initializeWithinEP(state, CompType, CompName, PrintFlag, RoutineName);
-                    state.dataSize->DataCapacityUsedForSizing = sizerCoolingCapacity.size(state, TempSize, errorsFound);
+                    state.dataSize->DataAutosizedCoolingCapacity = sizerCoolingCapacity.size(state, TempSize, errorsFound);
+                    if (zoneHVACSizing.CoolingCapMethod == DataSizing::FractionOfAutosizedCoolingCapacity) {
+                        state.dataSize->DataFracOfAutosizedCoolingCapacity = zoneHVACSizing.ScaledCoolingCapacity;
+                    }
                     state.dataSize->DataFlowPerCoolingCapacity = zoneHVACSizing.MaxCoolAirVolFlow;
                     PrintFlag = true;
                     TempSize = DataSizing::AutoSize;
                     errorsFound = false;
+                    state.dataSize->DataScalableSizingON = true;
                     CoolingAirFlowSizer sizingCoolingAirFlow;
                     sizingCoolingAirFlow.overrideSizingString(SizingString);
                     sizingCoolingAirFlow.initializeWithinEP(state, CompType, CompName, PrintFlag, RoutineName);
-                    windowAC.MaxAirVolFlow = sizingCoolingAirFlow.size(state, TempSize, errorsFound);
+                    CoolingAirVolFlowDes = sizingCoolingAirFlow.size(state, TempSize, errorsFound);
                 }

nrel-bot-2c · 2024-10-10T00:19:40Z

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

jmarrec added Defect Includes code to repair a defect in EnergyPlus NotIDDChange Code does not impact IDD (can be merged after IO freeze) labels Aug 21, 2024

jmarrec self-assigned this Aug 21, 2024

jmarrec commented Aug 21, 2024

View reviewed changes

jmarrec added 6 commits August 21, 2024 10:35

Improve an existing unit test (I plan to use a variation of this)

9d0bef8

New unit test for #10663

dddaa5a

Take a reference directly

52ffb00

Revamp the routine to take more references to shorten the code, scope…

5dbc7b1

… the variables, initialize them, don't check 4 times if CurZoneEqNum is > 0

Fix existing logic error related to Cooling Capacity sizing

f472e96

Set CoolingAirFlow flag in WindowAC so fan is sized by the WindowAC

a5d32de

jmarrec force-pushed the 10663_WindowAC_FanSizing branch from ddc41c2 to a5d32de Compare August 21, 2024 08:36

jmarrec requested review from Myoldmopar and rraustad August 21, 2024 11:01

rraustad reviewed Aug 21, 2024

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jmarrec mentioned this pull request Aug 27, 2024

Coil:Cooling:DX:VariableSpeed should be converted to new sizing routines and respect DesignSpecification:ZoneHVAC:Sizing #10699

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rraustad reviewed Aug 27, 2024

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Myoldmopar added this to the EnergyPlus 25.1 IO Freeze milestone Sep 11, 2024

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Fix #10663 - Fan runtime fraction < 1 when flow rate scaling using DesignSpecification:ZoneHVAC:Sizing #10673

Fix #10663 - Fan runtime fraction < 1 when flow rate scaling using DesignSpecification:ZoneHVAC:Sizing #10673

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Myoldmopar commented Aug 21, 2024

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Myoldmopar commented Sep 10, 2024

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jmarrec commented Sep 12, 2024

nrel-bot-2c commented Oct 10, 2024

	} else if (this->zoneEqSizing(this->curZoneEqNum).CoolingAirFlow && !this->zoneEqSizing(this->curZoneEqNum).HeatingAirFlow) {
	this->autoSizedValue = this->dataFracOfAutosizedCoolingAirflow * this->zoneEqSizing(this->curZoneEqNum).CoolingAirVolFlow;

	if (this->zoneEqSizing(this->curZoneEqNum).CoolingAirFlow && !this->zoneEqSizing(this->curZoneEqNum).HeatingAirFlow) {
	this->autoSizedValue = this->zoneEqSizing(this->curZoneEqNum).CoolingAirVolFlow;

	CheckZoneSizing(state, format("COIL:{}{}", varSpeedCoil.CoolHeatType, CurrentObjSubfix), varSpeedCoil.Name);
	RatedAirVolFlowRateDes = max(state.dataSize->FinalZoneSizing(state.dataSize->CurZoneEqNum).DesCoolVolFlow,
	state.dataSize->FinalZoneSizing(state.dataSize->CurZoneEqNum).DesHeatVolFlow);

Fix #10663 - Fan runtime fraction < 1 when flow rate scaling using DesignSpecification:ZoneHVAC:Sizing #10673

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Fix #10663 - Fan runtime fraction < 1 when flow rate scaling using DesignSpecification:ZoneHVAC:Sizing #10673

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jmarrec commented Aug 21, 2024

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Myoldmopar commented Sep 10, 2024

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