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<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=941254400-13032007>Hi
all</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=941254400-13032007></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=941254400-13032007>I am
using eQuest to try to model a Passive Chilled Beam system using a Dummy OA zone
of SZRH and Fan Coil Units in the zones.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=941254400-13032007>I
specified the Dummy zone for only OA treatment without any internal loads, and
set COOL-CONTROL as CONSTANT, </SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=941254400-13032007>COOL-SET-T as 59 oF(15oC). Because CB won't kick in
untill the room temperature is above 15oC with AHU.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=941254400-13032007>There
is one AHU for the Dummy zone.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=941254400-13032007>Then
for all the actual zones, I specified FC with OA-FROM-SYSTEM as dummy
zone.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=941254400-13032007>There
is a sparated loop (chilled water temperature of 14oC supply and 17oC
return) defined for the FC.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=941254400-13032007>As my
understanding you can remove the Fan energy of FC then the energy consumption of
FC will represent the actual loads for passive chilled beam. And the Dummy OA
zone of SZRH will deal with constant OA load. </SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=941254400-13032007>Am I
right, anything I missed for the assuption.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=941254400-13032007>My
problems are:</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=941254400-13032007>1)
warning message in SIM file saying "Preheat/heating-capacity is too low to
provide the requested supply temperature for the </SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=941254400-13032007> calculated mixed air temperature...".
Although I used auto sizing for the heating capacity.<BR>2) What is the
different impact if I specify the actual zones as FC from
IU. </SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=941254400-13032007>3) I
did some test runs of FC and IU. The results indicated heating energy
consumption of IU was 10 times as FC.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=941254400-13032007>4) The
test run of passive chilled beam shows the cooling and heat rejection energy
goes 50%, pump goes 25% up </SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=941254400-13032007> than the conventional VAV. And Fan
became only 20% of the conventional VAV. </SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=941254400-13032007> The result is quite different from
my expectation and some reference. I am expecting similar cooling and heat
rejection figure but </SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=941254400-13032007> apporx 150% of pump, 50% of fan
energy than the conventional VAV.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=941254400-13032007>Any
comments would be appreciated.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=941254400-13032007>Thank
you in advance.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=941254400-13032007></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=941254400-13032007>Kind
Regards,</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=941254400-13032007>Vickie</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=941254400-13032007></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=941254400-13032007></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=941254400-13032007> </SPAN></FONT></DIV><pre>____________________________________________________________
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