Hello,
Does anybody have to deal with section 9.6.3 from 90.1 - 2013 : "Additional interior lighting power using non-mandatory control"? I find it unclear ( it's pretty much the same section than section 9.6.2 c in the 2010 version).
It says that :
Additional Interior Lighting Power Allowance =
Lighting Power Under Control x Control Factor
1) I have a hard time to figure it out what is "Lighting Power Under Control", is it a power or a surface ?
According to section 9.6.3 it is a power: "the total input watts of all lamps being controlled" by specific control, but according to example 9-MM of 90.1 - 2013 User's Manual, it's much more the surface (in m2 or ft2) lighted by all lamps being controlled by specific control.
2) What is "Control Factors", a unitless factor or a LPD in W/m2 ?
According to section 9.6.3 it's a unitlessfactor, but according to example 9-MM of 90.1 - 2013 User's Manual, it's much more a LPD (see note).
3) In a theoretical
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A) Power allowance = (550 ft2 x 0.98 W/ft2) + (150 ft2 x 0.98 W/ft2 x 0.05) = 539 + 7.35 = 546.35 W
B) Power allowance = (550 ft2 x 0.98 W/ft2) + (180 W x 0.05) = 539 + 9 = 548 W
Note about example 9-MM of 90.1 - 2013 User's Manual: this example is full of mistakes.
? It refers to example 9-JJ instead of 9-LL
? The answer mentions an allowance without control of 450,000 W, so with a 500,000 ft2 open office that's mean a 0.90 W/ft2 LPD. But with the space-by-space method section 9.6.1 allows a 0.98 W/ft2 LPD, so the allowance without control should be 459,184 W
? The use of the control factors is unclear
Any help on that would be appreciated
Thanks,
Julien Dutel, ing., CEM, CMVP.
Direction des secteurs r?sidentiel, institutionnel et des affaires
Bureau de l'efficacit? et de l'innovation ?nerg?tiques
Minist?re des Ressources naturelles
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Qu?bec (Qu?bec) G1H 6R1
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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
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