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<DIV><FONT face=Arial size=2>In most of the projects that we have dealt with in
the Pacific Northwest, where there has been no cooling proposed and hence no
chiller in the central plant and the air handler includes only
hot water coils to tamper the outside air for
ventilation. </FONT><FONT face=Arial size=2>In these
situations, I have modeled a hydronic radiant floor heating using
a Unit Ventilator, by setting the fan power kw/cfm as 0.0000 and including
a baseboard at the zone level. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Moreover, as per LEED protocol one has to model
cooling even when no cooling has been proposed, i create a dummy zone
and assign a PSZ system with DX coils and hot water coils and
then in the outside air tab of the Unit Ventilator select the PSZ
system from the drop down list in 'Outside Air from
System'. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Since an FPH system doesn't allow outside air to be
simulated, would require some work around to account for the outside air loads
(which would be minimum ventilation required for IAQ) on the zone with
radiant floor heating. However, the approach described above takes into
account the outside air loads and also includes a cooling system that is similar
to the baseline system in most cases (PSZ-AC with DX coils for cooling). In
case, the central plant includes a chiller and/or baseline system
includes chilled water coils, I would use the Four Pipe FC.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Any thoughts on this approach?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thanks.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Gaurav Mehta,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Sustainable Building Analyst,</FONT></DIV>
<DIV><FONT face=Arial size=2>Stantec</FONT></DIV></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT><FONT face=Arial size=2></FONT> </DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=VSami@lasarchitect.com href="mailto:VSami@lasarchitect.com">Vikram
Sami</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> Monday, November 19, 2007
14:30</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [BLDG-SIM] Radiant Slabs in
eQUEST and LEED</DIV>
<DIV><BR></DIV><!-- Converted from text/rtf format -->
<P><FONT face=Arial size=2>I'm doing an ECB documentation for a LEED 2.1
project using eQUEST. Around half of the building uses hydronic radiant floor
heating. I am trying to model this in eQUEST. </FONT></P>
<P><FONT face=Arial size=2>From past threads, suggestions I have come across
are:</FONT> <BR><FONT face=Arial size=2>1. Lower the Space temperature to
68F.</FONT> <BR><FONT face=Arial size=2>2. Using the FPH system in eQUEST.
This doesn't allow for cooling however, and uses no fans (we still have air
supply in our building). </FONT></P>
<P><FONT face=Arial size=2>3. Andrew Craig suggested inputting the capacity of
the radiant system as an internal energy source. (This is great because it
allows the fans to cycle on/off and maintains the cooling side. It doesn't
calculate heating loads on the radiant slab though)</FONT></P>
<P><FONT face=Arial size=2>What I plan to do is use the FPH system and setback
the thermostat to 68F in these spaces. This will allow me to calculate the
heating energy on the radiant coil. I then plan to use Andrew's "internal
energy source" method to calculate the airside system loads, and add the FPH
heat load to that. </FONT></P>
<P><FONT face=Arial size=2>Does this seem like a reasonable method to model
this?</FONT> </P>
<P><B><FONT face=Garamond color=#000000>Vikram Sami,</FONT></B> <FONT
face=Garamond color=#000000>LEED AP</FONT><B></B> <BR><FONT face=Garamond
color=#000000>Direct Phone 404-253-1466 | Direct Fax 404-253-1366</FONT> </P>
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