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<DIV>James,</DIV>
<DIV>90.1-2004 addendum u includes the 'one system per floor' wording for systems 5 thru 8, but floors can be grouped when the thermal blocks are similar. For LEED, it is optional to use addenda. 90.1-2007 adopts the same wording.</DIV>
<DIV>Regards,</DIV>
<DIV>Bill </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>
<DIV><FONT face=Technic>Bill Talbert, PE, <SPAN style="FONT-SIZE: 12pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA"><SPAN style="FONT-SIZE: 12pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: Technic; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA; mso-bidi-font-family: Arial"><FONT size=2>LEED® AP</FONT></SPAN></SPAN><BR>Mechanical Systems</FONT></DIV>
<DIV><FONT face=Technic>Phone: (608) 441-6677<BR>E-mail: btalbert@aeieng.com<BR><BR>Affiliated Engineers Inc.<BR>5802 Research Park Blvd.<BR>Madison, WI. 53719<BR>Tel. (608) 238-2616<BR>Fax. (608) 238-2614</FONT></DIV></DIV>
<DIV><BR>>>> "James Hansen" <JHANSEN@ghtltd.com> 12/10/2008 11:45 AM >>><BR></DIV>
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<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">Thanks for your response Richard.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">Can anyone confirm whether ASHRAE 90.1-2007 specifically says that your Baseline model MUST have a system per floor?<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">I can’t seem to find it in 2004, or the user’s manual, or in the LEED-NC reference guide.</SPAN><SPAN style="COLOR: #1f497d"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p> </o:p></SPAN></P>
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<P class=MsoNormal><B><SPAN style="FONT-SIZE: 12pt; COLOR: teal; FONT-FAMILY: 'Arial','sans-serif'">GHT Limited<BR></SPAN></B><B><SPAN style="FONT-FAMILY: 'Arial','sans-serif'"><?xml:namespace prefix = ns0 ns = "urn:schemas-microsoft-com:office:smarttags" /><ns0:PersonName><SPAN style="COLOR: black">James Hansen</SPAN></ns0:PersonName></SPAN></B><B><SPAN style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 'Times New Roman','serif'">, PE, LEED AP<o:p></o:p></SPAN></B></P>
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<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p> </o:p></SPAN></P>
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<P class=MsoNormal><B><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"> Richard Ellison [mailto:REllison@southlandind.com] <BR><B>Sent:</B> Wednesday, December 10, 2008 11:53 AM<BR><B>To:</B> James Hansen<BR><B>Subject:</B> RE: [Equest-users] Number of systems required by 90.1?<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">I interpret ASHRAE to suggest one should use 5 AHUs for just the reason you mentioned. They are different because of different exposures. One has slab and one has roof. The external load would be different as would the return plenum temperatures. One might be able to group floors 2-5 energy wise but I recall reading, perhaps in 2007 where they specifically meant on per floor for the baseline. I always have at least one AHU per floor in my baseline models. Using only one AHU would be cheating a bit. This would be the same logic that says one must zone rooms with different occupancies or schedules separately.</SPAN><o:p></o:p></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"> </SPAN><o:p></o:p></P>
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<P class=MsoNormal><SPAN style="FONT-SIZE: 8pt; COLOR: #1f497d; FONT-FAMILY: 'Arial','sans-serif'">RICHARD ELLISON</SPAN><SPAN style="COLOR: #e36c0a"> <BR></SPAN><SPAN style="FONT-SIZE: 8pt; COLOR: #1f497d; FONT-FAMILY: 'Arial','sans-serif'">Energy Engineer</SPAN><SPAN style="FONT-SIZE: 10pt; COLOR: #e36c0a"> </SPAN><o:p></o:p></P>
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<P class=MsoNormal><SPAN style="FONT-SIZE: 8pt; COLOR: #1f497d; FONT-FAMILY: 'Arial','sans-serif'">22340 Dresden Street, Suite 177</SPAN><o:p></o:p></P>
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<P class=MsoNormal><SPAN style="FONT-SIZE: 8pt; COLOR: #1f497d; FONT-FAMILY: 'Arial','sans-serif'">Direct: 703. 834.2438</SPAN><o:p></o:p></P>
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<P class=MsoNormal><B><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <B>On Behalf Of </B>James Hansen<BR><B>Sent:</B> Wednesday, December 10, 2008 11:40 AM<BR><B>To:</B> equest-users@lists.onebuilding.org<BR><B>Subject:</B> [Equest-users] Number of systems required by 90.1?</SPAN><o:p></o:p></P></DIV></DIV>
<P class=MsoNormal> <o:p></o:p></P>
<P class=MsoNormal>I’m working on a model of a 5-story building – my Proposed system is floor-by-floor chilled water AHUs connected to a water-cooled chiller central plan. Airside is shutoff VAV boxes with hot water reheat.<o:p></o:p></P>
<P class=MsoNormal> <o:p></o:p></P>
<P class=MsoNormal>For the size of the building, the baseline model is almost identical. It is System 7 – Packaged rooftop VAV system with reheat boxes, chilled water, hot water boilers.<o:p></o:p></P>
<P class=MsoNormal> <o:p></o:p></P>
<P class=MsoNormal>My question is whether or not the Baseline model has to have a single system for the building, or should it have 5 separate RTUs (doesn’t really make any sense) since my proposed building has 5 systems?<o:p></o:p></P>
<P class=MsoNormal> <o:p></o:p></P>
<P class=MsoNormal>I’m pretty sure the answer is that the Baseline should just have one packaged RTU for the building, but it actually makes a big difference on energy use. By breaking the systems down into one-per-floor, as is the case with the proposed model, I end up saving a LOT of energy, possibly because the 1<SUP>st</SUP> floor is slab-on-grade, and the 5<SUP>th</SUP> floor has a roof. <o:p></o:p></P>
<P class=MsoNormal> <o:p></o:p></P>
<P class=MsoNormal>Just wanted to make sure I have the correct number of “systems” for the Baseline model.<o:p></o:p></P>
<P class=MsoNormal> <o:p></o:p></P>
<P class=MsoNormal>Thanks!<o:p></o:p></P>
<P class=MsoNormal> <o:p></o:p></P>
<P class=MsoNormal><B><SPAN style="FONT-SIZE: 12pt; COLOR: teal; FONT-FAMILY: 'Arial','sans-serif'">GHT Limited<BR></SPAN></B><B><SPAN style="COLOR: black; FONT-FAMILY: 'Arial','sans-serif'">James Hansen</SPAN></B><B><SPAN style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 'Times New Roman','serif'">, PE, LEED AP</SPAN></B><o:p></o:p></P>
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<P class=MsoNormal><SPAN style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 'Arial','sans-serif'">1010 N. Glebe Rd, Suite 200</SPAN><o:p></o:p></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 'Arial','sans-serif'">Arlington, VA 22201-4749</SPAN><o:p></o:p></P>
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