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open229 / ruleset-model-description-schema

Developing a schema for ASHRAE Standard 229P.
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lighting power per area for interior lighting #112

Closed weilixu closed 2 years ago

weilixu commented 2 years ago

https://github.com/open229/ruleset-model-description-schema/blob/master/docs229/ASHRAE229.schema.json#L1153

It seems we only have power_per_area for defining lighting power density. In Table G3.7, atrium space lighting power is measured by per foot.

OSSTD has a way to convert it into power_per_area by estimating the height of the space. @mkarpman do we need to also include the logic of converting power per foot height to power per area to make sure the BEM vendor implements it correctly?

JasonGlazer commented 2 years ago

@weilixu weirdly those value in G3.7 are in (W/sqft)/ft. I really am not sure it makes sense to have a specific data element for this case. How about we just use Zone.volume/ sum(Space.floor_area) as a surrogate for height?

mkarpman commented 2 years ago

I agree. Alternatively, we can do "UNDERTERMINED" outcome for Atrium space types.

weilixu commented 2 years ago

@weilixu weirdly those value in G3.7 are in (W/sqft)/ft. I really am not sure it makes sense to have a specific data element for this case. How about we just use Zone.volume/ sum(Space.floor_area) as a surrogate for height?

Sorry for my super delayed reply to this issue. @JasonGlazer suggestion is exactly how we used in the RCT in the past two weeks. We created a ruleset specific function to calculate the average height of a zone by doing Zone.volume / sum(Space.floor_area). Thanks @JasonGlazer @mkarpman for your inputs.