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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Dear Forum,<o:p></o:p></p><p class=MsoNormal>(Excuse cross-posting!)<o:p></o:p></p><p class=MsoNormal>I'm now modeling a hotel which is seeking LEED certification. The "Executive summary" goes like this:<o:p></o:p></p><p class=MsoNormal>* Lower Level and 1st floor are ~25,000 square feet and contain meeting rooms, offices, and Lobby.<o:p></o:p></p><p class=MsoNormal>* Floors 2-12 are guest rooms.<o:p></o:p></p><p class=MsoNormal>* The building is all-electric, so I'll use Baseline System #2 for guest rooms and #4 for the remainder.<o:p></o:p></p><p class=MsoNormal>* The pre-renovation structure was ~80% windows in Climate Zone 2A.<o:p></o:p></p><p class=MsoNormal>* Post-renovation, the guest rooms floors will be ~45% glass and the remainder will be ~50% windows.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The part I'm uncertain about is how to model the walls and windows. ASHRAE 90.1 Table G3.1, item 5f says <o:p></o:p></p><p class=MsoNormal>"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."<o:p></o:p></p><p class=MsoNormal>That seems to say that the 80% windows becomes the baseline envelope definition....<o:p></o:p></p><p class=MsoNormal>On the other hand, the new design will certainly save a LOT of energy!<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Please let me know your thoughts about:<o:p></o:p></p><p class=MsoNormal>a) whether the Baseline walls and windows should be modeled "as original" for their "U" value, SHGF and ....<o:p></o:p></p><p class=MsoNormal>b) whether the normal 40% maximum glazing applies to an existing building renovation for either the Baseline or Proposed design.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks in advance!<o:p></o:p></p><p class=MsoNormal>I know I'm not the first one to walk this path, but it's the first time I have walked it!<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><img width=336 height=192 id="Picture_x0020_1" src="cid:image003.jpg@01CC4AEE.31F23310" alt="Description: BPT BizCard JVDII Updated"><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt'>Envy is precisely the opposite of love. It seeks everything that another has, including even happiness. Love, on the other hand, seeks and <u>rejoices</u> in all things good for the other.</span><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>