[Bldg-sim] LEED Canada CS - What to use for Plug Load Density

Aaron Smith asmith at mreng.ca
Tue Sep 11 19:15:27 PDT 2012


Aaron, thanks for bringing it to my attention that the USGBC has the same
table in Appendix 2.  The difference in the Canadian version of CS is that
there is no requirement for Process energy to be 25% of the baseline energy
cost.  In my case total process and plug loads are currently at 24% of the
design building but only 10% of the Baseline building.  

 

I¡¯ll let you know if we send in a CIR but I think the 25% requirement would
override everything for your and as you say it might not hold up with the
USGBC anyways.

 

Aaron

 

 

Aaron Smith, P.Eng 

LEED(r) AP BD+C, M-ASHRAE, Mechanical Engineer



t: (902) 422-7393

f: (902) 423-4945

e:  <mailto:asmith at mreng.ca> asmith at mreng.ca

 

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From: Dahlstrom, Aaron [mailto:ADahlstrom at in-posse.com] 
Sent: Tuesday, September 11, 2012 11:24 AM
To: º«ÐÇ; Aaron Smith
Cc: bldg-sim at lists.onebuilding.org
Subject: RE: [Bldg-sim] LEED Canada CS - What to use for Plug Load Density

 

Aaron ¨C 

 

I¡¯ve seen both approaches used, since both are cited in the reference
manual.

 

In my opinion, some developers may allocate 1.5 W/sf or more to tenants, but
if fit out by typical office tenants, something like 0.75 W/sf is closer to
the ASHRAE Fundamentals ¡°light / medium¡± loads (p18.13 of Fundamentals
2009). Further, the ASHRAE numbers were developed for peak cooling load
calculations, not operating averages, so there is likely some additional
diversity in operation which should tend to lower these numbers. Also, since
I¡¯m often modeling using schedules from ASHRAE¡¯s User Manual, a case could
be made that it is better to use ASHRAE¡¯s tenant plug load numbers to be
consistent.

 

Generally, even when I¡¯m using the higher Core and Shell Appendix 2
numbers, I model elevators separately/explicitly, since Appendix 2 calls the
numbers ¡°tenant receptacle loads.¡±

 

If you do send in a CIR and get a response, please let me know! 

 

(caveat ¨C I¡¯m US-based, not sure if there are variances due to
Canada-specific research / codes.)

 

Aaron

 

Aaron Dahlstrom , PE, LEED(r) AP

In Posse ¨C A subsidiary of AKF| 1500 Walnut Street, Suite 1414,
Philadelphia, PA 19102 

d: 215-282-6753| m: | In Posse: 215-282-6800| AKF: 215-735-7290

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<http://www.akfgroup.com/> 

 

 

 

From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.
onebuilding.org] On Behalf Of ??
Sent: Monday, September 10, 2012 11:33 PM
To: Aaron Smith
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] LEED Canada CS - What to use for Plug Load Density

 

Hi Aaron,

 

Is it LEED project? If so, in my opinion, if the process energy accounts for
no less than 25% of the total energy consumption, it will be OK.
I used 13W/m2 and 15W/m2 before, both OK to acquire the certificate, and I
even do not need to explain how the 13 or 15 W/m2 comes.

The elevator energy is included in the process load, so you do not need to
separate it out.

 

Xing


At 2012-09-11 11:26:54,"Aaron Smith" <asmith at mreng.ca> wrote:

Hi,

 

It is unclear to me how to model plug and process loads for Core and Shell
Projects in Canada.  There seems to be a conflict between Appendix 2 and the
Table on Page 292 of the Reference Guide.  Has anyone else run into this
before we send in a CIR?

 

The Appendix wants you to use Table 1 plug load densities (i.e. 1.5W/sq ft
for office buildings) for the tenant spaces while Page 292 says to use
values from the standards (i.e. 0.75W/sq ft for office buildings) or provide
documentation for modelled loads.  

 

It¡¯s almost like they want you to use the higher value for tenant spaces to
account for unknown plug and process loads in CS projects (server rooms and
resultant A/C, etc.).  If so, I¡¯m not sure if we should still model
elevators, escalators in the common areas or if they are supposed to be
accounted for Table 1.

 

Any thoughts are appreciated!


Aaron

 

 

Aaron Smith, P.Eng 

LEED(r) AP BD+C, M-ASHRAE, Mechanical Engineer



t: (902) 422-7393

f: (902) 423-4945

e:  <mailto:asmith at mreng.ca> asmith at mreng.ca

 

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Engineering Ltd. is not responsible for edited or produced versions of this
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