[Equest-users] LEED v4 - Commercial Interiors Energy Model Questions

[Jim Paulino]

Thanks to all who responded to my original question.

I was able to find a V3 form and "play" with hypothetical energy consumption and costs. The form prorates the usage based upon the project scope and yields results with what I'd expect if only doing the project area.

This does lead to interesting possibilities when you consider that a common central energy plant operates at different efficiencies based upon the load it is seeing and also that reduction in total building demand/consumption can move you into a different utility company energy cost rate bracket.

It would seem to me that a more conservative way is just to model the project area against itself, as James indicates is the case in the V4, and not try to include tenants or spaces outside that area.

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of James Hansen
Sent: Thursday, September 18, 2014 11:42 AM
To: Jones, Christopher; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] LEED v4 - Commercial Interiors Energy Model Questions

Under v4, LEED-ID&C models are only to include those portions of the building in the project scope.  You don't model the whole building.  Here is a slide from a LEED v4 presentation I did recently:

[cid:image001.png at 01CFD3E9.6F2FD480]

For HVAC systems, you model your proposed plant but then pro-rate capacities, airflows, etc based on area ratio of scope:building.

GHT Limited
James Hansen, PE, LEED AP, BEMP
Senior Associate
1110 N. Glebe Road, Suite 300
Arlington, VA 22201
703.243.1200 (main)
703.338.5754 (direct/cell)
www.ghtltd.com<http://www.ghtltd.com>

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Jones, Christopher
Sent: Thursday, September 18, 2014 11:36 AM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] LEED v4 - Commercial Interiors Energy Model Questions

Further to this discussion, I have a couple of question about LEED v4 CI modeling:

1.        To confirm, the baseline building is to be modeled based on 90.1-2010, Appendix G, Table G3.1(5) a-e and not f.  In my case, the building is a heritage building with a poor envelope.  As I understand it, this will be compared with a baseline with a good envelope, based on the 90.1-2010 requirements.

2.       The existing building is core & shell.  The CI portion makes up about 75% of the building.  The base building heating and cooling plant serve the existing and CI portions of the building.  Therefore the entire building is to be modeled using that existing plant (boilers and a fluid cooler serving a WSHP loop).

3.       I am not sure of how the lighting should be modeled in the portion of the building not included in the CI portion.  The base building lighting has only a few fixtures but in reading the LEED v4 CI reference manual, page 130, Step 7, it states "Include design conditions for systems within the tenant scope of work, including HVAC, lighting and plug loads, and existing conditions for systems that are unchanged".  Does this mean that the lighting in the proposed model, non-CI portion will have a low lighting power density whereas the baseline model in those portions will have the 90.1-2010 lighting power density?  This does not seem correct to me.

Thanks for any assistance!

Christopher Jones, P.Eng.
Tel: 416.644.4226 * Toll Free: 1.888.425.7255 x 527

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Mehmet Okumus / ERKE
Sent: Wednesday, September 17, 2014 2:17 AM
To: 'James Hansen'; 'Jim Paulino'; equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] LEED 2009 - Commercial Interiors Energy Model Question

Hi Jim,
Please find the comments of GBCI about LEED v2009 CI energy modelling:

The entire building segment served by the common HVAC systems (i.e. chilled water plant, hot water plant, dedicated outdoor air systems) must be reflected in the Proposed and Baseline models, as outlined in Step 2 in the LEED ID+C v2009 Reference Guide. The project segment portion of the building, including the portion of the building served by the common HVAC systems but located outside of the LEED project scope, must be modeled identically in the Proposed and
Baseline models to reflect the existing conditions (i.e. envelope components, operation schedules, occupancy type, interior lighting power and controls, HVAC systems, thermal zones, and plug loads). For the project area, which is the portion of the building included in the LEED project scope, the Proposed model must reflect the system upgrades that are being performed as part of the LEED project scope in the actual design, and the Baseline model must reflect the equivalent Appendix G requirements for each respective upgrade. Revise the Proposed and Baseline models, as needed, to reflect the entire project segment served by the common HVAC systems which serve the project area. Ensure that the project segment, located outside of the LEED project scope, is modeled identically in each model based on the existing conditions. In addition, ensure that the project area reflects the actual design for the system being
upgraded in the Proposed model, and that the Baseline model reflects the equivalent Appendix G requirements for each system upgrade in the actual design.

Alternatively, the Alternative Baseline compliance path may be followed. If following the Alternative Baseline compliance path, the entire project segment portion of the building, including the portion of the building served by the common HVAC systems but located outside of the LEED project scope, must be reflected in the Proposed and Baseline models; however, the Proposed model must reflect the actual design (for the project area) and existing components (for the remaining spaces outside of the LEED project scope), and the Baseline model reflects the Appendix G Baseline modeling requirements (i.e. envelope, lighting, and HVAC systems) for the entire segment area of the project (both project area and spaces located outside of the LEED project scope). If following the Alternative Baseline, indicate that change within a narrative and provide revised simulation input summary reports for the Proposed and Baseline model reflecting the changes.

Saygılarımla/Best regards,

mehmetokumuş
msc.mechanicalengineer
LEED AP O+M, LEED for Homes Green Rater
Certified Energy Administrator
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From: James Hansen [mailto:jhansen at ghtltd.com]
Sent: Wednesday, September 17, 2014 12:31 AM
To: Jim Paulino; equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] LEED 2009 - Commercial Interiors Energy Model Question

There is an area on the template where you enter project area versus entire building area (and the savings is pro-rated...or whatever the opposite of pro-rating is).  With a 20-story office building, you probably only need to see an improvement of 1% building wide (on HVAC consumption) for it to equate to something greater than 15% for your tenant.   I highly recommend looking at the reference guide for this.  There are a couple different ways you can model the baseline building.

GHT Limited
James Hansen, PE, LEED AP, BEMP
Senior Associate
1110 N. Glebe Road, Suite 300
Arlington, VA 22201
703.243.1200 (main)
703.338.5754 (direct/cell)
www.ghtltd.com<http://www.ghtltd.com>

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Jim Paulino
Sent: Tuesday, September 16, 2014 5:27 PM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] LEED 2009 - Commercial Interiors Energy Model Question

Does anyone have any experience with energy modeling for LEED 2009 Commercial Interiors credit EA1.3 - Optimize Energy Performance?

We have a client that is going to occupy a single floor of a 20 story office building and they are putting new HVAC systems in for that floor. The main AC unit for the floor is a condenser water cooled air handler (commonly referred to as a SWUD unit) that distributes air to VAV boxes. (the rest of the building uses a similar system and uses the condenser water loop for heat rejection)

The LEED manual indicates that the whole building must be modeled, which would almost seem like any savings from the one floor get diluted by what is happening on the others.

Thanks for any insight

Jim Paulino, P.E., CxA, LEED (tm) AP







Mechanical Engineer



Associate



jim.paulino at hesm.com<mailto:jim.paulino at hesm.com>



HESM&A, Inc.



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



DIRECT:

(678) 628-2787





"Engineering the Built Environment"




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The information contained in this communication is confidential, may be privileged, and is intended only for the use of the addressee. It is the property of GHT Limited. Unauthorized use, disclosure or copying of this communication or any part thereof is strictly prohibited and may be unlawful. If you have received this communication in error, please notify me immediately by return e-mail or by e-mail to ght at ghtltd.com<mailto:ght at ghtltd.com>, and destroy this communication and all copies thereof, including all attachments. Thank you.
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