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<TITLE>High Cooling and Fan energy use VAV? Advice needed</TITLE>
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<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>
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<P DIR=LTR><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT FACE="Arial" SIZE=2 COLOR="#000000"> <<OfficeBuildout_VAV4.inp>> </FONT></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"></SPAN><SPAN LANG="en-us"><FONT FACE="Arial" SIZE=2 COLOR="#000000"> <<OfficeBuildout_VAV4.pd2>> </FONT></SPAN><SPAN LANG="en-us"></SPAN></P>
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