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

Wed Feb 3 07:19:55 PST 2016

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.
Téléphone : 418 627-6379, poste 8060

De : Elizabeth Gillmor [mailto:elizabeth at energetics-eng.com]
Envoyé : 23 novembre 2015 13:18
À : 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<http://energetics-eng.com>
c 303.619.0091

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

[cid:image001.png at 01D15E6A.23660D50]

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
Ministère des Ressources naturelles
5700, 4e Avenue Ouest, B-406
Québec (Québec)  G1H 6R1
Téléphone : 418 627-6379<tel:418%20627-6379>, poste 8060
Téléphone sans frais : 1 877 727-6655<tel:1%20877%20727-6655>
Télécopieur : 418 643-5828<tel:418%20643-5828>
 http://www.efficaciteenergetique.mrn.gouv.qc.ca<http://www.efficaciteenergetique.mrn.gouv.qc.ca/>

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