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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'>Christian,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>I have not seen this with a VRV system, but I’ve had a similar experience with a VAV system. The LEED reviewer insisted thermal blocks be modeled identically in Baseline and Proposed. That meant a Proposed bldg with 2 AHU’s each with about 35 VAV terminal units became about 70 package units in the Baseline bldg. Crazy, there is not enough roof space for 70 units.<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'>Even though the Baseline systems do not always make sense, Appendix G attempts to make the energy models similar between everyone. It tries to standardize things for equal comparison. That’s my understanding.<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 do have a question. I’m not familiar with Trace. In HAP only systems with heating or cooling coils can be added to a plant. How is it that Trace allows DX units be added to a plant? Seems you have a choice of multiple plants, one per system OR one plant for all systems. I think you should choose the model that most accurately represents a PSZ-HP. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-family:"Arial","sans-serif";color:#1F497D'> </span></b><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'> </span></b><b><span style='font-family:"Arial","sans-serif";color:red'>PH</span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'> <u>MECHANICAL ENGINEERING<br></u> <b>Reba Schaber</b> Mechanical Engineer, P.E.<br> LEED Accredited Professional<br>1660 N. Alvernon Way Voice: (520) 731-2060<br>Tucson, Arizona 85712 Fax: (520) 731-2061<br> <u><a href="mailto:rschaber@phmech.com">rschaber@phmech.com</a></u></span><span style='color:#1F497D'><o:p></o:p></span></p><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>Christian Kaltreider<br><b>Sent:</b> Tuesday, August 30, 2011 9:24 AM<br><b>To:</b> bldg-sim@lists.onebuilding.org<br><b>Subject:</b> [Bldg-sim] 90.1 Baseline Model for Proposed VRV Design Model<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='color:#1F497D'>Hi All,<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 am doing an Appendix G model for LEED. The proposed building uses a VRV system where each room has individual control over its own VRV unit. All of the VRV units share 2 heat pumps. My problem is this: Since each room has individual control, each room is a ‘thermal block’. I have combined as many as I can according to the Appendix G rules. However, I still have many thermal blocks. For the baseline, I am required to model a PSZ-HP (packaged roof top unit heat pump) for each thermal block. This is giving a bunch of tiny rooms their own individual RTUs, which seems ridiculous and it is driving my baseline energy use higher than reasonable (primarily in heating energy…not sure why). <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 am modeling in TRACE, giving one SYSTEM per thermal block, and one PLANT per SYSTEM. If I am allowed to connect all of my systems to just one plant, my energy use becomes more reasonable…but this seems to go against Appendix G.<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'>Has anyone come across this issue when modeling a baseline for a proposed VRV system? <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'>Thanks,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Christian<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='font-size:12.0pt;color:#1F497D'>Christian Kaltreider, LEED AP<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Energy Engineer<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Sud Associates, PA<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>20 Battery Park Ave<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Flat Iron Building, Suite 706<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Asheville, NC 28801<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>(828) 255-4691<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><a href="mailto:ckaltreider@sudassociates.com">ckaltreider@sudassociates.com</a><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><div class=MsoNormal align=center style='text-align:center'><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><hr size=1 width="100%" noshade style='color:#ACA899' align=center></span></div><p class=avgcert>No virus found in this message.<br>Checked by AVG - <a href="http://www.avg.com">www.avg.com</a><br>Version: 10.0.1392 / Virus Database: 1520/3867 - Release Date: 08/30/11<o:p></o:p></p></div></body></html>