[Bldg-sim] 90.1 - lighting - Additional interior lighting power using non-mandatory control

Mon Nov 23 10:17:32 PST 2015

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

On Mon, Nov 23, 2015 at 10:47 AM, <Julien.Dutel at mern.gouv.qc.ca> wrote:

> 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
> <https://www.google.ca/search?espv=2&biw=1219&bih=745&q=theoretical&spell=1&sa=X&ved=0ahUKEwiTzuDniafJAhVBkh4KHQD2AQsQBQgYKAA>
> example following section 9.6.3 of 90.1-2013 what should be the power
> allowance for an 550 ft2 open office in which there is a 150 ft2 with a
> manual diming control (Control Factor = 0.05 according to table 9.6.3 and
> maximum LPD for an open office is 0.98 W/ft2 LPD according to section
> 9.6.1) ? Is it answer A, B, or another one ?
>
> [image: 400 ft2 500 W installed ,150 ft2 180 W inst.]
>
>
>
>
>
>
>
>
>
>
>
> 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 résidentiel, institutionnel et des affaires
>
> Bureau de l'efficacité et de l'innovation énergétiques
>
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>
> 5700, 4e Avenue Ouest, B-406
>
> Québec (Québec)  G1H 6R1
>
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>
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>
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>
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>
>
>
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