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So, it took me a while, but I did as David Goldwasser advised for my proposed building.

I took the original OS 1.14.0 model and exported an .IDF file from it and ran it with EP 8.6.0 Launch. Then I opened the OS 1.14.0 .OSM file in OS 2.2.0 and saved it as an OS 2.2.0 .OSM file. From that, I also exported an .IDF file and ran it with EP 8.7.0 Launch. In addition, I used the EP 8.7.0 Version Updater to convert the EP 8.6.0 .IDF file to an EP 8.7.0 .IDF file and ran that with EP 8.7.0 Launch (it had the same results as running the "native" EP 8.7.0 .IDF file).

The results for this proposed building are summarized below:

I also did this for a reference building, which is only different from the proposed building in that it has different constructions, has substantially fewer shading surfaces and that it uses parallel Fan-Powered Boxes (FPB) powered by Roof-Top Units (RTU) instead of simple VAV terminals powered by chilled water from an air-cooled chiller.

The results for this reference building are summarized below:

So the proposed building's performance depends on the version of EP, but the reference building's performance does not???

I am not sure what to make of this, but EP 8.7.0 seems to work differently from EP 8.6.0 for the proposed building (with many shading surfaces and chilled water VAV). Has the shading algorithm been altered between EP 8.6.0 and EP 8.7.0? I would think that is more likely than anything having changed with the treatment of chilled water or constructions?

Sorry, not really an answer, I know, but could not post this as a comment, either.

So, it took me a while, but I did as David Goldwasser advised for my proposed building.

I took the original OS 1.14.0 model and exported an .IDF file from it and ran it with EP 8.6.0 Launch. Then I opened the OS 1.14.0 .OSM file in OS 2.2.0 and saved it as an OS 2.2.0 .OSM file. From that, I also exported an .IDF file and ran it with EP 8.7.0 Launch. In addition, I used the EP 8.7.0 Version Updater to convert the EP 8.6.0 .IDF file to an EP 8.7.0 .IDF file and ran that with EP 8.7.0 Launch (it had the same results as running the "native" EP 8.7.0 .IDF file).

The results for this proposed building are summarized below:

I also did this for a reference building, which is only different from the proposed building in that it has different constructions, has substantially fewer shading surfaces and that it uses parallel Fan-Powered Boxes (FPB) powered by Roof-Top Units (RTU) instead of simple VAV terminals powered by chilled water from an air-cooled chiller.

The results for this reference building are summarized below:

So the proposed building's performance depends on the version of EP, but the reference building's performance does not???

I am not sure what to make of this, but EP 8.7.0 seems to work differently from EP 8.6.0 for the proposed building (with many shading surfaces and chilled water VAV). Has the shading algorithm been altered between EP 8.6.0 and EP 8.7.0? I would think that is more likely than anything having changed with the treatment of chilled water or constructions?

Sorry, not really an answer, I know, but could not post this as a comment, either.

,                        !- Temperature Capacity Multiplier
,                        !- Humidity Capacity Multiplier
,                        !- Carbon Dioxide Capacity Multiplier
;                        !- Generic Contaminant Capacity Multiplier

So, it took me a while, but I did as David Goldwasser advised for my proposed building.

I took the original OS 1.14.0 model and exported an .IDF file from it and ran it with EP 8.6.0 Launch. Then I opened the OS 1.14.0 .OSM file in OS 2.2.0 and saved it as an OS 2.2.0 .OSM file. From that, I also exported an .IDF file and ran it with EP 8.7.0 Launch. In addition, I used the EP 8.7.0 Version Updater to convert the EP 8.6.0 .IDF file to an EP 8.7.0 .IDF file and ran that with EP 8.7.0 Launch (it had the same results as running the "native" EP 8.7.0 .IDF file).

The results for this proposed building are summarized below:

I also did this for a reference building, which is only different from the proposed building in that it has different constructions, has substantially fewer shading surfaces and that it uses parallel Fan-Powered Boxes (FPB) powered by Roof-Top Units (RTU) instead of simple VAV terminals powered by chilled water from an air-cooled chiller.

The results for this reference building are summarized below:

So the proposed building's performance depends on the version of EP, but the reference building's performance does not???

I am not sure what to make of this, but EP 8.7.0 seems to work differently from EP 8.6.0 for the proposed building (with many shading surfaces and chilled water VAV). Has the shading algorithm been altered between EP 8.6.0 and EP 8.7.0? I would think that is more likely than anything having changed with the treatment of chilled water or constructions?

Sorry, not really an answer, I know, but could not post this as a comment, either.

>>> EDIT to accommodate Julien Marrec file comparison suggestion <<<

Thank you Julien. I followed your advice, and here is what I get for the Reference building – sorry for the lengthy listings.

To compare the OpenStudio 1.14.0 export to the OpenStudio 2.2.0 export, I did not need to sort. In general, almost all schedules had been given new hexadecimal numbers, though they were being referenced properly as far as I could tell. The only true differences appear to be the following.

A) Outdoor Air Specification

I think what I want is “Outdoor Air Schedule Name”, not “Outdoor Air Flow Rate Fraction Schedule Name”.

1.14.0 <verbatim> DesignSpecification:OutdoorAir, … 0, !- Outdoor Air Flow Air Changes per Hour {1/hr} FBCCTX Outdoor Air; !- Outdoor Air Flow Rate Fraction Schedule Name </verbatim>

2.2.0 <verbatim> DesignSpecification:OutdoorAir, … 0, !- Outdoor Air Flow Air Changes per Hour {1/hr} FBCCTX Outdoor Air; !- Outdoor Air Schedule Name </verbatim>

B) Research Special

Notice the two empty lines for 1.14.0.

1.14.0 <verbatim> ZoneCapacitanceMultiplier:ResearchSpecial,

, !- Temperature Capacity Multiplier , !- Humidity Capacity Multiplier , !- Carbon Dioxide Capacity Multiplier ; !- Generic Contaminant Capacity Multiplier </verbatim>

2.2.0 <verbatim> ZoneCapacitanceMultiplier:ResearchSpecial, {c3ceabe4-cf0a-48e8-91f5-2ffa47b0a18e}, !- Name , !- Zone or ZoneList Name , !- Temperature Capacity Multiplier , !- Humidity Capacity Multiplier , !- Carbon Dioxide Capacity Multiplier ; !- Generic Contaminant Capacity Multiplier </verbatim>

C) Plant Loop

Notice the "SingleSetpoint" entry for 2.2.0.

1.14.0 <verbatim> PlantLoop, … , !- Plant Loop Demand Calculation Scheme ; !- Common Pipe Simulation </verbatim>

2.2.0 <verbatim> PlantLoop, … SingleSetpoint, !- Plant Loop Demand Calculation Scheme ; !- Common Pipe Simulation </verbatim>

D) Hot Water Heater

Notice the addition of "IndirectHeatPrimarySetpoint" for 2.2.0.

1.14.0 <verbatim> WaterHeater:Mixed, … 1.5; !- Indirect Water Heating Recovery Time {hr} </verbatim>

2.2.0 <verbatim> WaterHeater:Mixed, … 1.5, !- Indirect Water Heating Recovery Time {hr} IndirectHeatPrimarySetpoint; !- Source Side Flow Control Mode </verbatim>

To compare the OpenStudio 1.14.0 export to its version conversion (8.6.0 to 8.7.0), I had to save both files “sorted” first, the 1.14.0 file from the 8.6.0 IDF Editor, the version-converted file from the 8.7.0 IDF Editor. Then the only difference I found was the following (again, notice the two empty lines for 1.14.0).

1.14.0 <verbatim> ZoneCapacitanceMultiplier:ResearchSpecial,

,                        !- Temperature Capacity Multiplier
,                        !- Humidity Capacity Multiplier
,                        !- Carbon Dioxide Capacity Multiplier
;                        !- Generic Contaminant Capacity Multiplier

</verbatim>

2.2.0 <verbatim> ZoneCapacitanceMultiplier:ResearchSpecial, Multiplier, !- Name , !- Zone or ZoneList Name , !- Temperature Capacity Multiplier , !- Humidity Capacity Multiplier , !- Carbon Dioxide Capacity Multiplier ; !- Generic Contaminant Capacity Multiplier </verbatim>

However, since both the OpenStudio 2.2.0 export and the 1.14.0 to 2.2.0 version conversion (via 8.7.0 IDF Version Updater) deliver the same results, I doubt that the above differences are relevant – other than the Research Special difference, perhaps, which appears in both approaches? When I make these comparisons, though, for the Proposed building, instead of the Reference building, I find the same discrepancies, yet the unmet hours of the Proposed building do not change, but the ones for the Reference building do. So, that makes me think that none of the observed discrepancies are relevant?

So, it took me a while, but I did as David Goldwasser advised for my proposed building.

I took the original OS 1.14.0 model and exported an .IDF file from it and ran it with EP 8.6.0 Launch. Then I opened the OS 1.14.0 .OSM file in OS 2.2.0 and saved it as an OS 2.2.0 .OSM file. From that, I also exported an .IDF file and ran it with EP 8.7.0 Launch. In addition, I used the EP 8.7.0 Version Updater to convert the EP 8.6.0 .IDF file to an EP 8.7.0 .IDF file and ran that with EP 8.7.0 Launch (it had the same results as running the "native" EP 8.7.0 .IDF file).

The results for this proposed building are summarized below:

I also did this for a reference building, which is only different from the proposed building in that it has different constructions, has substantially fewer shading surfaces and that it uses parallel Fan-Powered Boxes (FPB) powered by Roof-Top Units (RTU) instead of simple VAV terminals powered by chilled water from an air-cooled chiller.

The results for this reference building are summarized below:

So the proposed building's performance depends on the version of EP, but the reference building's performance does not???

I am not sure what to make of this, but EP 8.7.0 seems to work differently from EP 8.6.0 for the proposed building (with many shading surfaces and chilled water VAV). Has the shading algorithm been altered between EP 8.6.0 and EP 8.7.0? I would think that is more likely than anything having changed with the treatment of chilled water or constructions?

Sorry, not really an answer, I know, but could not post this as a comment, either.

>>> EDIT to accommodate Julien Marrec file comparison suggestion <<<

Thank you Julien. I followed your advice, and here is what I get for the Reference building – sorry for the lengthy listings.

To compare the OpenStudio 1.14.0 export to the OpenStudio 2.2.0 export, I did not need to sort. In general, almost all schedules had been given new hexadecimal numbers, though they were being referenced properly as far as I could tell. The only true differences appear to be the following.

A) Outdoor Air Specification

I think what I want is “Outdoor Air Schedule Name”, not “Outdoor Air Flow Rate Fraction Schedule Name”.

1.14.0 <verbatim> DesignSpecification:OutdoorAir, … 0, !- Outdoor Air Flow Air Changes per Hour {1/hr} FBCCTX Outdoor Air; !- Outdoor Air Flow Rate Fraction Schedule Name </verbatim>

2.2.0 <verbatim> DesignSpecification:OutdoorAir, … 0, !- Outdoor Air Flow Air Changes per Hour {1/hr} FBCCTX Outdoor Air; !- Outdoor Air Schedule Name </verbatim>

B) Research Special

Notice the two empty lines for 1.14.0.

1.14.0 <verbatim> ZoneCapacitanceMultiplier:ResearchSpecial,

, !- Temperature Capacity Multiplier , !- Humidity Capacity Multiplier , !- Carbon Dioxide Capacity Multiplier ; !- Generic Contaminant Capacity Multiplier </verbatim>

2.2.0 <verbatim> ZoneCapacitanceMultiplier:ResearchSpecial, {c3ceabe4-cf0a-48e8-91f5-2ffa47b0a18e}, !- Name , !- Zone or ZoneList Name , !- Temperature Capacity Multiplier , !- Humidity Capacity Multiplier , !- Carbon Dioxide Capacity Multiplier ; !- Generic Contaminant Capacity Multiplier </verbatim>

C) Plant Loop

Notice the "SingleSetpoint" entry for 2.2.0.

1.14.0 <verbatim> PlantLoop, … , !- Plant Loop Demand Calculation Scheme ; !- Common Pipe Simulation </verbatim>

2.2.0 <verbatim> PlantLoop, … SingleSetpoint, !- Plant Loop Demand Calculation Scheme ; !- Common Pipe Simulation </verbatim>

D) Hot Water Heater

Notice the addition of "IndirectHeatPrimarySetpoint" for 2.2.0.

1.14.0 <verbatim> WaterHeater:Mixed, … 1.5; !- Indirect Water Heating Recovery Time {hr} </verbatim>

2.2.0 <verbatim> WaterHeater:Mixed, … 1.5, !- Indirect Water Heating Recovery Time {hr} IndirectHeatPrimarySetpoint; !- Source Side Flow Control Mode </verbatim>

To compare the OpenStudio 1.14.0 export to its version conversion (8.6.0 to 8.7.0), I had to save both files “sorted” first, the 1.14.0 file from the 8.6.0 IDF Editor, the version-converted file from the 8.7.0 IDF Editor. Then the only difference I found was the following (again, notice the two empty lines for 1.14.0).

1.14.0 <verbatim> ZoneCapacitanceMultiplier:ResearchSpecial,

 
,                        !- Temperature Capacity Multiplier
 ,                        !- Humidity Capacity Multiplier
 ,                        !- Carbon Dioxide Capacity Multiplier
 ;                        !- Generic Contaminant Capacity Multiplier

</verbatim>

2.2.0 <verbatim> ZoneCapacitanceMultiplier:ResearchSpecial, Multiplier, !- Name , !- Zone or ZoneList Name , !- Temperature Capacity Multiplier , !- Humidity Capacity Multiplier , !- Carbon Dioxide Capacity Multiplier ; !- Generic Contaminant Capacity Multiplier </verbatim>

However, since both the OpenStudio 2.2.0 export and the 1.14.0 to 2.2.0 version conversion (via 8.7.0 IDF Version Updater) deliver the same results, I doubt that the above differences are relevant – other than the Research Special difference, perhaps, which appears in both approaches? When I make these comparisons, though, for the Proposed building, instead of the Reference building, I find the same discrepancies, yet the unmet hours of the Proposed building do not change, but the ones for the Reference building do. So, that makes me think that none of the observed discrepancies are relevant?

So, it took me a while, but I did as David Goldwasser advised for my proposed building.

I took the original OS 1.14.0 model and exported an .IDF file from it and ran it with EP 8.6.0 Launch. Then I opened the OS 1.14.0 .OSM file in OS 2.2.0 and saved it as an OS 2.2.0 .OSM file. From that, I also exported an .IDF file and ran it with EP 8.7.0 Launch. In addition, I used the EP 8.7.0 Version Updater to convert the EP 8.6.0 .IDF file to an EP 8.7.0 .IDF file and ran that with EP 8.7.0 Launch (it had the same results as running the "native" EP 8.7.0 .IDF file).

The results for this proposed building are summarized below:

I also did this for a reference building, which is only different from the proposed building in that it has different constructions, has substantially fewer shading surfaces and that it uses parallel Fan-Powered Boxes (FPB) powered by Roof-Top Units (RTU) instead of simple VAV terminals powered by chilled water from an air-cooled chiller.

The results for this reference building are summarized below:

So the proposed building's performance depends on the version of EP, but the reference building's performance does not???

I am not sure what to make of this, but EP 8.7.0 seems to work differently from EP 8.6.0 for the proposed building (with many shading surfaces and chilled water VAV). Has the shading algorithm been altered between EP 8.6.0 and EP 8.7.0? I would think that is more likely than anything having changed with the treatment of chilled water or constructions?

Sorry, not really an answer, I know, but could not post this as a comment, either.

>>> EDIT to accommodate Julien Marrec file comparison suggestion <<<

Thank you Julien. I followed your advice, and here is what I get for the Reference building – sorry for the lengthy listings.

To compare the OpenStudio 1.14.0 export to the OpenStudio 2.2.0 export, I did not need to sort. In general, almost all schedules had been given new hexadecimal numbers, though they were being referenced properly as far as I could tell. The only true differences appear to be the following.

A) Outdoor Air Specification

I think what I want is “Outdoor Air Schedule Name”, not “Outdoor Air Flow Rate Fraction Schedule Name”.

1.14.0 1.14.0

 DesignSpecification:OutdoorAir,
…
  0,                                      !- Outdoor Air Flow Air Changes per Hour {1/hr}
  FBCCTX Outdoor Air;                     !- Outdoor Air Flow Rate Fraction Schedule Name
 
2.2.0

2.2.0

 DesignSpecification:OutdoorAir,
…
  0,                                      !- Outdoor Air Flow Air Changes per Hour {1/hr}
  FBCCTX Outdoor Air;                     !- Outdoor Air Schedule Name

B) Research Special

Notice the two empty lines for 1.14.0.

1.14.0 1.14.0

ZoneCapacitanceMultiplier:ResearchSpecial,
 
ZoneCapacitanceMultiplier:ResearchSpecial,


  ,                                       !- Temperature Capacity Multiplier
  ,                                       !- Humidity Capacity Multiplier
  ,                                       !- Carbon Dioxide Capacity Multiplier
  ;                                       !- Generic Contaminant Capacity Multiplier
 
2.2.0

2.2.0

 ZoneCapacitanceMultiplier:ResearchSpecial,
  {c3ceabe4-cf0a-48e8-91f5-2ffa47b0a18e}, !- Name
  ,                                       !- Zone or ZoneList Name
  ,                                       !- Temperature Capacity Multiplier
  ,                                       !- Humidity Capacity Multiplier
  ,                                       !- Carbon Dioxide Capacity Multiplier
  ;                                       !- Generic Contaminant Capacity Multiplier

C) Plant Loop

Notice the "SingleSetpoint" entry for 2.2.0.

1.14.0 1.14.0

 PlantLoop,
…
  ,                                       !- Plant Loop Demand Calculation Scheme
  ;                                       !- Common Pipe Simulation
 
2.2.0

2.2.0

 PlantLoop,
…
  SingleSetpoint,                         !- Plant Loop Demand Calculation Scheme
  ;                                       !- Common Pipe Simulation

D) Hot Water Heater

Notice the addition of "IndirectHeatPrimarySetpoint" for 2.2.0.

1.14.0 1.14.0

 WaterHeater:Mixed,
…
  1.5;                                    !- Indirect Water Heating Recovery Time {hr}
 
 
2.2.0

2.2.0

 WaterHeater:Mixed,
…
  1.5,                                    !- Indirect Water Heating Recovery Time {hr}
  IndirectHeatPrimarySetpoint;            !- Source Side Flow Control Mode

To compare the OpenStudio 1.14.0 export to its version conversion (8.6.0 to 8.7.0), I had to save both files “sorted” first, the 1.14.0 file from the 8.6.0 IDF Editor, the version-converted file from the 8.7.0 IDF Editor. Then the only difference I found was the following (again, notice the two empty lines for 1.14.0).

1.14.0 1.14.0

ZoneCapacitanceMultiplier:ResearchSpecial,
 
ZoneCapacitanceMultiplier:ResearchSpecial,


    ,                        !- Temperature Capacity Multiplier
    ,                        !- Humidity Capacity Multiplier
    ,                        !- Carbon Dioxide Capacity Multiplier
    ;                        !- Generic Contaminant Capacity Multiplier
 
2.2.0

2.2.0

 ZoneCapacitanceMultiplier:ResearchSpecial,
    Multiplier,              !- Name
    ,                        !- Zone or ZoneList Name
    ,                        !- Temperature Capacity Multiplier
    ,                        !- Humidity Capacity Multiplier
    ,                        !- Carbon Dioxide Capacity Multiplier
    ;                        !- Generic Contaminant Capacity Multiplier

However, since both the OpenStudio 2.2.0 export and the 1.14.0 to 2.2.0 version conversion (via 8.7.0 IDF Version Updater) deliver the same results, I doubt that the above differences are relevant – other than the Research Special difference, perhaps, which appears in both approaches? When I make these comparisons, though, for the Proposed building, instead of the Reference building, I find the same discrepancies, yet the unmet hours of the Proposed building do not change, but the ones for the Reference building do. So, that makes me think that none of the observed discrepancies are relevant?

So, it took me a while, but I did as David Goldwasser advised for my proposed building.

I took the original OS 1.14.0 model and exported an .IDF file from it and ran it with EP 8.6.0 Launch. Then I opened the OS 1.14.0 .OSM file in OS 2.2.0 and saved it as an OS 2.2.0 .OSM file. From that, I also exported an .IDF file and ran it with EP 8.7.0 Launch. In addition, I used the EP 8.7.0 Version Updater to convert the EP 8.6.0 .IDF file to an EP 8.7.0 .IDF file and ran that with EP 8.7.0 Launch (it had the same results as running the "native" EP 8.7.0 .IDF file).

The results for this proposed building are summarized below:

I also did this for a reference building, which is only different from the proposed building in that it has different constructions, has substantially fewer shading surfaces and that it uses parallel Fan-Powered Boxes (FPB) powered by Roof-Top Units (RTU) instead of simple VAV terminals powered by chilled water from an air-cooled chiller.

The results for this reference building are summarized below:

So the proposed building's performance depends on the version of EP, but the reference building's performance does not???

I am not sure what to make of this, but EP 8.7.0 seems to work differently from EP 8.6.0 for the proposed building (with many shading surfaces and chilled water VAV). Has the shading algorithm been altered between EP 8.6.0 and EP 8.7.0? I would think that is more likely than anything having changed with the treatment of chilled water or constructions?

Sorry, not really an answer, I know, but could not post this as a comment, either.

>>> EDIT to accommodate Julien Marrec file comparison suggestion <<<

Thank you Julien. I followed your advice, and here is what I get for the Reference building – sorry for the lengthy listings.

To compare the OpenStudio 1.14.0 export to the OpenStudio 2.2.0 export, I did not need to sort. In general, almost all schedules had been given new hexadecimal numbers, though they were being referenced properly as far as I could tell. The only true differences appear to be the following.

A) Outdoor Air Specification

I think what I want is “Outdoor Air Schedule Name”, not “Outdoor Air Flow Rate Fraction Schedule Name”.

1.14.0

DesignSpecification:OutdoorAir,
…
  0,                                      !- Outdoor Air Flow Air Changes per Hour {1/hr}
  FBCCTX Outdoor Air;                     !- Outdoor Air Flow Rate Fraction Schedule Name

2.2.0

DesignSpecification:OutdoorAir,
…
  0,                                      !- Outdoor Air Flow Air Changes per Hour {1/hr}
  FBCCTX Outdoor Air;                     !- Outdoor Air Schedule Name

B) Research Special

Notice the two empty lines for 1.14.0.

1.14.0

ZoneCapacitanceMultiplier:ResearchSpecial,


  ,                                       !- Temperature Capacity Multiplier
  ,                                       !- Humidity Capacity Multiplier
  ,                                       !- Carbon Dioxide Capacity Multiplier
  ;                                       !- Generic Contaminant Capacity Multiplier

2.2.0

ZoneCapacitanceMultiplier:ResearchSpecial,
  {c3ceabe4-cf0a-48e8-91f5-2ffa47b0a18e}, !- Name
  ,                                       !- Zone or ZoneList Name
  ,                                       !- Temperature Capacity Multiplier
  ,                                       !- Humidity Capacity Multiplier
  ,                                       !- Carbon Dioxide Capacity Multiplier
  ;                                       !- Generic Contaminant Capacity Multiplier

C) Plant Loop

Notice the "SingleSetpoint" entry for 2.2.0.

1.14.0

PlantLoop,
…
  ,                                       !- Plant Loop Demand Calculation Scheme
  ;                                       !- Common Pipe Simulation

2.2.0

PlantLoop,
…
  SingleSetpoint,                         !- Plant Loop Demand Calculation Scheme
  ;                                       !- Common Pipe Simulation

D) Hot Water Heater

Notice the addition of "IndirectHeatPrimarySetpoint" for 2.2.0.

1.14.0

WaterHeater:Mixed,
…
  1.5;                                    !- Indirect Water Heating Recovery Time {hr}

2.2.0

WaterHeater:Mixed,
…
  1.5,                                    !- Indirect Water Heating Recovery Time {hr}
  IndirectHeatPrimarySetpoint;            !- Source Side Flow Control Mode

To compare the OpenStudio 1.14.0 export to its version conversion (8.6.0 to 8.7.0), I had to save both files “sorted” first, the 1.14.0 file from the 8.6.0 IDF Editor, the version-converted file from the 8.7.0 IDF Editor. Then the only difference I found was the following (again, notice the two empty lines for 1.14.0).

1.14.0

ZoneCapacitanceMultiplier:ResearchSpecial,


    ,                        !- Temperature Capacity Multiplier
    ,                        !- Humidity Capacity Multiplier
    ,                        !- Carbon Dioxide Capacity Multiplier
    ;                        !- Generic Contaminant Capacity Multiplier

2.2.0

ZoneCapacitanceMultiplier:ResearchSpecial,
    Multiplier,              !- Name
    ,                        !- Zone or ZoneList Name
    ,                        !- Temperature Capacity Multiplier
    ,                        !- Humidity Capacity Multiplier
    ,                        !- Carbon Dioxide Capacity Multiplier
    ;                        !- Generic Contaminant Capacity Multiplier

However, since both the OpenStudio 2.2.0 export and the 1.14.0 to 2.2.0 version conversion (via 8.7.0 IDF Version Updater) deliver the same results, I doubt that the above differences are relevant – other than the Research Special difference, perhaps, which appears in both approaches? When I make these comparisons, though, for the Proposed building, instead of the Reference building, I find the same discrepancies, yet the unmet hours of the Proposed building do not change, but the ones for the Reference building do. So, that makes me think that none of the observed discrepancies are relevant?

So, it took me a while, but I did as David Goldwasser advised for my proposed building.

I took the original OS 1.14.0 model and exported an .IDF file from it and ran it with EP 8.6.0 Launch. Then I opened the OS 1.14.0 .OSM file in OS 2.2.0 and saved it as an OS 2.2.0 .OSM file. From that, I also exported an .IDF file and ran it with EP 8.7.0 Launch. In addition, I used the EP 8.7.0 Version Updater to convert the EP 8.6.0 .IDF file to an EP 8.7.0 .IDF file and ran that with EP 8.7.0 Launch (it had the same results as running the "native" EP 8.7.0 .IDF file).

The results for this proposed building are summarized below:

I also did this for a reference building, which is only different from the proposed building in that it has different constructions, has substantially fewer shading surfaces and that it uses parallel Fan-Powered Boxes (FPB) powered by Roof-Top Units (RTU) instead of simple VAV terminals powered by chilled water from an air-cooled chiller.

The results for this reference building are summarized below:

So the proposed building's performance depends on the version of EP, but the reference building's performance does not???

I am not sure what to make of this, but EP 8.7.0 seems to work differently from EP 8.6.0 for the proposed building (with many shading surfaces and chilled water VAV). Has the shading algorithm been altered between EP 8.6.0 and EP 8.7.0? I would think that is more likely than anything having changed with the treatment of chilled water or constructions?

Sorry, not really an answer, I know, but could not post this as a comment, either.

>>> EDIT to accommodate Julien Marrec file comparison suggestion <<<

Thank you Julien. I followed your advice, and here is what I get for the Reference building – sorry for the lengthy listings.

To compare the OpenStudio 1.14.0 export to the OpenStudio 2.2.0 export, I did not need to sort. In general, almost all schedules had been given new hexadecimal numbers, though they were being referenced properly as far as I could tell. The only true differences appear to be the following.

A) Outdoor Air Specification

I think what I want is “Outdoor Air Schedule Name”, not “Outdoor Air Flow Rate Fraction Schedule Name”.

1.14.0

DesignSpecification:OutdoorAir,
…
  0,                                      !- Outdoor Air Flow Air Changes per Hour {1/hr}
  FBCCTX Outdoor Air;                     !- Outdoor Air Flow Rate Fraction Schedule Name

2.2.0

DesignSpecification:OutdoorAir,
…
  0,                                      !- Outdoor Air Flow Air Changes per Hour {1/hr}
  FBCCTX Outdoor Air;                     !- Outdoor Air Schedule Name

B) Research Special

Notice the two empty lines for 1.14.0.

1.14.0

ZoneCapacitanceMultiplier:ResearchSpecial,


  ,                                       !- Temperature Capacity Multiplier
  ,                                       !- Humidity Capacity Multiplier
  ,                                       !- Carbon Dioxide Capacity Multiplier
  ;                                       !- Generic Contaminant Capacity Multiplier

2.2.0

ZoneCapacitanceMultiplier:ResearchSpecial,
  {c3ceabe4-cf0a-48e8-91f5-2ffa47b0a18e}, !- Name
  ,                                       !- Zone or ZoneList Name
  ,                                       !- Temperature Capacity Multiplier
  ,                                       !- Humidity Capacity Multiplier
  ,                                       !- Carbon Dioxide Capacity Multiplier
  ;                                       !- Generic Contaminant Capacity Multiplier

C) Plant Loop

Notice the "SingleSetpoint" entry for 2.2.0.

1.14.0

PlantLoop,
…
  ,                                       !- Plant Loop Demand Calculation Scheme
  ;                                       !- Common Pipe Simulation

2.2.0

PlantLoop,
…
  SingleSetpoint,                         !- Plant Loop Demand Calculation Scheme
  ;                                       !- Common Pipe Simulation

D) Hot Water Heater

Notice the addition of "IndirectHeatPrimarySetpoint" for 2.2.0.

1.14.0

WaterHeater:Mixed,
…
  1.5;                                    !- Indirect Water Heating Recovery Time {hr}

2.2.0

WaterHeater:Mixed,
…
  1.5,                                    !- Indirect Water Heating Recovery Time {hr}
  IndirectHeatPrimarySetpoint;            !- Source Side Flow Control Mode

To compare the OpenStudio 1.14.0 export to its version conversion (8.6.0 to 8.7.0), I had to save both files “sorted” first, the 1.14.0 file from the 8.6.0 IDF Editor, the version-converted file from the 8.7.0 IDF Editor. Then the only difference I found was the following (again, notice the two empty lines for 1.14.0).

1.14.0

ZoneCapacitanceMultiplier:ResearchSpecial,


    ,                        !- Temperature Capacity Multiplier
    ,                        !- Humidity Capacity Multiplier
    ,                        !- Carbon Dioxide Capacity Multiplier
    ;                        !- Generic Contaminant Capacity Multiplier

2.2.0

ZoneCapacitanceMultiplier:ResearchSpecial,
    Multiplier,              !- Name
    ,                        !- Zone or ZoneList Name
    ,                        !- Temperature Capacity Multiplier
    ,                        !- Humidity Capacity Multiplier
    ,                        !- Carbon Dioxide Capacity Multiplier
    ;                        !- Generic Contaminant Capacity Multiplier

However, since both the OpenStudio 2.2.0 export and the 1.14.0 to 2.2.0 version conversion (via 8.7.0 IDF Version Updater) deliver the same results, I doubt that the above differences are relevant – other than the Research Special difference, perhaps, which appears in both approaches? When I make these comparisons, though, for the Proposed building, instead of the Reference building, I find the same discrepancies, yet the unmet hours of the Proposed building do not change, but the ones for the Reference building do. So, that makes me think that none of the observed discrepancies are relevant?

EDIT to show some interesting temperature and flow rate discrepancies between 1.14.0 and 2.2.0 <<<

OK, at the danger of possibly overstaying my welcome on this question, I did take the liberty to make a deeper level comparison. For the 1.14.0 and the 2.2.0 runs, I created plots of mixed air and outdoor air vs. time for one of the air handling units as well as setpoint and temperature vs. time for one of the thermal zones. There are some VERY stark differences between 1.14.0 and 2.2.0 - using the SAME 1.14.0 .OSM file, just opened in 2.2.0 and re-saved.

A) Mixed Air and Outdoor Air

vs.

B) Cooling and Heating Setpoint and Temperature

vs.

It should be noted that at the same time, both the 1.14.0 and the 2.2.0 file have the SAME "Component Sizing Summary" and "Equipment Summary" reports! It is almost as if the 1.14.0 run uses the equipment sized thus in a correct manner, while the 2.2.0 run uses the SAME sized equipment in a manner that does not allow it to meet setpoint in the period observed (and other periods), so it is no wonder that the unmet cooling hours are high for the 2.2.0 run.