Just for the record about this old topic, I just found by chance this IES article that confirm that (for the prescriptive method of compliance only):
1) ?Lighting Power Under Control? is the lighting power installed under control, and
2) ?Control Factors? is a unitless factor
3) the answer to the example is option b (see below).
http://www.ies.org/lda/HotTopics/LED/15.cfm
IES: ?For example, if manual continuous dimming is employed in a retail sales area, the control factor is 0.10, meaning if 1,000 watts of lighting is controlled by manual dimmers, 100 watts of additional lighting power is gained for use in the design anywhere in the building.?
As said Elizabeth, none of these results would be correct for Appendix G or code compliance energy modeling
Julien
Julien Dutel, ing., CEM, CMVP.
T?l?phone : 418 627-6379, poste 8060
De : Elizabeth Gillmor [mailto:elizabeth at energetics-eng.com]
Envoy? : 23 novembre 2015 13:18
? : Dutel, Julien (BEIE)
Cc : bldg-sim at lists.onebuilding.org
Objet : Re: [Bldg-sim] 90.1 - lighting - Additional interior lighting power using non-mandatory control
Lighting Power Under Control = the total lighting power (W) that is controlled by whatever control factor is applicable.
Control Factor is a unitless percentage. However, how you use it is going to depend on what protocol you are following. Appendix G and Energy Cost Budget Method both treat CF differently from the prescriptive code.
Prescriptive code uses Control Factor as an additional allowance to your baseline. Appendix G and Energy Cost Budget Method do not; instead you would have the option to either model controls directly (such as with daylighting controls), or to apply the Control Factor as a % LPD reduction to your Proposed Lighting Power Under Control (using only the watts controlled by that particular control strategy).
So if I was an electrical engineer filling out COMCheck for the prescriptive code, I would use Answer B above. But neither would be correct for Appendix G or code compliance energy modeling.
Cheers,
Elizabeth
Elizabeth Gillmor PE, BEMP, LC, LEED AP
e n e r g e t i c s consulting engineers, llc
energetics-eng.com
c 303.619.0091
