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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I have been struggling with this scenario. A pump room
does not need to exceed 104F. <st1:place w:st="on">Lake</st1:place> water
is used for cooling. The room is expected to contain internal loads requiring
cooling at almost all times. Below 55F the OA and RA modulate to provide
55F supply air. Above 55F, 100% OA and the cooling coil turns on. I
have the cooling Tstat set to 90F and cooling coil available at 55F. I am
unsure how to even model Below 55F except for economizing which is not really exact
but when I set the economizing low limit to 55F I get 200F in the space.
I have set economizing to 90F integrated with the coil and no low limit. The
cooling coil is rarely used and not needed in its full capacity yet I am
getting inadequate cooling warnings. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The Min-Supply-T is set to 55F because supply should not be
less than this and hourly reports show acceptable supply temperatures into the
mid 70s (I don’t know if this is acceptable to the program?) I am
not using a lake water chiller because I am not trying to use the same coil
temperature. I am using a simple packaged single zone with the
cool-control range set to max and EIR zero’d because there is enough
force off the main header to not need any pumping through the loop.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>This is only for energy code compliance and I need an
explanation on the warnings. Other than stating several obvious
limitations I don’t really understand why this warning is occurring. Does
anyone have suggestions on how I may model this system?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I understand that electronic files would help and I will
work on that.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thank you.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoAutoSig><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Kevin Kyte, </span></font><font size=2><span style='font-size:10.0pt'>LEED</span></font><sup><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font></sup><sup><font
size=2><span style='font-size:10.0pt'>®</span></font></sup><font size=2><span
style='font-size:10.0pt'> AP<o:p></o:p></span></font></p>
<p class=MsoNormal><st1:place w:st="on"><b><font size=3 face="Times New Roman"><span
style='font-size:12.0pt;font-weight:bold'>Watts</span></font></b></st1:place><b><span
style='font-weight:bold'> Architecture & Engineering, P.C.<o:p></o:p></span></b></p>
<p class=MsoNormal><st1:Street w:st="on"><st1:address w:st="on"><font size=2
face=Shruti><span style='font-size:10.5pt;font-family:Shruti'>95 Perry
Street, Suite 300</span></font></st1:address></st1:Street><font size=2
face=Shruti><span style='font-size:10.5pt;font-family:Shruti'><o:p></o:p></span></font></p>
<p class=MsoNormal><st1:place w:st="on"><st1:City w:st="on"><font size=2
face=Shruti><span style='font-size:10.5pt;font-family:Shruti'>Buffalo</span></font></st1:City><font
size=2 face=Shruti><span style='font-size:10.5pt;font-family:Shruti'>, <st1:State
w:st="on">NY</st1:State> <st1:PostalCode w:st="on">14203</st1:PostalCode></span></font></st1:place><font
size=2 face=Shruti><span style='font-size:10.5pt;font-family:Shruti'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Shruti><span style='font-size:10.5pt;
font-family:Shruti'>p: 716.206.5174<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Shruti><span style='font-size:10.5pt;
font-family:Shruti'>f.: 716.206.5199<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Times New Roman"><span style='font-size:
11.0pt'>e: <a href="mailto:kkyte@watts-ae.com">kkyte@watts-ae.com</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Times New Roman"><span style='font-size:
11.0pt'><a href="http://www.watts-ae.com/">http://www.watts-ae.com</a><o:p></o:p></span></font></p>
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11.0pt'><o:p> </o:p></span></font></p>
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12.0pt'><o:p> </o:p></span></font></p>
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