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1 | initial version |
Hi Waseem,
I replied to your question on E+ yahoo group. Just in case you haven't seen it, I am adding my answer here as well.
I was recently involved in a study between De Montfort University, Salford University and ENSIMS which faced the same issue; how to calculate number of overheating hours (in addition to other overheating criteria outputs such as CEN15251) during occupied period from. I needed a code which can be applied to a large number of simulations and I decided to try to do it in EMS. You can see the piece of code which worked for me.
Regards,
Ivan Korolija
IESD, De Montfort University, Leicester, UK
! EMS code to calculate overheating hours
! EP Macro command to set threshold temperature (you can place it at the top of the imf file)
##set1 OHTempBed 25
! Get the operative temperature from the E+ output variables (This can be dry-bulb temperature too))
EnergyManagementSystem:Sensor,
BedOpTemp, !- Name
Bedroom, !- Output:Variable or Output:Meter Index Key Name
Zone Operative Temperature; !- Output:Variable or Output:Meter Name
! Get the occupancy schedule value to use as a reference when the room is occupied
EnergyManagementSystem:Sensor,
BedOcc, !- Name
Occupancy_Bedroom Sch, !- Output:Variable or Output:Meter Index Key Name
Schedule Value; !- Output:Variable or Output:Meter Name
! EMS programm
EnergyManagementSystem:ProgramCallingManager,
Overheating, !- Name
EndOfZoneTimestepBeforeZoneReporting, !- EnergyPlus Model Calling Point
OverheatingProg; !- Program Name 1
! If zone is occupied and temperature is above threshold, count for overheating hours
EnergyManagementSystem:Program,
OverheatingProg, !- Name
IF BedOcc > 0 && BedOpTemp > OHTempBed[],
SET BedOH = ZoneTimeStep, ! ZoneTimeStep is built in variable which is fraction of hour specified elswhere in the model (default value is 4 which is equal to 0.25 overheating hours)
ELSE,
SET BedOH = 0,
ENDIF;
EnergyManagementSystem:GlobalVariable,
BedOH;
EnergyManagementSystem:OutputVariable,
Bedroom Zones Overheating While Occupied, !- Name
BedOH, !- EMS Variable Name
Summed, !- Type of Data in Variable
ZoneTimestep; !- Update Frequency
Output:Variable,*,Bedroom Zones Overheating While Occupied,Annual;
2 | No.2 Revision |
Hi Waseem,
I replied to your question on E+ yahoo group. Just in case you haven't seen it, I am adding my answer here as well.
I was recently involved in a study between De Montfort University, Salford University and ENSIMS which faced the same issue; how to calculate number of overheating hours (in addition to other overheating criteria outputs such as CEN15251) during occupied period from. I needed a code which can be applied to a large number of simulations and I decided to try to do it in EMS. You can see the piece of code which worked for me.
Regards,
Ivan Korolija
IESD, De Montfort University, Leicester, UK
! EMS code to calculate overheating hours
! EP Macro command to set threshold temperature (you can place it at the top of the imf file)
##set1 OHTempBed 25
! Get the operative temperature from the E+ output variables (This can be dry-bulb temperature too))
EnergyManagementSystem:Sensor,
BedOpTemp, !- Name
Bedroom, !- Output:Variable or Output:Meter Index Key Name
Zone Operative Temperature; !- Output:Variable or Output:Meter Name
! Get the occupancy schedule value to use as a reference when the room is occupied
EnergyManagementSystem:Sensor,
BedOcc, !- Name
Occupancy_Bedroom Sch, !- Output:Variable or Output:Meter Index Key Name
Schedule Value; !- Output:Variable or Output:Meter Name
! EMS programm
EnergyManagementSystem:ProgramCallingManager,
Overheating, !- Name
EndOfZoneTimestepBeforeZoneReporting, !- EnergyPlus Model Calling Point
OverheatingProg; !- Program Name 1
! If zone is occupied and temperature is above threshold, count for overheating hours
EnergyManagementSystem:Program,
OverheatingProg, !- Name
IF BedOcc > 0 && BedOpTemp > OHTempBed[],
SET BedOH = ZoneTimeStep, ! ZoneTimeStep is built in variable which is fraction of hour specified elswhere in the model (default value is 4 which is equal to 0.25 overheating hours)
ELSE,
SET BedOH = 0,
ENDIF;
EnergyManagementSystem:GlobalVariable,
BedOH;
EnergyManagementSystem:OutputVariable,
Bedroom Zones Overheating While Occupied, !- Name
BedOH, !- EMS Variable Name
Summed, !- Type of Data in Variable
ZoneTimestep; !- Update Frequency
Output:Variable,*,Bedroom Zones Overheating While Occupied,Annual;
It should be possible to calculate PPD over 10% by using EMS. The code (which has to be validated :) )for PPD should be:
##set1 PPDBedThershold 10
EnergyManagementSystem:Sensor,
ActualBedPPD, !- Name
Bedroom, !- Output:Variable or Output:Meter Index Key Name
Zone Thermal Comfort Fanger Model PPD; !- Output:Variable or Output:Meter Name
! If you already defined occupancy sensor for the overheating hours, you should delete this one
EnergyManagementSystem:Sensor,
BedOcc, !- Name
Occupancy_Bedroom Sch, !- Output:Variable or Output:Meter Index Key Name
Schedule Value; !- Output:Variable or Output:Meter Name
EnergyManagementSystem:ProgramCallingManager,
PPD, !- Name
EndOfZoneTimestepBeforeZoneReporting, !- EnergyPlus Model Calling Point
PPDProg; !- Program Name 1
EnergyManagementSystem:Program,
PPDProg, !- Name
IF BedOcc > 0 && ActualBedPPD > PPDBedThershold[],
SET BedPPD = ZoneTimeStep,
ELSE,
SET BedPPD = 0,
ENDIF;
EnergyManagementSystem:GlobalVariable,
BedPPD;
EnergyManagementSystem:OutputVariable,
Bedroom Zones PPD Over 10 While Occupied, !- Name
BedPPD, !- EMS Variable Name
Summed, !- Type of Data in Variable
ZoneTimestep; !- Update Frequency
Output:Variable,*,Bedroom Zones PPD Over 10 While Occupied,Annual;