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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Greetings:<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 think I’ve wrestled with this long enough and it’s
time to invoke the collection of greater minds on this list service for help. <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 am using eQUEST models to compare scenarios and I find
that changing from a fan-coil system (two-pipe) to a PTAC system (with HW coil heating
using the same two-pipe loop) causes a 3 fold increase in ventilation fan
energy for this system. This is distorting the energy use projections
between these two scenarios.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Is there a logical explanation for this? I have run a
number of parametrics to try to isolate the cause for the difference in Vent
Fan energy. The fan power parameters are the same. Fan control and
flow parameters appear to be consistent. The systems take outdoor air
from another system and the Vent Fan energy does not appreciably change for
that system. For the real world, I would not expect to see a huge change
in fan energy if I change the cooling source from a chilled water coil to a refrigerant
coil. What is happening in the model that I don’t understand?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Many thanks in advance to all who are able to give time and
wisdom to this.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=DE style='font-size:10.0pt;
font-family:Arial'>Ken<o:p></o:p></span></font></p>
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<p class=MsoNormal style='mso-margin-top-alt:6.0pt;margin-right:0in;margin-bottom:
3.0pt;margin-left:0in;mso-margin-top-alt:.5gd;mso-para-margin-right:0in;
mso-para-margin-bottom:.25gd;mso-para-margin-left:0in'><font size=2 color=navy
face=Arial><span lang=DE style='font-size:10.0pt;font-family:Arial;color:navy'>Ken
Neuhauser, M.Arch, MSc.Arch, LEED AP<o:p></o:p></span></font></p>
<p class=MsoNormal><i><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy;font-style:italic'>Architectural
Project Manager<o:p></o:p></span></font></i></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Conservation Services Group, Inc.<o:p></o:p></span></font></p>
<p class=MsoNormal><u1:Street u2:st="on"><u1:address u2:st="on"><st1:Street
w:st="on"><st1:address w:st="on"><font size=1 color=navy face=Arial><span
style='font-size:9.0pt;font-family:Arial;color:navy'>40 Washington Street</span></font></st1:address></st1:Street><font
size=1 color=navy face=Arial><span style='font-size:9.0pt;font-family:Arial;
color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal></u1:address></u1:Street><u1:place u2:st="on"><u1:City u2:st="on"><st1:place
w:st="on"><st1:City w:st="on"><font size=1 color=navy face=Arial><span
style='font-size:9.0pt;font-family:Arial;color:navy'>Westborough</u1:City></span></font></st1:City><font
size=1 color=navy face=Arial><span style='font-size:9.0pt;font-family:Arial;
color:navy'>, <u1:State u2:st="on"><st1:State w:st="on">MA</u1:State></st1:State>
<u1:PostalCode u2:st="on"><st1:PostalCode w:st="on">01581</u1:PostalCode></st1:PostalCode></span></font></st1:place><font
size=1 color=navy face=Arial><span style='font-size:9.0pt;font-family:Arial;
color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=navy face=Arial><span style='font-size:
9.0pt;font-family:Arial;color:navy'></st1:place>Ph. 508 836-9500 ext. 13226<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=navy face=Arial><span style='font-size:
9.0pt;font-family:Arial;color:navy'>Fax 508 836-3181<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=navy face=Arial><span style='font-size:
9.0pt;font-family:Arial;color:navy'><a href="http://www.csgrp.com/">www.csgrp.com</a> <o:p></o:p></span></font></p>
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