[Bldg-sim] thoughts on App G system type for mixed use building

Wed Mar 10 09:44:40 PST 2010

Thanks Greg, but based on the heating density, I can't classify these as
semi-heated.

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: Gregg Liddick [mailto:gliddick at theepstengroup.com] 
Sent: Wednesday, March 10, 2010 11:21 AM
To: James Hansen; bldg-sim at lists.onebuilding.org
Subject: RE: thoughts on App G system type for mixed use building

Hi James,

It sounds like the storage and workshop area may be semi-heated as
defined by Section 3.  I'd recommend looking into that.  If the spaces
are semi-heated then they should be modeled only with heating in the
baseline case and the requirements of Table G3.1.10 don't apply.  It's
also worth noting that if the spaces are semi-heated they should be
modeled with different envelope values in the baseline case (based on
the semi-heated in Table 5.5).

Best Regards,

Gregg Liddick, EIT, LEED(r) AP

The Epsten Group, Inc.

429 Edgewood Avenue

Atlanta GA 30312

Phone: 404-577-0370  ext. 102

Fax: 404-577-1739

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

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From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of James
Hansen
Sent: Wednesday, March 10, 2010 11:02 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] thoughts on App G system type for mixed use building

I've got a 92,000 square foot Industrial building that I am modeling.
If you went by Table G3.1.1A, the baseline system type would be System 5
- Packaged VAV with reheat.

However, of the 92,000 square feet, approximately 16,000 sq ft is
conditioned to standard 75/72 degrees, while the remainder is a mixture
of storage, manufacturing, etc, and is heated to 55 and cooled to 120
(no actual cooling in proposed model, but you've got to insert some sort
of cooling system per App G).

So I really have 16,000 sq ft that is fully conditioned, and 76,000 sq
ft that is only partially conditioned (ie the peak thermal load differs
by 10 Btu/h-ft2).  

Any guesses how I configure this?

Do I have a packaged VAV system for the 76,000 sq ft of shop/storage and
isolate the 16,000 ft2 of real conditioned space as system 3 per the
Exception to G3.1.1?  

Or do I have a packaged VAV system for the 16,000 ft conditioned space
and isolate the 76,000 sq ft as system 3?

To further complicate things, since the 76,000 sq ft is split between
storage and manufacturing, where there is theoretically an operating
schedule that differs by 40 hours or more a week between these two
different use types, do I actually just end up with ALL system 3 even
though the total net building area is above the 75,000 sq ft cutoff
where we're supposed to go to System 5?

I'm confused!  Any help would be appreciated.

To recap:

16,000 sq ft office, heated/cooled to 72/75

30,000 sq ft of storage with basically no operating hours per week,
heated/cooled to 50/120

36,000 sq ft of manufacturing / workshop area that is used approximately
50 hrs a week, heated/cooled to 50/120

Mixture of System 3 and System 5, or ALL system 3?

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/> 

________________________________

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.

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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