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

[Gregg Liddick]

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/>


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