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<p class=MsoNormal><font size=2 color=blue face=Calibri><span style='font-size:
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<p class=MsoNormal><font size=2 color=blue face=Calibri><span style='font-size:
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11.0pt;font-family:Calibri;color:blue'>Thanks!<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=1 color=blue face=Calibri><span style='font-size:
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Pasha
Korber-Gonzalez [mailto:pasha.pkconsulting@gmail.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, June 10, 2010
10:55 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Robert Des Rosiers<br>
<b><span style='font-weight:bold'>Cc:</span></b> equest-users@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Equest-users]
Excessive Unmet Heating Load Hours with anAuto-Sized HVAC System</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>I have found with my own projects that even sometimes when the HVAC
designer has specified a specific capacity for htg water equipment that
sometime in my model file I still have unmet loads for htg. I suggest at
this point specify additional htg capacity by either increasing the reheat
delta-T from say 30F to 50F and/or adding zone level baseboards. By
adding the baseboards you are adding a component of the system that will
supplement the skin losses being experienced by the simulation model.<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>by adding baseboards for the additional requrired heat then you should
be able to meet your heating loads.<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>hope this helps,<o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>pasha<o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>On Thu, Jun 10, 2010 at 7:38 PM, Robert Des Rosiers <<a
href="mailto:desrosiers@studioma.com">desrosiers@studioma.com</a>> wrote:<o:p></o:p></span></font></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>All:<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>I have completed
an energy model for a baseline scenario from which to compare my proposed
design. The baseline HVAC system is a constant volume single zone AHU w/
no reheat; the AHU is served by HW and CHW loop from a central plant. I
have set this up in eQuest as a "Variable Air Volume" system type
with the AHU fan control set to "Constant Volume"; my thought here is
that each zone fed by the AHU will control temperature using a VAV box w/ no
local reheat or cooling. Flow and temperature from the AHU will be
delivered based on the coolest or warmest zone it serves.<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>All seems fine
with the design flows, ventilation flows and cooling capacities. My
problem is with the heating capacity as I have excessive unmet heating hours
(50,000). I have allowed eQuest to size the heating capacity of the
preheat and heating coil as well as the minimum flow ratios. <u>Does
anyone have any thoughts as to what is causing these unmet heating load
hours? Is the way I have set-up the desired baseline HVAC system incorrect?</u><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>Any guidance is
greatly appreciated. Thanks -<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 color="#1f497d" face="Times New Roman"><span style='font-size:12.0pt;
color:#1F497D'>Robert Des Rosiers, LEED-AP</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><font
size=3 color="#1f497d" face="Times New Roman"><span style='font-size:12.0pt;
color:#1F497D;font-weight:bold'>STUDIO MA</span></font></b><o:p></o:p></p>
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<st1:State w:st="on">Arizona</st1:State> <st1:PostalCode w:st="on">85004</st1:PostalCode></st1:place></span></font><o:p></o:p></p>
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size=3 color="#1f497d" face="Times New Roman"><span style='font-size:12.0pt;
color:#1F497D'>Telephone 602 251 3800</span></font><o:p></o:p></p>
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