Electric panel

[joseph-robertson]

Pull Request Description

Support electric panel.

Related to: hpxmlwg/hpxml#420.

Checklist:

• Rename Watts under PanelLoad to something else; Power? Capacity? Decided on PowerRating.
• Move all system-prefixed arguments to panel-prefixed, so new electric_panel_xxx arguments section maps more directly to ElectricPanels HPXML section
• Make "Mech Vent" its own panel load type for ventilation fans (i.e., any load that can reference a system ID has its own load type)
• Create catchall argument for covering "Other" loads like garage door opener, garbage disposal, microwave (i.e., anything that doesn't reference a system ID)
• Handle the new backup_heating_capacity input for HPWH; assume no simultaneous operation and so take max(heating_capacity, backup_heating_capacity)? Can the 120V HPWH have backup?
• Default watts based on input capacity and not output capacity
  • Divide output capacity by seasonal COP (e.g., SEER, HSPF) or by rated COP (e.g., additional_properties.heat_rated_cops, additional_properties.cool_rated_cops)?
  • For HeatingSystem, CoolingSystem, HeatPump: add heating_input_capacity, cooling_input_capacity, and backup_heating_input_capacity methods to hpxml.rb
  • For WaterHeatingSystem: add heating_input_capacity and backup_heating_input_capacity methods to hpxml.rb (additional_properties.cop set by Waterheater.set_heat_pump_cop)
• Get alternative/better defaults:
  • Replace regressions:
    • Air handler / wall furnace fan: fan_watts_per_cfm * xxx_airflow_cfm?
    • Pump: electric_auxiliary_energy / 2.08?
  • Clothes dryer
    • How to determine HP or not? Let's just use vented/ventless as the switch -- probably the best option at this point in time.
  • Mechanical ventilation:
    • Use count and fan_power
    • Should local ventilation (i.e., kitchen and bath fans) really occupy at most 1 breaker space?
• Panel system addition logic
  • Use argument prefixes corresponding to upgrade options; too simple?
• Pool and permanent spa
  • There is no pump type arguments -- build measure defaults to Unknown; add new arguments?
• Separate arguments for controlling 83 and 87 outputs?
  • We may not want 87 for resstock -- can't we just ignore them?
• Comments/suggestions from Scott:
  • Meter-based total can change based on use of stochastic schedules and/or timestep.
  • Move HPXML class input capacity methods to HVAC resource file so they are only used for panel loads (and we can ignore fuel systems)
  • Electric panel should be opt-in using new build measure argument for panel scenario types.

      <PanelCalculationTypes>
        <Type>2023 load-based</Year>
        <Type>2026 load-based</Type>
        <Type>2023 meter-based</Type>
      </PanelCalculationTypes>

• Separate results_panel.csv (unit reporting?) which is output from translator measure and then overwritten (with Meter-based) from reporting measure. See results_design_load_details.csv as an example.

Checklist

Not all may apply:

• Schematron validator (EPvalidator.xml) has been updated
• Sample files have been added/updated (openstudio tasks.rb update_hpxmls)
• Tests have been added/updated (e.g., HPXMLtoOpenStudio/tests/test*.rb and/or workflow/tests/test*.rb)
• Documentation has been updated
• Changelog has been updated
• openstudio tasks.rb update_measures has been run
• No unexpected changes to simulation results of sample files

[jmaguire1]

@joseph-robertson: For HPWHs: yes, you can assume that there's not simultaneous operation of the elements and the HP, and just use the max value of the HP power and the backup power (which since it's an ER element is the same as the backup capacity).

120V HPWHs CAN have backup, but they also have to comply with the power limits of being 120V, so they're pretty small (~900W). AO Smith has backup elements; Rheem does not. The real advantage of having backup elements isn't that you can reheat faster, which is why 240V HPWHs have elements, but that it can run when the HP can't. So for example if you install in a garage in a warm climate, but a winter storm moves in and your garage is below the minimum temperature where the HP can run (~40 F), you can still get hot water. It's really mostly about making sure these units can still operate during rare cold events when installed in unconditioned spaces in warm climates.