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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Well, it is a little weird, but create 2
HVAC systems, like packaged single zones, and attach them to two spaces that don’t
mind having some possibly odd space temperatures, like mechanical rooms. The
first HVAC unit uses heat recovery and heats/cools OSA and develops a space
temperature and humidity profile. Feed that space air into the second HVAC unit
via the Outside Air from System and further heat/cool (heat recovery won’t
work at this point, I think) to create tempered, dry air to feed to all the
building terminal units. Sometimes you have to get creative with equipment that
heats and cools, like using a magic no energy consumption electric boiler to represent
the hot gas bypass portion of a DX cooling unit, but as long as the resulting space
temperature and humidity profiles make sense, and you keep track of the power
consumed, I figure the work around is close enough.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>It seems to work.<o:p></o:p></span></font></p>
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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'> Bishop, Bill
[mailto:bbishop@pathfinder-ea.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, December 13, 2013
9:03 AM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">Kathryn
Kerns</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [Equest-users] Add-On
Desiccant for simulating passivedehumidification wheel?</span></font><font
size=3 face="Times New Roman"><span style='font-size:12.0pt;font-family:"Times New Roman"'><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'>Thanks! I assume I’m not the only
one who would be curious how you model two DOAS in series?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></font></p>
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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'> <st1:PersonName
w:st="on">Kathryn Kerns</st1:PersonName>
[mailto:kathryn.kerns@bceengineers.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, December 13, 2013
12:01 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Bishop, Bill; <st1:PersonName
w:st="on">equest-users@lists.onebuilding.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [Equest-users] Add-On
Desiccant for simulating passivedehumidification wheel?<o:p></o:p></span></font></p>
</div>
</div>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I remember talking to James Hirsch about
the desiccant pre-conditioner software and he warned me that the software was
never officially verified as functional for all design conditions. I steered
clear of those subprograms after that and started experimenting with adding two
DOAs in series to simulate dehumidification control. I don’t know if that
solution is really any better, but it seemed to work, and at least used
subprograms I was sure functioned.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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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'> <a
href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>
[<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>]
<b><span style='font-weight:bold'>On Behalf Of </span></b>Bishop, Bill<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, December 13, 2013
8:38 AM<br>
<b><span style='font-weight:bold'>To:</span></b> <a
href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b><span style='font-weight:bold'>Subject:</span></b> [Equest-users] Add-On
Desiccant for simulating passivedehumidification wheel?</span></font><font
size=3 face="Times New Roman"><span style='font-size:12.0pt;font-family:"Times New Roman"'><o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Any
thoughts on using a System -> Preconditioner -> Add-On Desiccant for
modeling a passive dehumidification wheel in the configuration shown below?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>It
would be a workaround. One problem I see is the Add-On Desiccant doesn’t
interact with the return air. You would have to derate the total energy wheel
somehow, such as by reducing the effectiveness or decreasing the exhaust
airflow.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><img
border=0 width=460 height=290 id="Picture_x005f_x005f_x005f_x0020_1"
src="cid:image001.jpg@01CEF7E5.11EF25E0"><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Thanks,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Bill<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><st1:place w:st="on"><st1:City w:st="on"><b><font size=2
color=black face="Franklin Gothic Medium"><span style='font-size:10.0pt;
font-family:"Franklin Gothic Medium";color:black;font-weight:bold'>William</span></font></b></st1:City><b><font
size=2 color=black face="Franklin Gothic Medium"><span style='font-size:10.0pt;
font-family:"Franklin Gothic Medium";color:black;font-weight:bold'> <st1:State
w:st="on">Bishop</st1:State>, <st1:State w:st="on">PE</st1:State></span></font></b></st1:place><b><font
size=2 color=black face="Franklin Gothic Medium"><span style='font-size:10.0pt;
font-family:"Franklin Gothic Medium";color:black;font-weight:bold'>, BEMP,
BEAP, LEED AP </span></font></b><b><font size=2 color="#006600"
face="Franklin Gothic Medium"><span style='font-size:10.0pt;font-family:"Franklin Gothic Medium";
color:#006600;font-weight:bold'>|</span></font></b><b><font size=2 color=black
face="Franklin Gothic Medium"><span style='font-size:10.0pt;font-family:"Franklin Gothic Medium";
color:black;font-weight:bold'> Pathfinder Engineers & Architects LLP<o:p></o:p></span></font></b></p>
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<p class=MsoNormal><b><font size=1 color=black face=Arial><span
style='font-size:9.0pt;font-family:Arial;color:black;font-weight:bold'>Senior
Energy Engineer<o:p></o:p></span></font></b></p>
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src="cid:image002.jpg@01CEF7E5.11EF25E0"
alt="webCertified_logo_colorRGB72DPI.jpg"><o:p></o:p></span></font></p>
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style='font-size:5.0pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><st1:address w:st="on"><st1:Street w:st="on"><font size=1
color="#1f497d" face=Arial><span style='font-size:9.0pt;font-family:Arial;
color:#1F497D'>134 South Fitzhugh Street</span></font></st1:Street><font
size=1 color="#1f497d" face="Times New Roman"><span style='font-size:9.0pt;
font-family:"Times New Roman";color:#1F497D'>
</span></font><st1:City w:st="on"><font size=1 color="#1f497d" face=Arial><span
style='font-size:9.0pt;font-family:Arial;color:#1F497D'>Rochester</span></font></st1:City><font
size=1 color="#1f497d" face=Arial><span style='font-size:9.0pt;font-family:
Arial;color:#1F497D'>, <st1:State w:st="on">NY</st1:State> <st1:PostalCode
w:st="on">14608</st1:PostalCode></span></font></st1:address><font size=1
color="#1f497d" face=Arial><span style='font-size:9.0pt;font-family:Arial;
color:#1F497D'><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=1 color="#1f497d" face=Arial><span
style='font-size:9.0pt;font-family:Arial;color:#1F497D'>T: (585) 325-6004 </span></font><font
size=1 color=black face=Arial><span style='font-size:9.0pt;font-family:Arial;
color:black'>Ext. 114</span></font><font size=3 color="#1f497d"
face="Times New Roman"><span style='font-size:12.0pt;font-family:"Times New Roman";
color:#1F497D'>
</span></font><font size=1 color="#1f497d" face=Arial><span style='font-size:
9.0pt;font-family:Arial;color:#1F497D'>F: (585) 325-6005</span></font><font
size=1 color=black face=Arial><span style='font-size:9.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><a
href="mailto:wbishop@pathfinder-ea.com"><font size=1 face=Arial><span
style='font-size:9.0pt;font-family:Arial'>bbishop@pathfinder-ea.com</span></font></a></span></font><font
size=1 color=black face=Arial><span style='font-size:9.0pt;font-family:Arial;
color:black'> </span></font><a
href="http://www.pathfinder-ea.com/"><font size=1 face=Arial><span
style='font-size:9.0pt;font-family:Arial'>www.pathfinder-ea.com</span></font></a><font
size=1 color=black face=Arial><span style='font-size:9.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=4 color=green face=Webdings><span
style='font-size:14.0pt;font-family:Webdings;color:green'>P</span></font><font
size=4 color=green face="Times New Roman"><span style='font-size:14.0pt;
font-family:"Times New Roman";color:green'> </span></font><font
size=1 color=green face="Times New Roman"><span style='font-size:7.5pt;
font-family:"Times New Roman";color:green'>Sustainability – the forest
AND the trees.</span></font><font size=5 color=green face=Webdings><span
style='font-size:18.0pt;font-family:Webdings;color:green'> </span></font><font
size=4 color=green face=Webdings><span style='font-size:14.0pt;font-family:
Webdings;color:green'>P</span></font><font size=4 color=green><span
style='font-size:14.0pt;color:green'> </span></font><font
size=4 color=green face=Webdings><span style='font-size:14.0pt;font-family:
Webdings;color:green'> </span></font><font color="#1f497d"><span
style='color:#1F497D'><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
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