Add misc appliances to panel load calc

[lixiliu]

Pull Request Description

Assign the following miscellaneous permanently connected appliances to homes for NEC panel load calculations:

• Microwave: 100% of homes, power level based on the number of occupants

  • Sizing (in cu ft) based on Whirlpool's microwave buying guide, then power is assigned to each cu ft class based on general search

    Occupants	Size (cu ft)	Power (W)
    0 - 2	0.5 - 0.9	900
    3 - 4	1.0 - 1.6	1100
    4+	1.7 - 2.2	1250

• Garbage disposal: 52% of homes (AHS 2013), power level based on the number of occupants

  • Power rating estimated based on average load amperage (x 120V), not horsepower rating as they appear to consume more power

  • Power rating based on InSinkErator product labels

  • Sizing based on Lowe's garbage disposal buying guide

    Occupants	Size (HP)	Avg Load (A)	Power (W)
    0 - 1	⅓	5.6	672
    2 - 3	½	6.3	756
    4 - 5	¾	9.5	1140
    5+	1	10.2	1224

• Garage door opener: assign one ½ HP if home has a garage, regardless of the number of garage

  • Power rating converted from horsepower rating at 1 mech HP = 745.7 W

@afontani @JLReyna - should this be based on occupants or bedrooms, is there a conversion between the two?

Related Pull Requests

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Related Issues

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Checklist

Required:

• Technical reference documentation has been updated
• Add to the changelog_dev.rst file
• No unexpected regression test changes on CI (comparison artifacts have been checked)

Optional (not all items may apply):

• Tests (and test files) have been updated
• Supporting resource files have been updated (related to resstock-estimation)
  • data dictionary
  • source report
  • options saturation
  • options_lookup
• openstudio tasks.rb update_measures has been run

[lixiliu]

@joseph-robertson - is this okay or do I need to define the condition as args[:geometry_unit_num_occupants] > 2 && args[:geometry_unit_num_occupants] <= 4?

[joseph-robertson]

Looks right to me.

Should Occupants=0 assign 900 W?

[lixiliu]

I think so. Microwave exists in unoccupied homes too.
I am also wondering if we should do this based on # of bedrooms instead. Is there a conversion we can use between occupants and bedrooms?

[joseph-robertson]

I had this built into OS-HPXML defaults: https://github.com/NREL/OpenStudio-HPXML/blob/electric_panel/HPXMLtoOpenStudio/resources/defaults.rb#L6128-L6130

But maybe it makes sense to do the assignment here instead.

[lixiliu]

Yeah, this is more of a ResStock assumption

[joseph-robertson]

Looks right to me.

Should Occupants=0 assign 900 W?

[JLReyna]

@lixiliu - in response to your question, the Occupants.tsv has a dependency on Bedrooms.tsv. I don't actually think we should have a dependency on either for garage doors. To have multiple openers (or differently sized openers), you'd be assuming some sort of factor driving the increase. I'd probably argue Geometry Floor Area if we were to choose something, but I don't think we know enough to develop that. Size of the garage (1 car, 2 car, 3 car) would be the clearest indicator, but even that doesn't mean increases in the opener. So long winded way to say I don't think this should have dependencies. @afontani do you agree?

[lixiliu]

@lixiliu - in response to your question, the Occupants.tsv has a dependency on Bedrooms.tsv. I don't actually think we should have a dependency on either for garage doors. To have multiple openers (or differently sized openers), you'd be assuming some sort of factor driving the increase. I'd probably argue Geometry Floor Area if we were to choose something, but I don't think we know enough to develop that. Size of the garage (1 car, 2 car, 3 car) would be the clearest indicator, but even that doesn't mean increases in the opener. So long winded way to say I don't think this should have dependencies. @afontani do you agree?

Thanks @JLReyna - and apologies for the confusion, the question is really for assigning microwave and garbage disposal, not garage door (and I completely agreed that there should not be a dependency to occupants there). There are market guidance on the sizing of microwave and garbage disposal based on household size, which I am using currently. But using occupants instead of bedrooms means we may have undersized equipment for vacant homes which have 0 occupants. So instead of using occupants directly, can we infer typical occupancy based on bedrooms and size based on that?