Hi Kathryn,<br><br>Just a couple of quick thoughts. Do you need to physically specify 2 DOAS units? Could you just specify one with an ERV and with the entering conditions of the first unit and the leaving conditions of the second unit? I'm not thinking of any downside to doing it that way but I'm not deep in it like you are. Let me know what you think.<br>
<br>Cheers,<br><br>Carol<br><br><div class="gmail_quote">On Mon, Oct 18, 2010 at 2:06 PM, Kathryn Kerns <span dir="ltr"><<a href="mailto:kathryn.kerns@bceengineers.com">kathryn.kerns@bceengineers.com</a>></span> wrote:<br>
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<p class="MsoNormal"><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">Has anyone ever tried to model 2 DOAS units in series? I have
successfully modeled a single DOAS/multiple fan coil system, but I have never
tried to string two DOAS units together by feeding the supply air output of the
first DOAS into the outside air input of the second DOAS. The reason I ask is
that I am looking for a way to model a DOAS that has an ERV device located downstream
after a heating and a cooling coil. Does anyone know whether DOE-2 would
treat the system exhaust air coming back through the second DOAS ERV any
differently than the exhaust air going back through a single DOAS with an ERV
unit? </span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">Assuming that this works, does anybody know how to add heat
to, or manually raise the temperature of, the ERV exhaust air? </span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">I am thinking if I can model a multiple DOAS with an
elevated exhaust temperature, I might be able to mimic a desiccant system. According
to James Hirsch in California,
the energy balance used in the desiccant tabs is not correct and should not be
used, so I am out of luck there.</span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">If anyone has another method for modeling a desiccant
system, I would love to hear from you.</span></font></p>
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<p style="margin: 0in 0in 0.0001pt;"><b><b><font color="black" face="Arial" size="3"><span style="font-size: 12pt; font-family: Arial; color: black;">Kathryn Kerns</span></font></b></b></p>
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