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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Hey Vik,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Sounds something like a rock and a hard place, but then I’ve never pursued LEED for only an addition. It’s my hope someone who has can chime in with a tested position/approach. I’m unfamiliar with the CT standards but it seems worth nailing down whether they share the same interpretations as well. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>I can offer a few scenarios/suggestions that may help work around the situation instead of through it in any case:<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='color:#1F497D'>If your target is to achieve LEED certification for the addition only… I’ve seen auditorium and periphery spaces in large schools effectively conditioned with their own independent packaged systems… any chance that might be considered for the design? If so that might conveniently avoid the issue entirely, by not tying into the existing boiler/chiller. This assumes you won’t have other issues meeting the conditions for Table G3.1, part #2.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='color:#1F497D'>I have had the fortune to be involved in a similar high school project which did <u>not</u> explicitly seek or require LEED certification, but the district and design team were collectively very energy conscious and pursued a unique approach without any such mandatory/enforced regulations. Budgets were arranged from the beginning to encompass both a large new building addition in addition to targeted retrofits/replacements of existing HVAC, envelope and lighting systems. The cohesive goal was to identify and implement the most cost-effective means to reduce and minimize the “whole building” EUI and utility bills – only rarely focusing on the new addition in isolation of the “big picture.” This was a very involved and satisfying process… and in the end I think everyone came away feeling the right decisions were made for the entire facility with the resources available. With all that in mind – are you too far along to consider re-allocating (or expanding) your project budget, perhaps VE-ing portions of the present design, to put those dollars to more effective use retrofitting/improving existing systems? <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Still for what it’s worth, this specific interpretation does come across as very “by the book” and in practice unreasonably inflexible considering LEED certification is being sought only for the addition. On the flip side, the interpretation request language is not nearly so clear as your more concise email just now – possibly the responder hasn’t fully grasped why you’re asking. If the individual(s) providing this clarification are open to a discussion, I would propose extending the conversation to recognize “the whole building must be modeled” and “the whole building must be incorporated into the performance rating” as two importantly distinct statements – and that’s the clarification you’re driving towards. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>It would seem reasonable for the proposed model of a building addition to incorporate and approximate the systems & building areas not involved in the addition (modeling the whole building effectively), separately meter all “existing to remain” loads and systems, and then calculate the proposed performance rating specifically using a weighted fraction of the energies consumed by shared & existing-to-remain systems (boilers and chillers, in this case). All other consumptions exclusive to the addition could then be isolated and removed from the performance rating calculation. Adopting a procedure along these lines would have a number of positive effects, including: <o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='color:#1F497D'>Leveling the playing field for additions to small vs. large buildings<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='color:#1F497D'>Encourage designers to consider replacing, upgrading and/or improving the operations of existing shared systems to remain<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='color:#1F497D'>Not driving design teams to construct entirely independent HVAC systems where it may make a lot more sense for the building owner/environment to utilize existing systems of sufficient capacity.<o:p></o:p></span></p><p class=MsoListParagraph><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Maybe some of this will help you plot a course with the powers that be, though I sincerely hope there’s a more definite answer/precedent to draw upon. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Best wishes,<i><o:p></o:p></i></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>~Nick<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><span style='color:#1F497D'><img width=119 height=37 id="Picture_x0020_1" src="cid:image001.jpg@01CCBE42.48F24E20" alt="cid:489575314@22072009-0ABB"></span><b><span style='font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:12.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E'>NICK CATON, P.E.</span></b><b><span style='font-size:12.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:7.5pt;color:#CC9900'>SENIOR ENGINEER<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;color:#CC9900'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>Smith & Boucher Engineers</span><span style='font-size:7.5pt;font-family:"Times New Roman","serif";color:#CC9900'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>25501 west valley parkway, suite 200<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>olathe, ks 66061<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>direct 913.344.0036<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>fax 913.345.0617<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><a href="www.smithboucher.com" title="blocked::www.smithboucher.com"><span style='font-size:10.0pt'>www.smithboucher.com</span></a></span><u><span style='font-size:10.0pt;color:blue'> </span></u><span style='color:#1F497D'><o:p></o:p></span></p></div><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><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>Sami, Vikram<br><b>Sent:</b> Monday, December 19, 2011 10:59 AM<br><b>To:</b> bldg-sim@lists.onebuilding.org<br><b>Cc:</b> Glazer, Breeze<br><b>Subject:</b> [Bldg-sim] Question: Table G3.1<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='color:#1F497D'>Here’s a brain puzzler for the list. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>I’m assisting a team designing an addition (auditorium + rehearsal space) to an existing high school in Connecticut. As a public project receiving state funding, CT’s High Performance Building Standard applies which requires a 21% energy cost savings (LEED for Schools Silver is also targeted for the new addition only). <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>The new space will have independent/new ventilation systems, but will most likely utilize the boiler and potentially chillers of the existing school building. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Buried in ASHRAE modeling guidelines, we discovered (long after project started and engineers “completed” the model) that additions and alterations that share HVAC systems with existing spaces, are required to include those spaces in their energy model. The new space is designed for a 24% reduction – but if the existing spaces (approx. 3x the sf of new space) are included performance will fall way below the required threshold. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>We can’t understand how other LEED projects in similar situations ever meet energy reduction requirements, has anyone dealt with this on a LEED project and found ways to circumvent? Has anyone come across a similar condition, and if so – how did you approach it? <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Many Thanks in advance - <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Vikram<o:p></o:p></span></p><div><div><p class=MsoNormal style='text-autospace:none'><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'><o:p> </o:p></span></b></p><p class=MsoNormal style='text-autospace:none'><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>Vikram Sami</span></b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>, LEED AP BD+C<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>Sustainable Design Analyst<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>1315 Peachtree St. NE, Atlanta, GA 30309<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>t: 404-443-7462 f: </span><span lang=ES style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>404.892.5823 </span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'> e: vikram.sami@perkinswill.com </span><span style='color:#1F497D'><a href="http://www.perkinswill.com/"><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray;text-decoration:none'>www.perkinswill.com</span></a></span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'><o:p></o:p></span></p><p class=MsoNormal style='margin-bottom:3.0pt;text-autospace:none'><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>Perkins+Will.</span></b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'> </span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#ADD425'>Ideas + buildings that honor the broader goals of society</span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:green'><o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#2CA2C4'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#2CA2C4'>Perkins+Will is carbon neutral.</span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#96BC0D'> </span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>Learn more about our </span><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#2CA2C4'><a href="http://2030e2.perkinswill.com/"><span style='color:#2CA2C4'>2030 Challenge Estimating + Evaluation</span></a></span></b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'> tool for fossil fuel free buildings <o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:gray'>This email and any files transmitted with it are confidential and intended solely for the addressee. 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