Central HPWHs

[joseph-robertson]

Pull Request Description

# replacing in-unit electric heat pump WHs
$ /c/openstudio-3.7.0/bin/openstudio.exe workflow/run_analysis.rb -y project_testing/testing_baseline.yml -o -i 31

# replacing in-unit electric tank WHs
$ /c/openstudio-3.7.0/bin/openstudio.exe workflow/run_analysis.rb -y project_testing/testing_baseline.yml -o -i 66

# replacing in-unit gas tank WHs and boilers
$ /c/openstudio-3.7.0/bin/openstudio.exe workflow/run_analysis.rb -y project_testing/testing_baseline.yml -o -i 13

# ** Severe  ** Temperature (high) out of bounds [500.06] for zone="FURNACE AIRLOOP RET AIR ZONE", for surface="SURFACE 2"
$ /c/openstudio-3.7.0/bin/openstudio.exe workflow/run_analysis.rb -y project_national/national_baseline.yml -o -i 30

Use the BuildExistingModel (and ApplyUpgrade) meta measure to create HPXML files with (optionally) number of Building elements equal to the maximum of geometry_building_num_units and 5. All units (i.e., HPXML Building elements) are the same, except for stochastic schedules. The goals are to:

• have different stochastic schedules for each of the modeled units
• use unit multipliers (if geometry_building_num_units is greater than 5)
• divide building-level output by geometry_building_num_units downstream

Questions:

• Sizing / Balancing:
  • How do we determine how many HeatPumpAirToWaterFuelFiredHeating objects go on the supply side of the Heat Pump Loop?
  • Or do we handle this through tank size?
  • Is there some T24 resource here?
• What changes/additions do we need to make to this configuration to support a combi -type application? There is a third central "hydronic heating loop"? Does something on the demand side of recirc loop go on supply side of this new loop? Or maybe our "Heat Pump Loop" is already the "hydronic heating loop"? Update: It's not the latter. It's a third central "hydronic heating loop" much like the recirc loop (stratified tank of heat pump loop is supply side of heating loop), and demand side feeds unit baseboards. Need to look a simple boiler setup to get an idea of objects involved, etc.
• Should n_units be hpxml.buildings.size (i.e., what is actually modeled) or should it be the number of units in the actual buildings?
• How do we get l_bldg for the calculation of pipe supply/return length?
• There is a max of 1 recirculation loop per building, correct? (See "Recirculation Loop Living Story" in BEopt screenshot.)
• How to handle all the EMS stuff we remove (e.g., EC_adj, solar hw, etc.)?

Checklist

Not all may apply:

• [ ] Tests (and test files) have been updated
• [ ] Documentation has been updated
  • [ ] If related to resstock-estimation, checklist includes data dictionary, source report, options_lookup.
  • [ ] If changes to project_testing tsvs, checklist includes yml_precomputed, yml_precomputed_outdated, yml_precomputed_weight
• [ ] Changelog has been updated
• [ ] openstudio tasks.rb update_measures has been run
• [ ] No unexpected regression test changes on CI (checked comparison artifacts)

[joseph-robertson]

Currently seeing the following error, e.g., for national project's building ID=17:

   ** Severe  ** GetRuntimeLanguageUserInput: EnergyManagementSystem:OutputVariable="infil_flow_act_timeseries_outvar invalid field.
   **   ~~~   ** Invalid EMS Variable Name=INFIL_FLOW_ACT
   **   ~~~   ** EMS variable not found among local variables in UNIT1_INFIL_PROGRAM
   ** Severe  ** GetRuntimeLanguageUserInput: EnergyManagementSystem:OutputVariable="natural_vent_flow_act_timeseries_outvar invalid field.
   **   ~~~   ** Invalid EMS Variable Name=NATURAL_VENT_FLOW_ACT
   **   ~~~   ** EMS variable not found among local variables in UNIT1_NATURAL_VENT_PROGRAM
   ** Severe  ** GetRuntimeLanguageUserInput: EnergyManagementSystem:OutputVariable="whole_house_fan_flow_act_timeseries_outvar invalid field.
   **   ~~~   ** Invalid EMS Variable Name=WHOLE_HOUSE_FAN_FLOW_ACT
   **   ~~~   ** EMS variable not found among local variables in UNIT1_NATURAL_VENT_PROGRAM
   **  Fatal  ** Errors found in getting EMS Runtime Language input. Preceding condition causes termination.