<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><DIV>Quick take, as I haven't look at your runs. But setting the Thermostat to Reverse Action and having a throttling range of 4 - 6 DegF (Forget the R they have displayed). That should knock down your unmet hours, and maybe your fan.</DIV>
<DIV> </DIV>
<DIV>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN style="COLOR: #1f497d; mso-fareast-font-family: 'Times New Roman'; mso-fareast-theme-font: minor-fareast; mso-no-proof: yes"><FONT face=Calibri>John R. Aulbach, PE, CEM<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></FONT></SPAN></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN style="COLOR: #1f497d; mso-fareast-font-family: 'Times New Roman'; mso-fareast-theme-font: minor-fareast; mso-no-proof: yes"><FONT face=Calibri>Senior Energy Engineer<o:p></o:p></FONT></SPAN></P>
<DIV style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN style="COLOR: #17365d; mso-fareast-font-family: 'Times New Roman'; mso-no-proof: yes"><FONT face=Calibri>
<HR style="COLOR: #17365d" align=left SIZE=2 width="30%" noShade>
</FONT></SPAN></DIV>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><FONT face=Calibri><B><SPAN style="FONT-VARIANT: small-caps; COLOR: navy; mso-fareast-font-family: 'Times New Roman'; mso-fareast-theme-font: minor-fareast; mso-no-proof: yes">Partner</SPAN></B><B><SPAN style="FONT-VARIANT: small-caps; COLOR: green; mso-fareast-font-family: 'Times New Roman'; mso-fareast-theme-font: minor-fareast; mso-no-proof: yes"> </SPAN></B><B><SPAN style="FONT-VARIANT: small-caps; COLOR: #006600; mso-fareast-font-family: 'Times New Roman'; mso-fareast-theme-font: minor-fareast; mso-no-proof: yes">Energy</SPAN><SPAN style="FONT-VARIANT: small-caps; COLOR: navy; mso-no-proof: yes"><o:p></o:p></SPAN></B></FONT></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN style="COLOR: #1f497d; mso-fareast-font-family: 'Times New Roman'; mso-fareast-theme-font: minor-fareast; mso-no-proof: yes"><FONT face=Calibri>1990 E. Grand Avenue, El Segundo, CA 90245<BR>W: 888-826-1216, X254| D: 310-765-7295 | F: 310-817-2745<o:p></o:p></FONT></SPAN></P><SPAN style="FONT-FAMILY: 'Calibri','sans-serif'; FONT-SIZE: 11pt; mso-fareast-font-family: Calibri; mso-fareast-theme-font: minor-latin; mso-ascii-theme-font: minor-latin; mso-hansi-theme-font: minor-latin; mso-bidi-font-family: 'Times New Roman'; mso-bidi-theme-font: minor-bidi; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA"><A href="http://www.ptrenergy.com/"><SPAN style="mso-fareast-font-family: 'Times New Roman'; mso-fareast-theme-font: minor-fareast; mso-no-proof: yes"><FONT color=#0000ff>www.ptrenergy.com</FONT></SPAN></A></SPAN><SPAN style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR:
#1f497d; FONT-SIZE: 11pt; mso-fareast-font-family: 'Times New Roman'; mso-fareast-theme-font: minor-fareast; mso-no-proof: yes; mso-ascii-theme-font: minor-latin; mso-hansi-theme-font: minor-latin; mso-bidi-font-family: 'Times New Roman'; mso-bidi-theme-font: minor-bidi; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA"> </SPAN><SPAN style="FONT-FAMILY: 'Calibri','sans-serif'; FONT-SIZE: 11pt; mso-fareast-font-family: Calibri; mso-fareast-theme-font: minor-latin; mso-ascii-theme-font: minor-latin; mso-hansi-theme-font: minor-latin; mso-bidi-font-family: 'Times New Roman'; mso-bidi-theme-font: minor-bidi; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA"><A href="mailto:%7C%20jaulbach@ptrenergy.com"><SPAN style="mso-fareast-font-family: 'Times New Roman'; mso-fareast-theme-font: minor-fareast; mso-no-proof: yes"><FONT color=#0000ff>| jaulbach@ptrenergy.com</FONT></SPAN></A></SPAN><BR></DIV>
<DIV style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt"><BR>
<DIV style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt"><FONT size=2 face=Tahoma>
<HR SIZE=1>
<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Patrick O'Donnell <pco@MichaelsEngineering.com><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> equest-users@lists.onebuilding.org<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Thu, June 3, 2010 11:57:48 AM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> [Equest-users] High Cooling and Fan energy use VAV? Advice needed<BR></FONT><BR>
<P dir=ltr><SPAN lang=en-us><FONT face=Calibri>Hi all,</FONT></SPAN></P>
<P dir=ltr><SPAN lang=en-us><FONT face=Calibri>I</FONT></SPAN><SPAN lang=en-us> <FONT face=Calibri>am having a hard time getting this VAV system</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri></FONT></SPAN><SPAN lang=en-us> <FONT face=Calibri>to be efficient</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri>; more specifically</FONT></SPAN><SPAN lang=en-us><B> <FONT face=Calibri>the cooling and fan energy seems way too high</FONT></B></SPAN><SPAN lang=en-us><B><FONT face=Calibri></FONT></B></SPAN><SPAN lang=en-us> <FONT face=Calibri>and I cannot figure out why</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri>.</FONT></SPAN><SPAN lang=en-us> <FONT face=Calibri> This system serves a space</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri> in</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri> a</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri>n insulated</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri> built-out</FONT></SPAN><SPAN lang=en-us><FONT
face=Calibri> office space that is</FONT></SPAN><SPAN lang=en-us> <FONT face=Calibri>located</FONT></SPAN><SPAN lang=en-us> <FONT face=Calibri>within</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri> an insulated</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri> production space</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri>. The production space has heating only and</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri> generates some of its own internal loads. </FONT></SPAN><SPAN lang=en-us> </SPAN></P>
<P dir=ltr><SPAN lang=en-us></SPAN></P>
<P dir=ltr><SPAN lang=en-us><FONT face=Calibri>It is the office spaces that I am concerned with</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri></FONT></SPAN><SPAN lang=en-us> <FONT face=Calibri>(set on their own meters</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri> EM1</FONT></SPAN><SPAN lang=en-us> <FONT face=Calibri>and FM1 )</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri>. </FONT></SPAN><SPAN lang=en-us> <FONT face=Calibri>There is some load diversity i.e. some rooms have some significant equipment and occupant loads</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri></FONT></SPAN><SPAN lang=en-us> <FONT face=Calibri>while others do not.</FONT></SPAN><SPAN lang=en-us></SPAN></P>
<P dir=ltr><SPAN lang=en-us><FONT face=Symbol>·<FONT face="Courier New"> </FONT></FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us> <FONT face=Calibri>Cooling</FONT></SPAN><SPAN lang=en-us> <FONT face=Calibri>capacity seems reasonable</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri>(this system is auto sizing)</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri>, supply cfm seems normal.</FONT></SPAN><SPAN lang=en-us></SPAN></P>
<P dir=ltr><SPAN lang=en-us><FONT face=Symbol>·<FONT face="Courier New"> </FONT></FONT></SPAN><SPAN lang=en-us> <FONT face=Calibri>The fans are running whenever the system is on. </FONT></SPAN></P>
<P dir=ltr><SPAN lang=en-us><FONT face=Symbol>·<FONT face="Courier New"> </FONT></FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us> <FONT face=Calibri>Looking at the hourly reports,</FONT></SPAN><SPAN lang=en-us> <FONT face=Calibri>I think the economizer is working properly</FONT></SPAN><SPAN lang=en-us> <FONT face=Calibri>and modulating open for free cooling when OA temp is below the set</FONT></SPAN><SPAN lang=en-us> <FONT face=Calibri>threshold</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri>.</FONT></SPAN><SPAN lang=en-us></SPAN></P>
<P dir=ltr><SPAN lang=en-us><FONT face=Symbol>·<FONT face="Courier New"> </FONT></FONT></SPAN><SPAN lang=en-us> <FONT face=Calibri>Unmet load hours for cooling</FONT></SPAN><SPAN lang=en-us> <FONT face=Calibri>are</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri> also very high.</FONT></SPAN></P>
<P dir=ltr><SPAN lang=en-us><FONT face=Symbol>·<FONT face="Courier New"> </FONT></FONT></SPAN><SPAN lang=en-us> <FONT face=Calibri>Internal loading, occupancy, etc should be accurate</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri> however it should be noted that infiltration</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri> into the office spaces is intentionally set pretty high</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri> accounting for</FONT></SPAN><SPAN lang=en-us> <FONT face=Calibri>minimal sealing of spaces.</FONT></SPAN><SPAN lang=en-us></SPAN></P>
<P dir=ltr><SPAN lang=en-us></SPAN><SPAN lang=en-us></SPAN></P>
<P dir=ltr><SPAN lang=en-us><FONT face=Calibri>I think I have some of the controls</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri></FONT></SPAN><SPAN lang=en-us> <FONT face=Calibri>goofed up</FONT></SPAN><SPAN lang=en-us> <FONT face=Calibri>or scheduling conflicts</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri> but am not sure</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri>. Thank you very much in advance for any assistan</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri>ce/insight you can provide!!</FONT></SPAN><SPAN lang=en-us><FONT face=Calibri> Attached are the modeling files.</FONT></SPAN></P>
<P dir=ltr><SPAN lang=en-us></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us><FONT face=Calibri>-Patrick</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us></SPAN></P>
<P dir=ltr><SPAN lang=en-us></SPAN><SPAN lang=en-us></SPAN></P>
<P dir=ltr><SPAN lang=en-us></SPAN></P>
<P dir=ltr><SPAN lang=en-us></SPAN><SPAN lang=en-us><FONT color=#000000 size=2 face=Arial><<OfficeBuildout_VAV4.inp>> </FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us><FONT color=#000000 size=2 face=Arial><<OfficeBuildout_VAV4.pd2>> </FONT></SPAN><SPAN lang=en-us></SPAN></P>
<P dir=ltr><SPAN lang=en-us></SPAN><SPAN lang=en-us></SPAN></P>
<P dir=ltr><SPAN lang=en-us></SPAN></P></DIV></DIV></div><br>
</body></html>