[Bldg-sim] Existing building HVAC modeling

[Karen Walkerman]

>From table G3.1:

"The HVAC system(s) in the baseline building design shall be of the type and
description specified in G3.1.1, shall meet the general HVAC system
requirements specified in G3.1.2, and shall meet any system-specific
requirements in G3.1.3 that are applicable to the baseline HVAC system
type(s)."

the only time the existing building properties are used are for the building
envelope.

--
Karen

On Fri, Sep 4, 2009 at 9:50 AM, James Hansen <JHANSEN at ghtltd.com> wrote:

>  Thanks for the response Seth.  The entire building is undergoing a
> renovation (new windows, insulation, lighting)…and I’m going to keep the
> existing HVAC system in the EXISTING portion of the building for my baseline
> model.  I just don’t know how to treat the NEW portion of my building in the
> baseline model.  The plant is interconnected, so Item No 2 in Table G3.1
> doesn’t apply.  I want to include the existing building in the model (and I
> have to).
>
>
>
> Any other advice on how to properly set up the baseline HVAC system for a
> new portion of an existing building if the proposed chilled water plant is
> being expanded to accommodate new load but the existing airside systems in
> the existing building are NOT being touched?
>
>
>
> Common sense would say that my baseline building also has a new App G
> chiller to accommodate new load and the new airside systems are shutoff
> boxes….but if there is a chance that the new portion of the building is
> treated as a standalone 15,000 square foot addition, packaged RTUs may make
> the proposed system even more efficient.
>
>
>
> Paul, thanks for the email…I’m going to look thru CIRs and see what I can
> find.  Can’t wait for LEED v3.0 where this convenient Option goes away.
>
>
>
> Thanks again,
>
>
>
> *GHT Limited
> **James Hansen**, PE, LEED AP*
>
> *Senior Associate***
>
> 1010 N. Glebe Rd, Suite 200
>
> Arlington, VA  22201-4749
>
> 703-338-5754 (Cell)
>
> 703-243-1200 (Office)
>
> 703-276-1376 (Fax)
>
> www.ghtltd.com
>
> *From:* Seth P. Spangler [mailto:sspangle at rmf.com]
> *Sent:* Friday, September 04, 2009 9:23 AM
> *To:* James Hansen; bldg-sim at lists.onebuilding.org
> *Subject:* RE: [Bldg-sim] Existing building HVAC modeling
>
>
>
> James,
>
>
>
> If you are only adding an additional floor – and are not renovating any
> portion of the existing 1st-4th floors then I would model the 5th floor as
> if it was a new building by itself according to App. G guidelines. See Table
> G 3.1 item no. 2 in 90.1-2004
>
>
>
>
>
> If the entire building is undergoing a renovation but the existing HVAC
> systems are existing to remain then the building would be modeled to reflect
> the existing system types and capacities. Refer to the LEED manual for these
> guidelines.
>
>
>
> Hope this helps.
>
>
>
> Seth Spangler, LEED® AP
>
> Project Engineer
>
>
>
> RMF Engineering, Inc
>
> Ph: (843) 971-9639 ext:1497
>
> Fax: (843) 971-9641
>
> sspangle at rmf.com
>
> *From:* bldg-sim-bounces at lists.onebuilding.org [mailto:
> bldg-sim-bounces at lists.onebuilding.org] *On Behalf Of *James Hansen
> *Sent:* Friday, September 04, 2009 9:07 AM
> *To:* bldg-sim at lists.onebuilding.org
> *Subject:* [Bldg-sim] Existing building HVAC modeling
>
>
>
> I’m modeling a building for LEED EAc1 compliance, and was wondering how you
> are supposed to model existing building HVAC systems if you are adding
> square footage to the building.
>
>
>
> Let’s assume you have a 4-story building with a 2-chiller HVAC plant and
> dual temp boxes.  If you were to add a 5th floor to the building, what
> would your baseline model look like?  I know that the 1st four floors
> would use the existing HVAC system, but would your new 5th floor be
> treated as a new 15,000 square foot area with packaged RTUs, or would you
> add a new chiller to the existing HVAC chilled water plant, and have that
> chiller meet all the requirements of App G, and have shutoff VAV boxes for
> the 5th floor in lieu of dual temp boxes?
>
>
>
> For reference, under our proposed design, we are doing just that:  adding a
> frictionless chiller to the plant to make up the extra load.
>
>
>
> *GHT Limited
> **James Hansen**, PE, LEED AP*
>
> *Senior Associate*
>
> 1010 N. Glebe Rd, Suite 200
>
> Arlington, VA  22201-4749
>
> 703-338-5754 (Cell)
>
> 703-243-1200 (Office)
>
> 703-276-1376 (Fax)
>
> www.ghtltd.com
>  ------------------------------
>
> 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
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> attachments.  Thank you.
>
> ------------------------------
> 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
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