[Bldg-sim] Existing building HVAC modeling

James Hansen JHANSEN at ghtltd.com
Fri Sep 4 06:50:31 PDT 2009


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 <http://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(r) 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 <http://www.ghtltd.com/> 

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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, and destroy this communication and all copies thereof, including all attachments.  Thank you.



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