Add misc appliances to panel load calc #1323
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| # Assume all homes have a microwave | ||
| if args[:geometry_unit_num_occupants] <= 2 | ||
| microwave_power = 900 # W, small, <= 0.9 cu ft | ||
| elsif args[:geometry_unit_num_occupants] <= 4 |
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@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?
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Looks right to me.
Should Occupants=0 assign 900 W?
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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?
| garage_door_power = 0 | ||
| else | ||
| # Assume one automatic door opener if has garage, regardless of no. garages | ||
| garage_door_power = 373 # W, 1/2 HP (1 mech HP = 745.7 W) |
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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.
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Yeah, this is more of a ResStock assumption
| # Assume all homes have a microwave | ||
| if args[:geometry_unit_num_occupants] <= 2 | ||
| microwave_power = 900 # W, small, <= 0.9 cu ft | ||
| elsif args[:geometry_unit_num_occupants] <= 4 |
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Looks right to me.
Should Occupants=0 assign 900 W?
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@lixiliu - in response to your question, the |
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? |
| garbage_disposal_power = 0 | ||
| else | ||
| # Power estimated from avg load amp not HP rating, from InSinkErators | ||
| if args[:geometry_unit_num_bedrooms] <= 1 |
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Note, this has been updated to vary based on bedrooms instead of occupants.
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
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
Garage door opener: assign one ½ HP if home has a garage, regardless of the number of garage
@afontani @JLReyna - should this be based on occupants or bedrooms, is there a conversion between the two?
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