<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML>
<HEAD>
<META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7638.1">
<TITLE>[BLDG-SIM] Radiant Slabs in eQUEST and LEED</TITLE>
</HEAD>
<BODY>
<DIV id=idOWAReplyText56673 dir=ltr>
<DIV dir=ltr><FONT face=Arial color=#000000 size=2>I dont think you have modeled
a radiant floor before? If so you wouldnt use your
suggestions.</FONT></DIV></DIV>
<DIV dir=ltr><BR>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> BLDG-SIM@gard.com on behalf of Karen
Walkerman<BR><B>Sent:</B> Tue 11/20/2007 5:31 AM<BR><B>To:</B>
BLDG-SIM@gard.com<BR><B>Cc:</B> BLDG-SIM@gard.com<BR><B>Subject:</B> [BLDG-SIM]
Radiant Slabs in eQUEST and LEED<BR></FONT><BR></DIV>
<DIV>
<P><FONT size=2>If four-pipe fan coils are used, with fan energy turned off (or
down,<BR>to mimic circulator energy), then fan power for ventilation air is
not<BR>included. I have two ideas:<BR><BR>1. Specify an energy
recovery ventilator, with effectiveness of 0%,<BR>and appropriate pressure drops
to account for ventilation air fan<BR>power. I have not tried this, but it
might work<BR><BR>2. Use an airside system, and model radiators in the
space. Remember<BR>to input the panel capacity at the room level!
Adjust the dT and<BR>pressure drop to simulate the radiant floor. Also, as
mentioned<BR>before, lower the setpoint temperature to 68F. Depending on
the<BR>radiant floor system used, you might want to include thermal mass
in<BR>the space. This method allows you to use whatever cooling method
and<BR>OA handling method you choose.<BR><BR>If anyone tries #1, let me
know!<BR><BR>~karen~<BR><BR>On Nov 19, 2007 5:30 PM, Vikram Sami
<VSami@lasarchitect.com> wrote:<BR>><BR>><BR>><BR>> I'm doing
an ECB documentation for a LEED 2.1 project using eQUEST. Around<BR>> half of
the building uses hydronic radiant floor heating. I am trying to<BR>> model
this in eQUEST.<BR>><BR>> From past threads, suggestions I have come
across are:<BR>> 1. Lower the Space temperature to 68F.<BR>> 2. Using the
FPH system in eQUEST. This doesn't allow for cooling however,<BR>> and uses
no fans (we still have air supply in our building).<BR>><BR>> 3. Andrew
Craig suggested inputting the capacity of the radiant system as an<BR>>
internal energy source. (This is great because it allows the fans to
cycle<BR>> on/off and maintains the cooling side. It doesn't calculate
heating loads on<BR>> the radiant slab though)<BR>><BR>> What I plan to
do is use the FPH system and setback the thermostat to 68F in<BR>> these
spaces. This will allow me to calculate the heating energy on the<BR>>
radiant coil. I then plan to use Andrew's "internal energy source" method
to<BR>> calculate the airside system loads, and add the FPH heat load to
that.<BR>><BR>> Does this seem like a reasonable method to model
this?<BR>><BR>> Vikram Sami, LEED AP<BR>> Direct Phone 404-253-1466 |
Direct Fax 404-253-1366<BR>><BR>> LORD, AECK & SARGENT
ARCHITECTURE<BR>> 1201 Peachtree Street NE, Suite 300, Atlanta, GA
30361<BR>> Responsive Design · Technological Expertise · Exceptional
Service<BR>> www.lordaecksargent.com<BR>><BR>> Please don't print this
email unless you really have to.<BR>> One tree makes 16.67 reams of copy
paper or 8,333.3 sheets<BR>> ~Conservatree, September
2002<BR>><BR>><BR>><BR>> You received this e-mail because you are
subscribed<BR>> to the BLDG-SIM@GARD.COM mailing list. To unsubscribe<BR>>
from this mailing list send a blank message to<BR>>
BLDG-SIM-UNSUBSCRIBE@GARD.COM<BR>><BR>><BR><BR><BR><BR>--<BR>Karen
Walkerman<BR>Second Law Consulting<BR><BR>==================<BR>You received
this e-mail because you are subscribed<BR>to the BLDG-SIM@GARD.COM mailing
list. To unsubscribe<BR>from this mailing list send a blank message
to<BR>BLDG-SIM-UNSUBSCRIBE@GARD.COM<BR><BR></FONT></P></DIV>
<PRE>
===========================
You received this e-mail because you are subscribed
to the BLDG-SIM@GARD.COM mailing list. To unsubscribe
from this mailing list send a blank message to
BLDG-SIM-UNSUBSCRIBE@GARD.COM
</PRE></BODY>
</HTML>