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<DIV><FONT face=Arial size=2>Assuming you are using EQuest based software
you will have difficulty getting this set up the way you want. TAS, Apache
and I suspect TRNSYS and ESP will allow you to set this up the way you want on
the airside.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>With EQuest, if you can accept a constant off-coil
temperature from your OA unit then set it up this way to guarantee humidity
control, even reheat it to say 15C for a chilled beam system using a CW heat
recovery coil and then pass this air to your main system using
OA-FROM-SYSTEM. I have done this and checked hourly reports throughly - it
works.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>The problems arise if you want to control your OA
unit off-coil temperature on space humidity. You will never get this just
righ but you can try some approximations by setting the OA unit SAT on an
outdoor air reset schedule and tune the reset parameters to get your space
humidity levels where you want - iteratively lookign at hourly reports or
possibly system humidity reports.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>EQuest / DOE-2.2 are brilliant simulation tools
that we enjoy for free. I have been trying unsuccessfully in
Australia to raise $ to get a few simple fixes made to the IU system humidity
and heating controls that other systems with dewpoint control may also benefit
from. </FONT><FONT face=Arial size=2>If anyone can see the value of making
a financial contribution to enable Jeff Hirsch and his team to add more
functionality in this area please contact Jeff or I.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Regards,</FONT></DIV>
<DIV><FONT face=Arial size=2>Graham</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=thulasiguptha@yahoo.com href="mailto:thulasiguptha@yahoo.com">thulasi
guptha</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=BLDG-SIM@GARD.COM
href="mailto:BLDG-SIM@GARD.COM">BLDG-SIM@GARD.COM</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, August 31, 2006 11:44
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [BLDG-SIM] Dedicated outside air
system with total heat recovery+separate VAV for cooling</DIV>
<DIV><BR></DIV>Hi all,<BR><BR>I am trying to model a dedicated outside air
system with total heat recovery+demand controlled ventilation control and a
separate VAV unit for cooling. The space needs to be maintained at 50%
relative humidity. Any help will be greatly appreciated.
<BR><BR>Thanks<BR>Thulasi<BR>
<P>
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