[Bldg-sim] [Equest-users] Leed eac1 Plug loads

Nick Caton ncaton at smithboucher.com
Tue Feb 18 07:45:37 PST 2014
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General Query:

There is NO 25% default/threshold/minimum for process loads.

Older versions of LEED literature led us to believe there was an expectation/requirement for process loads to be 25%, or else some extra tier of documentation/justification would kick in and be required – I believe there was a specific reference to a detailed breakdown in some fashion.  That has since been debunked and the 25% figure is nearly meaningless in the context of LEED energy modeling, except as (very) loose guidance for what might be expected of a “typical” multistory office building.  In reality, annual process load percentages can vary quite a bit on a case-by-case basis for occupied buildings.

What’s I understand is required of process loads (regardless of annual percentage) is to document the associated inputs, and give the reviewer a brief and clear understanding of where those are sourced from.

For typical projects, I may only provide a few lines in the EAp2 spreadsheet, such as:

-          0.75 W/SF for plug loads, per ASHRAE 90.1 User’s Manual guidance, hourly fractional schedule to represent seasonal usage as per building owner input

-          (2) 9.2kW elevator traction motors, modeled with fractional scheduling per ASHRAE 90.1 User’s manual guidance to represent typical usage for “Office” buildings

-          5 kW garage ventilation fan load, with scheduling to represent full ON operation during all occupied hours.

I would leave it to the reviewer to determine if anything requires further explanation or detail, and would supply full information for any or all of the above items upon request through the preliminary review process.

For projects with kitchens, laboratories, industrial processes, or similar special cases with complex or substantial process loads, I would provide a more detailed report of those loads for preliminary review – perhaps by way of attachment or separate upload, if that’s easier.



Equest Query:

Relative to Equipment inputs, Internal energy source inputs allow for greater flexibility in fuel source types: electricity, gas, hot water, and “process” which represents loads that aren’t associated with your utility meters (e.g. gas-powered forklifts).  Downside is you have to convert electrical loads to Btu/h.

It’s your preference to choose how to utilize either or both space input types – whatever is convenient to you.  I personally always use the Equipment input for plug loads and other electric-sourced space loads, using Internal energy source inputs only as needed.

For either case, if you wish to remove all or some fraction of the associated heat load, you can edit the “sensible heat gain ratio” input down zero (default is 1.00).  Also take note there’s a corresponding option for a fraction of the input load to be encountered in the space as a latent heat load (of particular interest for kitchens).

[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: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Heinm04
Sent: Tuesday, February 18, 2014 7:22 AM
To: Wahid Hamed
Cc: Karen Walkerman; bldg-sim at lists.onebuilding.org; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] [Bldg-sim] Leed eac1 Plug loads

Download the latest version of the LEED table 1.4 spreadsheet and see the comment in the Equipment sheet. Basically, you should not arbitrarily set the load to 25%.

 Also, kitchen equipment should probably have a greater detail on heat generation -- see Ashrae handbooks.

Godspeed,

- Matt Hein
Sent from mobile, please excuse typos.

On Feb 18, 2014, at 3:32 AM, Wahid Hamed <wahid.hamed at gmail.com<mailto:wahid.hamed at gmail.com>> wrote:
I would like to raise a question within the same thread context. I am using eQuest and modeling the process energy for a 25-story hotel as 25% of baseline energy cost as per LEED default. The process energy includes (All plug loads/Receptacles, computers, kitchen equipment, laundry, data center, elevators, etc). I assumed that 25% default value is less than the actual process energy.

In order to include all above process energy heat dissipation within HVAC systems simulation for both proposed and baseline models without let eQuest account for direct energy consumption, I have modeled the heat dissipation (assumed equal input power value) in eQuest at Space, Equipment Tab, Internal Energy Sources field, instead of Equipment field.

Is my modeling process at this area correct? Any help, advice, correction will be highly appreciated.


Regards,


Wahid H. Mohamed, BSc, LEED AP BD+C
Mechanical Project Engineer, Energy Modeler
Saudi Diyar Consultants
 (+966)-5467 622 67

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




On Mon, Feb 17, 2014 at 9:02 PM, Hudon, Philippe <phudon at bpa.ca<mailto:phudon at bpa.ca>> wrote:
Karen,

You have the schedule in this pdf file.

Regards,


<image001.jpg>

Philippe Hudon_ing., M.Sc.A.
phudon at bpa.ca<mailto:smayer at bpa.ca>



De : Karen Walkerman [mailto:kwalkerman at gmail.com<mailto:kwalkerman at gmail.com>]
Envoyé : 17 février 2014 12:29
À : Hudon, Philippe
Cc : bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>

Objet : Re: [Bldg-sim] Leed eac1 Plug loads


Philippe,

That is a useful document. Thanks! Do you know where I can find the schedules that are referenced in the table? (A, B, C, etc)

Thanks again,

Karen
On Feb 14, 2014 4:37 PM, "Hudon, Philippe" <phudon at bpa.ca<mailto:phudon at bpa.ca>> wrote:
Hi,

In Canada’s norms, there are this table as reference for the plug loads.

Regards,


<image001.jpg>

Philippe Hudon_ing., M.Sc.A.
phudon at bpa.ca<mailto:smayer at bpa.ca>   |  www.bpa.ca<http://www.bpa.ca>  |  t: 5143833747x2805<tel:5143833747x2805> |  cell: 4187204339<tel:4187204339>
381 rue Belvédère, Alma, Qc, G8B 5Y9

Les informations contenues dans le courriel que vous venez de recevoir, y compris les pièces jointes, sont destinées à l’usage exclusif de la (ou des) personne(s) identifiée(s) comme destinataires et sont confidentielles. Si vous n’en êtes pas le destinataire, soyez avisé que tout usage en est interdit. Si vous avez reçu ce courriel par erreur, veuillez le retourner à l’expéditeur et le supprimer complètement de votre système informatique.

De : bldg-sim-bounces at lists.onebuilding.org<mailto:bldg-sim-bounces at lists.onebuilding.org> [mailto:bldg-sim-bounces at lists.onebuilding.org<mailto:bldg-sim-bounces at lists.onebuilding.org>] De la part de Nick Caton
Envoyé : 13 février 2014 16:36
À : Duggin, Cory; David Eldridge; bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>
Objet : Re: [Bldg-sim] Leed eac1 Plug loads

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

<image002.jpg>

NICK CATON, P.E.
SENIOR ENGINEER

Smith & Boucher Engineers
25501 west valley parkway, suite 200
olathe, ks 66061
direct 913.344.0036<tel:913.344.0036>
fax 913.345.0617<tel:913.345.0617>
www.smithboucher.com<http://www.smithboucher.com>

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 Duggin, Cory
Sent: Thursday, February 13, 2014 3:26 PM
To: David Eldridge; bldg-sim at lists.onebuilding.org<mailto: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<tel: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<tel:608.236.1175> | F: 608.238.2614<tel: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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