[Bldg-sim] Hotel Renovation and ASHRAE 90.1

[Kevin Kyte]

James,

Building envelopes should reflect existing conditions prior to any revisions per ASHRAE 90.1-2007 Table G3.1.5.f in Baseline Building Performance except for additions and alterations which is covered in paragraph c of the same article.

I wonder if the pre-renovation schedules will also help to save a lot of energy also?  Could it be justified?

Kevin Kyte, PE, BEMP, LEED (r) AP
Mechanical Engineer
Watts Architecture & Engineering, P.C.
95 Perry Street, Suite 300
Buffalo, NY  14203
p:  716 206 5174
f.:  716 206 5199
e:   kkyte at watts-ae.com<mailto:kkyte at watts-ae.com>
http://www.watts-ae.com<http://www.watts-ae.com/>


From: Jim Dirkes [mailto:jim at buildingperformanceteam.com]
Sent: Monday, July 25, 2011 5:14 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Hotel Renovation and ASHRAE 90.1

Dear Forum,
(Excuse cross-posting!)
I'm now modeling a hotel which is seeking LEED certification.  The "Executive summary" goes like this:
* Lower Level and 1st floor are ~25,000 square feet and contain meeting rooms, offices, and Lobby.
* Floors 2-12 are guest rooms.
* The building is all-electric, so I'll use Baseline System #2 for guest rooms and #4 for the remainder.
* The pre-renovation structure was ~80% windows in Climate Zone 2A.
* Post-renovation, the guest rooms floors will be ~45% glass and the remainder will be ~50% windows.

The part I'm uncertain about is how to model the walls and windows. ASHRAE 90.1 Table G3.1, item 5f says
"f. Existing Buildings. For existing building envelopes, the baseline building design shall reflect existing conditions prior to any revisions that are part of the scope of work being evaluated."
That seems to say that the 80% windows becomes the baseline envelope definition....
On the other hand, the new design will certainly save a LOT of energy!

Please let me know your thoughts about:
a) whether the Baseline walls and windows should be modeled "as original" for their "U" value, SHGF and ....
b) whether the normal 40% maximum glazing applies to an existing building renovation for either the Baseline or Proposed design.

Thanks in advance!
I know I'm not the first one to walk this path, but it's the first time I have walked it!

[cid:image001.jpg at 01CC4BB2.F8275190]
Envy is precisely the opposite of love. It seeks everything that another has, including even happiness.  Love, on the other hand, seeks and rejoices in all things good for the other.

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