Simulating energyplus with the BCVTB interface

Question

I have a openstudio model with 3 zones. We are using a python program to execute energyplus with the BCVTB interface. I got it to work on thermal zone 3 but not for thermal zone 1 and 2. I have the input variables defined in variables.cfg as: as:

<variable source="Ptolemy">
    <energyplus <EnergyPlus schedule="Cooling TZ2 Setpoint Schedule"/>
  </variable>
  <variable source="Ptolemy">
    <energyplus <EnergyPlus schedule="Heating TZ2 Setpoint Schedule"/>
  </variable></variable>

But when I run the execution I seem to get no load on the Air Loop for thermal zone 2. I have a plant loop for district heating and district cooling and then Air Loops thermal zone 2.

Could use some help with this.

The Osm and idf file can be found here: https://drive.google.com/file/d/1TM6LfmL8KI7w0XFswB9GMTH-KJQE5D-m/view?usp=share_link

Output from energyplus:

Program Version,EnergyPlus, Version 22.1.0-ed759b17ee, YMD=2022.12.20 10:42,
   ************* Beginning Zone Sizing Calculations
   ** Warning ** SetUpDesignDay: Entered DesignDay Barometric Pressure=31000 differs by more than 10% from Standard Barometric Pressure=100201.
   **   ~~~   ** ...occurs in DesignDay=SIZING PERIOD DESIGN DAY 1, Standard Pressure (based on elevation) will be used.
   ** Warning ** ProcessScheduleInput: Schedule:Compact="ZONE CONTROL TYPE SCHED TZ2", Schedule Type Limits Name="ANY NUMBER" not found -- will not be validated
   ** Warning ** ProcessScheduleInput: Schedule:Constant="ALWAYS OFF DISCRETE", Blank Schedule Type Limits Name input -- will not be validated.
   ** Warning ** ProcessScheduleInput: Schedule:Constant="ALWAYS ON CONTINUOUS", Blank Schedule Type Limits Name input -- will not be validated.
   ** Warning ** ProcessScheduleInput: Schedule:Constant="ALWAYS OFF DISCRETE 1", Blank Schedule Type Limits Name input -- will not be validated.
   ** Warning ** ProcessScheduleInput: Schedule:Constant="ALWAYS ON CONTINUOUS 1", Blank Schedule Type Limits Name input -- will not be validated.
   ** Warning ** GetHTSurfaceData: Surfaces with interface to Ground found but no "Ground Temperatures" were input.
   **   ~~~   ** Found first in surface=SURFACE 7
   **   ~~~   ** Defaults, constant throughout the year of (18.0) will be used.
   ** Warning ** CheckUsedConstructions: There are 6 nominally unused constructions in input.
   **   ~~~   ** For explicit details on each unused construction, use Output:Diagnostics,DisplayExtraWarnings;
   ** Warning ** Calculated design cooling load for zone=THERMAL ZONE 2 is zero.
   **   ~~~   ** Check Sizing:Zone and ZoneControl:Thermostat inputs.
   ** Warning ** Calculated design heating load for zone=THERMAL ZONE 2 is zero.
   **   ~~~   ** Check Sizing:Zone and ZoneControl:Thermostat inputs.
   ************* Beginning System Sizing Calculations
   ** Warning ** ManageSizing: Calculated Cooling Design Air Flow Rate for System=AIR LOOP CLG TZ2 is zero.
   **   ~~~   ** Check Sizing:Zone and ZoneControl:Thermostat inputs.
   ** Warning ** ManageSizing: Calculated Heating Design Air Flow Rate for System=AIR LOOP CLG TZ2 is zero.
   **   ~~~   ** Check Sizing:Zone and ZoneControl:Thermostat inputs.
   ** Warning ** ManageSizing: Calculated Cooling Design Air Flow Rate for System=AIR LOOP HTG TZ2 is zero.
   **   ~~~   ** Check Sizing:Zone and ZoneControl:Thermostat inputs.
   ** Warning ** ManageSizing: Calculated Heating Design Air Flow Rate for System=AIR LOOP HTG TZ2 is zero.
   **   ~~~   ** Check Sizing:Zone and ZoneControl:Thermostat inputs.
   ************* Beginning Plant Sizing Calculations
   ** Severe  ** SizeAirLoopBranches: AirLoopHVAC AIR LOOP CLG TZ2 has air flow less than 1.0000E-003 m3/s.
   **   ~~~   ** Primary air system volumetric flow rate = 0.0000 m3/s.
   **   ~~~   ** Check flow rate inputs for components in this air loop and,
   **   ~~~   ** if autosized, check Sizing:Zone and Sizing:System objects and related inputs.
   **  Fatal  ** Previous condition causes termination.
   ...Summary of Errors that led to program termination:
   ..... Reference severe error count=1
   ..... Last severe error=SizeAirLoopBranches: AirLoopHVAC AIR LOOP CLG TZ2 has air flow less than 1.0000E-003 m3/s.
   ************* Warning:  Node connection errors not checked - most system input has not been read (see previous warning).
   ************* Fatal error -- final processing.  Program exited before simulations began.  See previous error messages.
   *************
   ************* ===== Final Error Summary =====
   ************* The following error categories occurred.  Consider correcting or noting.
   ************* Nominally Unused Constructions
   ************* ..The nominally unused constructions warning is provided to alert you to potential conditions that can cause
   ************* ..extra time during simulation. Each construction is calculated by the algorithm indicated in the HeatBalanceAlgorithm
   ************* ..object. You may remove the constructions indicated (when you use the DisplayExtraWarnings option).
   *************
   ************* EnergyPlus Warmup Error Summary. During Warmup: 0 Warning; 0 Severe Errors.
   ************* EnergyPlus Sizing Error Summary. During Sizing: 14 Warning; 0 Severe Errors.
   ************* EnergyPlus Terminated--Fatal Error Detected. 14 Warning; 1 Severe Errors; Elapsed Time=00hr 00min  0.14sec

Thanks

I tried to run a simulation of the 3 thermal zones building using the BCVTB interface of energyplus. I expected the simulation to work since I defined the input variables in the variables.cfg file.

Simulating energyplus with the BCVTB interface

0 Answers0