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.
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James Hansen, PE, LEED AP, BEMP
Senior Associate
1110 N. Glebe Road, Suite 300
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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
HESM&A, Inc.
www.hesm.com
DIRECT:
(678) 628-2787
"Engineering the Built Environment"
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.
Sayg?lar?mla/Best regards,
mehmetokumu?
msc.mechanicalengineer
LEED AP O+M, LEED for Homes Green Rater
Certified Energy Administrator
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