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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">In the baseline model, match existing conditions only with the envelope and only where alterations or additions were not applied.<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> bldg-sim-bounces@lists.onebuilding.org [mailto:bldg-sim-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Mark Sorensen<br>
<b>Sent:</b> Sunday, November 02, 2008 4:31 PM<br>
<b>To:</b> 'Dakota Kelley'; bldg-sim@lists.onebuilding.org; JHANSEN@ghtltd.com<br>
<b>Subject:</b> Re: [Bldg-sim] Modeling existing buildings per LEED EAc1 / App G<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoPlainText">Dakota,<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I am in the process of modeling and submitting a couple of projects under LEED Core and Shell. However, I'm not far enough along to have had any reviews done yet. I have seen in both the LEED CS-2.0 and LEED NC-2.2 reference guides where
existing buildings are addressed in EAc1 credit Calculations. Both RGs state: <i>
"For existing buildings that are being renovated, the building envelope design parameters for the Baseline Design should be modeled using the existing (pre-retrofit) building envelope thermal parameters rather than the ASHRAE Std. 90.1 prescriptive building
envelope requirements for the specified climate. Any proposed changes to the building envelope (such as replacing windows or increasing roof insulation) should be modeled in the Proposed Design".</i>
<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Best of Luck,<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Mark Sorensen<o:p></o:p></p>
<p class="MsoPlainText">Diversified Energy Services<o:p></o:p></p>
<p class="MsoPlainText">Fruitport, Michigan<o:p></o:p></p>
<p class="MsoPlainText">DEnergyServices@comcast.net<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">-----Original Message-----<br>
From: Dakota Kelley [mailto:bldg-sim-bounces@lists.onebuilding.org] On Behalf Of Dakota Kelley<br>
Sent: Sunday, November 02, 2008 11:11 AM<br>
To: bldg-sim@lists.onebuilding.org; JHANSEN@ghtltd.com<br>
Subject: RE: Modeling existing buildings per LEED EAc1 / App G<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">James,<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">My understanding is that the baseline model becomes a bit of a mix for existing buildings (and no, 90.1 2007 doesn't clarify much). The basic rule I've followed is this: any part of the building that will be touched by the new design
should be modeled in the baseline per ASHRAE 90.1. In other words, there's an implicit assumption that the existing building is below the current ASHRAE minimum, and the minimum improvement for the proposed design would be to bring it up to the standard.
LEED credit is earned only by exceeding this minimum improvement.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I would therefore answer your two questions as follows:<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">1) Are the HVAC, thermal parameters, and lighting being touched by the proposed design? If so, then model them in the baseline per 90.1. If not, then baseline = proposed = existing conditions.
<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">The problem with the methodology above arises when existing conditions currently exceed ASHRAE minimums. If this is the case, I would either review the LEED CIR archives for advice, or I would model the existing condition in the baseline
and include a narrative with the submission explaining that the existing condition already exceeded the ASHRAE minimum. I admit I have not encountered this before, but I believe EA Credit 1's intent is best served by maximizing the baseline performance.
<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">2) Model the baseline with windows on that facade, percent matching the proposed design if it's under 40%, but obviously keep the baseline window performance as specified in 90.1.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I would appreciate anyone with differing advice to sound off; I'm working on similar projects that would be affected, and I've had to change my interpretation in the past. Thanks,<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Dakota<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">------------------------------<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Message: 3<o:p></o:p></p>
<p class="MsoPlainText">Date: Fri, 31 Oct 2008 13:29:20 -0400<o:p></o:p></p>
<p class="MsoPlainText">From: "James Hansen" <JHANSEN@ghtltd.com><o:p></o:p></p>
<p class="MsoPlainText">Subject: [Bldg-sim] Modeling existing buildings per LEED EAc1 / App G<o:p></o:p></p>
<p class="MsoPlainText">To: <bldg-sim@lists.onebuilding.org><o:p></o:p></p>
<p class="MsoPlainText">Message-ID:<o:p></o:p></p>
<p class="MsoPlainText"> <25F2BDB6656B8F40A1289ED906D6B5CF1960DE@EXCHANGE1.cadd_group.ghtltd.com><o:p></o:p></p>
<p class="MsoPlainText"> <o:p></o:p></p>
<p class="MsoPlainText">Content-Type: text/plain; charset="iso-8859-1"<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Hello,<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"> <o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I asked a question a few weeks ago about whether or not you have to rotate the Baseline building in a LEED-NC EAc1 calculation (or Appendix G calculation for some other reason). Thank you everyone for your replies (see below)...it appears
that yes, you do need to perform the four (4) separate runs for each direction.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"> <o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">However, I have a more general question about modeling renovations to existing buildings. According to the LEED-NC reference guide, you are to model the Baseline building (if it is existing) with the same "thermal parameters" as the
existing building. Appendix G, Table G3.1 Section 5f) says that "For Existing building envelopes, the baseline building design shall reflect existing conditions prior to any revisions that are part of the scope of work...".
<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"> <o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Futhermore, the reference guide goes on to say that "For projects served by existing HVAC systems, such as a central plant on a campus, Section 10(a) of Table G3.1 states that when there is an existing HVAC system, the model shall reflect
the actual system type using actual component capacities and efficiencies."<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"> <o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">But this section is actually under the "Proposed" column, and I can't find anywhere where it specifically says that the Baseline system should be modeled as the existing building currently stands.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"> <o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">So I have two questions:<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"> <o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">1) If you have an existing building, is the HVAC system supposed to be modeled as it currently exists in the Baseline model, as well as things like the thermal parameters, etc? What about the lighting? If you have an existing
building that you KNOW has a lighting density of 2.0 Watts / sq ft pre-retrofit, is that how you should model the Baseline building?<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"> <o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">2) If I have an existing building that happens to have one exposure with NO windows, and part of the renovation is to install windows on that side of the building, while STILL BEING BELOW 40% total window area. How do I model the
baseline building? With windows there or not? If not, then that is a major penalty, and in reality, I may want to compare my Proposed building to a Baseline model that is 90.1-2004 compliant. Can you even do that if it is an existing building? Can you
choose whether to model the Baseline building it as it exists, or model it per minimum ASHRAE standards?
<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"> <o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I haven't yet received a copy of 90.1-2007. Does Appendix G in that version clarify any of this?
<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"> <o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Thanks in advance!<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"> <o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">James Hansen<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">GHT Limited<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">703-243-1200<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">________________________________<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">From: bldg-sim-bounces@lists.onebuilding.org on behalf of Dakota Kelley<o:p></o:p></p>
<p class="MsoPlainText">Sent: Wed 10/22/2008 4:15 PM<o:p></o:p></p>
<p class="MsoPlainText">To: Kevin Kyte<o:p></o:p></p>
<p class="MsoPlainText">Cc: bldg-sim@lists.onebuilding.org<o:p></o:p></p>
<p class="MsoPlainText">Subject: Re: [Bldg-sim] Building rotation per Appendix G<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Kevin,<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I have since reversed my stance; Eric O'Neill was kind enough to provide<o:p></o:p></p>
<p class="MsoPlainText">me with the following link:<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">http://lists.onebuilding.org/htdig.cgi/bldg-sim-onebuilding.org/2007-Nov<o:p></o:p></p>
<p class="MsoPlainText">ember/005709.html<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I had not come across this thread before, and it sounds like existing<o:p></o:p></p>
<p class="MsoPlainText">buildings need to be rotated regardless of the situation.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Dakota<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">-----Original Message-----<o:p></o:p></p>
<p class="MsoPlainText">From: Kevin Kyte [mailto:kkyte@robsonwoese.com]<o:p></o:p></p>
<p class="MsoPlainText">Sent: Wednesday, October 22, 2008 3:00 PM<o:p></o:p></p>
<p class="MsoPlainText">To: Dakota Kelley; JHANSEN@ghtltd.com<o:p></o:p></p>
<p class="MsoPlainText">Cc: bldg-sim@lists.onebuilding.org<o:p></o:p></p>
<p class="MsoPlainText">Subject: RE: [Bldg-sim] Building rotation per Appendix G<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">What if it is an existing building and there have been alterations to<o:p></o:p></p>
<p class="MsoPlainText">the<o:p></o:p></p>
<p class="MsoPlainText">floorplan?<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">-----Original Message-----<o:p></o:p></p>
<p class="MsoPlainText">From: bldg-sim-bounces@lists.onebuilding.org<o:p></o:p></p>
<p class="MsoPlainText">[mailto:bldg-sim-bounces@lists.onebuilding.org] On Behalf Of Dakota<o:p></o:p></p>
<p class="MsoPlainText">Kelley<o:p></o:p></p>
<p class="MsoPlainText">Sent: Wednesday, October 22, 2008 3:16 PM<o:p></o:p></p>
<p class="MsoPlainText">To: JHANSEN@ghtltd.com<o:p></o:p></p>
<p class="MsoPlainText">Cc: bldg-sim@lists.onebuilding.org<o:p></o:p></p>
<p class="MsoPlainText">Subject: Re: [Bldg-sim] Building rotation per Appendix G<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">James,<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">It is my understanding that it is not necessary to do the rotation on an<o:p></o:p></p>
<p class="MsoPlainText">existing building. I am also working on an existing building, and I<o:p></o:p></p>
<p class="MsoPlainText">plan to submit without rotating. This topic has been debated on the<o:p></o:p></p>
<p class="MsoPlainText">forum in the past with opposing opinions, each side having reasonable<o:p></o:p></p>
<p class="MsoPlainText">arguments, but if my memory is correct the best/last argument was that<o:p></o:p></p>
<p class="MsoPlainText">existing buildings do not need to be rotated. I think this position<o:p></o:p></p>
<p class="MsoPlainText">makes more intuitive sense, too.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I don't believe a definitive resource exists for this question, which is<o:p></o:p></p>
<p class="MsoPlainText">why I plan to "learn the hard way" on my project. I have heard that<o:p></o:p></p>
<p class="MsoPlainText">2009 LEED revisions will address questions specific to existing<o:p></o:p></p>
<p class="MsoPlainText">buildings; hopefully this will be one of them. In the interim, I would<o:p></o:p></p>
<p class="MsoPlainText">ask that anyone with a differing opinion specify the resource guiding<o:p></o:p></p>
<p class="MsoPlainText">them.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Dakota Kelley<o:p></o:p></p>
<p class="MsoPlainText">Telios Engineers<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">-----Original Message-----<o:p></o:p></p>
<p class="MsoPlainText">From: bldg-sim-bounces@lists.onebuilding.org<o:p></o:p></p>
<p class="MsoPlainText">[mailto:bldg-sim-bounces@lists.onebuilding.org] On Behalf Of<o:p></o:p></p>
<p class="MsoPlainText">bldg-sim-request@lists.onebuilding.org<o:p></o:p></p>
<p class="MsoPlainText">Sent: Wednesday, October 22, 2008 2:02 PM<o:p></o:p></p>
<p class="MsoPlainText">To: bldg-sim@lists.onebuilding.org<o:p></o:p></p>
<p class="MsoPlainText">Subject: Bldg-sim Digest, Vol 11, Issue 20<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Send Bldg-sim mailing list submissions to<o:p></o:p></p>
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<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">When replying, please edit your Subject line so it is more specific<o:p></o:p></p>
<p class="MsoPlainText">than "Re: Contents of Bldg-sim digest..."<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Today's Topics:<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"> 1. Building rotation per Appendix G (James Hansen)<o:p></o:p></p>
<p class="MsoPlainText"> 2. About weather data files (M F A Ramadan)<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">----------------------------------------------------------------------<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Message: 1<o:p></o:p></p>
<p class="MsoPlainText">Date: Tue, 21 Oct 2008 17:15:28 -0400<o:p></o:p></p>
<p class="MsoPlainText">From: "James Hansen" <JHANSEN@ghtltd.com><o:p></o:p></p>
<p class="MsoPlainText">Subject: [Bldg-sim] Building rotation per Appendix G<o:p></o:p></p>
<p class="MsoPlainText">To: <bldg-sim@lists.onebuilding.org><o:p></o:p></p>
<p class="MsoPlainText">Message-ID:<o:p></o:p></p>
<p class="MsoPlainText"> <o:p></o:p></p>
<p class="MsoPlainText"><25F2BDB6656B8F40A1289ED906D6B5CF038E117F@EXCHANGE1.cadd_group.ghtltd.co<o:p></o:p></p>
<p class="MsoPlainText">m><o:p></o:p></p>
<p class="MsoPlainText"> <o:p></o:p></p>
<p class="MsoPlainText">Content-Type: text/plain; charset="us-ascii"<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I'm working on a project where I am pursuing LEED EAc1 for an existing<o:p></o:p></p>
<p class="MsoPlainText">building. As I understand it from the LEED-NC reference guide, as well<o:p></o:p></p>
<p class="MsoPlainText">as from some snippets of 90.1, I actually model the baseline building as<o:p></o:p></p>
<p class="MsoPlainText">is currently exists. The reference guide says:<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">"For existing buildings that are being renovated, the building envelope<o:p></o:p></p>
<p class="MsoPlainText">design parameters for the Baseline Design should be modeled using the<o:p></o:p></p>
<p class="MsoPlainText">existing (pre-retrofit) building envelope thermal parameters rather than<o:p></o:p></p>
<p class="MsoPlainText">the ASHRAE 90.1 prescriptive building envelope requirements for the<o:p></o:p></p>
<p class="MsoPlainText">specified climate."<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">So I'm using actual window areas, actual insulation values, etc.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">My question is: if I'm using this exception, do I also no longer have<o:p></o:p></p>
<p class="MsoPlainText">to do a simulation at the four different azimuth required by the LEED<o:p></o:p></p>
<p class="MsoPlainText">EAc1 template?<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I find 90.1, as well as the user's manual, fairly lacking in describing<o:p></o:p></p>
<p class="MsoPlainText">how to apply Appendix G to existing buildings in general....<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Thanks in advance!<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">GHT Limited<o:p></o:p></p>
<p class="MsoPlainText">James Hansen, PE, LEED AP<o:p></o:p></p>
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<p class="MsoPlainText"><o:p> </o:p></p>
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