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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A'>Patrick,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A'>Here are a few considerations:<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A'><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A'>Apartments for working people will have low loads during the day and high loads at night. The offices will have the reverse pattern. Depending on the actual office schedules, the actual residential occupancy pattern and the ratio of office / residential space, 50% might work very well. 50% may also be rather close to “irresponsible” unless the local population is very tolerant of room temperatures that are a few degrees higher than normal!<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A'><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A'>Regardless of #1 above, a LEED project should model the building based on the architect and Engineer’s “Basis of Design” (BOD) document. The scheduling and diversity patterns I mention in #1 are not commonly part of a BOD document, but in your case they sound critical. You should (strongly) request this information! If you make assumptions that differ from the Engineer’s you may spend endless hours trying to reduce unmet cooling load hours (and probably will not get paid for them)<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A'><span style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A'>Once you are confident of the schedules that have been assumed by the BOD, you should be able to represent them for the energy model. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A'>Note: Because each apartment has two fan coils, each with a thermostat, you really have two zones. This may become important for the cooling diversity.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A'><o:p> </o:p></span></p><div><p class=MsoNormal align=center style='text-align:center'><b><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#0A3782'>James V Dirkes II, PE, BEMP, LEED AP</span></b><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#3434F4'><br></span></b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A'><a href="http://www.buildingperformanceteam.com/"><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#BFBFBF'>www.buildingperformanceteam.com</span></b></a></span><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#BFBFBF'> <br></span></b><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#548DD4'>Energy Analysis, Commissioning & Training Services</span></b><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#778188'><br></span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#778188'>1631 Acacia Drive, Grand Rapids, MI 49504</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#778188'> USA</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#778188'><br>616 450 8653<o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A'><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>Aaron Smith<br><b>Sent:</b> Friday, November 29, 2013 6:49 PM<br><b>To:</b> Patrick Bivona; bldg-sim@lists.onebuilding.org<br><b>Subject:</b> Re: [Bldg-sim] Modelling diversity in single zone apartments<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal style='background:white'><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Patrick,<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Calibri","sans-serif";color:#1F497D'>I suspect they didn't assume that the bedroom wasn't cooled at the same time as the living room. They may have assumed that the cooling schedule of the office space is different than the apartments - maybe 8am to 5pm M-F for the offices and close to the opposite for the apartments. Or they may have determined that the building peak load was 50% of the sum of the individual loads. A more likely scenario would be that the combined affect of both of those might equal 50%.<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Calibri","sans-serif";color:#1F497D'>I don't think it would be acceptable to turn cooling off in half of the apartments even if you did the same thing in the Baseline building. Are you running into issues with the chiller being undersized?<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Aaron<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p></div><table class=MsoNormalTable border=0 cellpadding=0 width="100%" style='width:100.0%;background:white;border-spacing:0px'><tr><td style='padding:.75pt .75pt .75pt .75pt;font-size:initial;text-align:initial'><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in' id="_persistentHeader"><div><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"'>Patrick Bivona<o:p></o:p></span></p></div><div><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Sent: </span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Thursday, November 28, 2013 23:32<o:p></o:p></span></p></div><div><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>To: </span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><o:p></o:p></span></p></div><div><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Subject: </span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>[Bldg-sim] Modelling diversity in single zone apartments<o:p></o:p></span></p></div></div></td></tr></table><p class=MsoNormal><o:p> </o:p></p><div id="_originalContent"><div><p class=MsoNormal>Hi all,<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><p class=MsoNormal>I'm modelling a mixed office/residential tower building with 160 apartments in tropical climate, for LEED. The apartments are centrally cooled with fan coil units, in the living room and bedrooms. The design team sized the chiller with a diversity of 0.5, probably assuming that when the occupants are in the living room, they're not cooling the bedrooms or something of the sort.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Given the number of apartments, I modelled each apartment as a single block. I cannot use zone multipliers because of the specific geometry of the building. I have one combined FCU for each apartment, which is of course either on or off. I'm also grouping apartments based on orientation, but that's beside the point.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>My question is about an approach to modelling the diversity of use of FCUs in the apartments. With my modelling simplification, I cannot model the diversity of cooling within an apartment. So what would be an acceptable approach?<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I can only think of turning cooling off in half of the apartments, though apartments with cooling turned off are occupied and have internal loads. Would a LEED reviewer be ok with such an approach. Or is there a better way?<o:p></o:p></p></div></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Thanks,<o:p></o:p></p></div><div><p class=MsoNormal>Patrick<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div></div><p class=MsoNormal><br><br><o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p></div></body></html>