[Bldg-sim] Existing building HVAC modeling

[Seth P. Spangler]

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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