[Bldg-sim] Leed eac1 Plug loads

[Chris Yates]

Brilliant response! Thanks.

If there's a load defined in the design brief then this is typically an 
undiversified design load. I guess an appropriate diversity factor 
should be modelled in this case.

Are the COMNET appendices B&C freely available? I started out with 
COMNET (or at least our software vendor's interpretation of it), but it 
seemed to have quite high plug loads and low occupancy gain.

Cheers

Chris

On 13/02/2014 21:36, Nick Caton wrote:
>
> This matches my experience as well for plug loads.
>
> I would only plan to itemize plug loads for LEED documentation if 
> attempting to document an energy saving measure above and beyond 90.1 
> pertaining to receptacle loads (such as plug load circuit controls 
> required by the upcoming title 24).
>
> ASHRAE recommends 0.75 W/ft2 for office building receptacle power 
> density in the user's manual for 90.1-2007 (for when you don't have 
> better data to found the inputs on).  10W/m2 is approximately 
> 0.93W/ft2 (if my math is right), so that's certainly within a 
> reasonable range of expectations.
>
> I do not anticipate you will have any issues.  I've regularly 
> documented exactly the value per the user's manual citing that as the 
> source in my documentation with no further comment.
>
> ~Nick
>
> cid:489575314 at 22072009-0ABB**
>
> **
>
> *NICK CATON, P.E.*
>
> SENIOR ENGINEER
>
> Smith & Boucher Engineers
>
> 25501 west valley parkway, suite 200
>
> olathe, ks 66061
>
> direct 913.344.0036
>
> fax 913.345.0617
>
> www.smithboucher.com__
>
> *From:*bldg-sim-bounces at lists.onebuilding.org 
> [mailto:bldg-sim-bounces at lists.onebuilding.org] *On Behalf Of *Duggin, 
> Cory
> *Sent:* Thursday, February 13, 2014 3:26 PM
> *To:* David Eldridge; bldg-sim at lists.onebuilding.org
> *Subject:* Re: [Bldg-sim] Leed eac1 Plug loads
>
> I've never had to provide an itemized list for equipment loads after 
> simply telling them the receptacle loads were modeled as designed per 
> space type.
>
> *Cory Duggin, EI *
>
> /Energy Engineer I /
>
> *TLC Engineering for Architecture *
>
> direct:
>
> 	
>
> 615-346-1939
>
> *From:*bldg-sim-bounces at lists.onebuilding.org 
> <mailto:bldg-sim-bounces at lists.onebuilding.org> 
> [mailto:bldg-sim-bounces at lists.onebuilding.org] *On Behalf Of *David 
> Eldridge
> *Sent:* Thursday, February 13, 2014 3:24 PM
> *To:* bldg-sim at lists.onebuilding.org 
> <mailto:bldg-sim at lists.onebuilding.org>
> *Subject:* Re: [Bldg-sim] Leed eac1 Plug loads
>
> At lower than 25% levels GBCI likely will ask for an itemized list to 
> show that you've considered all of the potential contributors. In 
> addition to Fred's list, add elevators if these aren't separately 
> modeled. Water coolers. Anything that shows up with a connection in 
> the electrical plans.
>
> David
>
> __
>
> David S. Eldridge, Jr., P.E., LEED AP BD+C, BEMP, BEAP, HBDP
>
> *Grumman/Butkus Associates*
>
> __
>
> *From:*bldg-sim-bounces at lists.onebuilding.org 
> <mailto:bldg-sim-bounces at lists.onebuilding.org> 
> [mailto:bldg-sim-bounces at lists.onebuilding.org] *On Behalf Of *Fred Betz
> *Sent:* Thursday, February 13, 2014 3:17 PM
> *To:* Chris Yates; bldg-sim at lists.onebuilding.org 
> <mailto:bldg-sim at lists.onebuilding.org>
> *Subject:* Re: [Bldg-sim] Leed eac1 Plug loads
>
> Chris,
>
> The plug loads are the plug loads. The 25% is just a guidance value 
> from USGBC/GBCI. I've been over and under this level numerous times 
> without a problem.
>
> If you've used the load estimated by the mechanical and/or electrical 
> engineers and apply an appropriate schedule then it should be good 
> enough.
>
> When you're under the 25% threshold a text box will appear for you to 
> explain why. Just state that you've modeled the plug loads as designed.
>
> 10 W/m2 sounds a little low for an office. If the owner has made a 
> commitment to use Energy Star devices or laptops for everyone, then 10 
> W/m2 is plausible. Don't forget to include other equipment like 
> servers/IT equipment, copiers and kitchen equipment (microwave, coffee 
> maker, etc.)
>
> Fred
>
> *Fred Betz***PhD., LEED AP ®BD&C
> Senior Sustainable
> Systems Analyst
>
> 	
>
> 	
>
> *AEI*| AFFILIATED ENGINEERS, INC.
> 5802 Research Park Blvd. | Madison, WI  53719
>
> P: 608.236.1175 | F: 608.238.2614
> fbetz at aeieng.com <mailto:fbetz at aeieng.com> | *www.aeieng.com 
> <http://www.aeieng.com/>*
>
> *From:*Chris Yates [mailto:chris.malcolm.yates at gmail.com]
> *Sent:* Thursday, February 13, 2014 2:28 PM
> *To:* bldg-sim at lists.onebuilding.org 
> <mailto:bldg-sim at lists.onebuilding.org>
> *Subject:* [Bldg-sim] Leed eac1 Plug loads
>
> Dear bldg sim'rs
>
> I'm a little concerned that the plug loads I've modelled in my offices 
> are low and could leed to some unwanted usgbc comments.
>
> I'm meeting the 25% requirement but the peak load in the offices is 
> 10w/m2. Whilst i dont think this is overly optimistic the reviewers 
> may think otherwise. Has anybody had experience of plug loads being 
> queried in detail?
>
> Many thanks
>
> Chris
>
> Sent from my Android device. Please excuse typos, etc.
>
>
>
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